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Cook County, Illinois

Coordinates: 41°48′31″N 87°53′20″W / 41.80861°N 87.88889°W / 41.80861; -87.88889
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Cook County
County
From top, left to right: Cook County Circuit Court at Daley Center with Chicago Picasso, Frank Lloyd Wright Home and Studio, Forest Preserve District, aerial view of downtown Chicago, aerial view of Evanston, Montrose Avenue Beach in Chicago
Flag of Cook County
Flag
Official seal of Cook County
Seal
Location within Illinois
Location within Illinois
Illinois' location within the United States
Illinois' location within the United States
Coordinates: 41°48′31″N 87°53′20″W / 41.80861°N 87.88889°W / 41.80861; -87.88889
CountryUnited States
StateIllinois
RegionNorthern Illinois
Metro areaChicago metropolitan area
IncorporatedJanuary 15, 1831; 193 years ago (1831-01-15)
Named forDaniel Pope Cook
County seatChicago
Incorporated municipalities
135 (total)
  • 23 cities, 1 town, 111 villages
  • (located entirely or partially
    within county boundaries)
Government
 • TypeCounty commission
 • BodyBoard of Commissioners
 • PresidentToni R. Preckwinkle (D)
Area
 • County
1,635 sq mi (4,230 km2)
 • Land945 sq mi (2,450 km2)
 • Water690 sq mi (1,800 km2)
 • Metro
10,874 sq mi (28,160 km2)
 • Rank6th largest county in Illinois
Highest elevation
[1][2]
950 ft (290 m)
Lowest elevation
[1][3]
580 ft (180 m)
Population
 (2020)
 • County
5,275,541
 • Estimate 
(2023)
5,087,072 Decrease
 • Density3,200/sq mi (1,200/km2)
GDP
[4]
 • County$485.547 billion (2022)
Time zoneUTC−6 (Central)
 • Summer (DST)UTC−5 (Central)
ZIP Code prefixes
600xx–608xx
Area codes847/224, 312/872, 773/872, 708/464
FIPS code17-031
GNIS feature ID1784766
Congressional districts1st, 2nd, 3rd, 4th, 5th, 6th, 7th, 8th, 9th, 10th, 11th
Websitewww.cookcountyil.gov

Cook County is the most populous county in the U.S. state of Illinois and the second-most-populous county in the United States, after Los Angeles County, California. More than 40 percent of all residents of Illinois live within Cook County. As of 2020, the population was 5,275,541. The county seat is Chicago, the most populous city in Illinois and the third most populous city in the United States. The county is at the center of the Chicago metropolitan area.

Cook County was incorporated in 1831 and named for Daniel Pope Cook, an early Illinois statesman. It achieved its present boundaries in 1839. Within a century, the county recorded explosive population growth, going from a trading post village with a little over six hundred residents to four million, rivaling Paris by the Great Depression. During the first half of the 20th century it had the absolute majority of Illinois's population.

There are more than 800 local governmental units and nearly 130 municipalities located wholly or partially within Cook County, the largest of which is Chicago. The city is home to approximately 54 percent of the entire county's population.[5] The part of the county outside of the Chicago and Evanston city limits is divided into 29 townships; these often divide or share governmental services with local municipalities. Townships within Chicago were abolished in 1902 but are retained for real estate assessment purposes. Evanston Township was formerly coterminous with the City of Evanston but was abolished in 2014. County government is overseen by the Cook County Board of Commissioners, with its president as chief executive, and Cook County Treasurer. Countywide state government offices include the Circuit Court of Cook County, the Cook County State's Attorney, the Cook County Sheriff, and the Cook County Assessor.

Geographically, the county is the sixth-largest in Illinois by land area and the largest by total area. It shares the state's Lake Michigan shoreline with Lake County. Including its lake area, Cook County has a total area of 1,635 square miles (4,234.6 km2), the largest county in Illinois, of which 945 square miles (2,447.5 km2) is land and 690 square miles (1,787.1 km2) (42.16%) is water. Land-use in Cook County is mostly urban and densely populated. Within Cook County, the state of Illinois took advantage of its Lake Michigan access and the Chicago Portage, beginning with the construction of the Illinois and Michigan Canal in 1848. This helped make the region a central transit hub for the nation. Chicago, with its location on the Great Lakes and via the St. Lawrence Seaway, is a global port city, giving Cook County an international shipping port.

Cook County's population is larger than that of 28 U.S. states and territories, and larger than the population of 11 of the 13 Canadian provinces and territories.[6] Cook County is at the center of the Chicago metropolitan area, which has a population of approximately 10 million people.

History

[edit]

Cook County was created on January 15, 1831, out of Putnam County by an act of the Illinois General Assembly. It was the 54th county established in Illinois and was named after Daniel Pope Cook, one of the earliest and youngest statesmen in Illinois history. He served as the second U.S. representative from Illinois and the state's first attorney general. In 1839, DuPage County was carved out of Cook County.

  • Cook County from 1831 to 1836
    Cook County from 1831 to 1836
  • Cook County 1836–1839 after the creation of McHenry and Will counties
    Cook County 1836–1839 after the creation of McHenry and Will counties
  • Cook County's current size was formed in 1839 by the creation of DuPage County
    Cook County's current size was formed in 1839 by the creation of DuPage County

The shape of Cook County and the neighboring counties has remained the same since DuPage County was formed. The population in each county and the split of agriculture compared to residential and industrial activity has changed dramatically over the intervening decades to 2020. The county began with 10,201 people in the census of 1840, growing rapidly to 5,150,233 people estimated for 2019 by the US census. Growth was rapid in the 19th century, with the County reaching 2.4 million people by 1910. In the 20th century, the County reached 5.1 million population.

Cook County is nearly completely developed, with little agricultural land remaining near the outer county boundaries.[7]

Demographics

[edit]
Historical population
CensusPop.Note%±
184010,201—
185043,385325.3%
1860144,954234.1%
1870349,966141.4%
1880607,52473.6%
18901,191,92296.2%
19001,838,73554.3%
19102,405,23330.8%
19203,053,01726.9%
19303,982,12330.4%
19404,063,3422.0%
19504,508,79211.0%
19605,129,72513.8%
19705,492,3697.1%
19805,253,655−4.3%
19905,105,067−2.8%
20005,376,7415.3%
20105,194,675−3.4%
20205,275,5411.6%
2023 (est.)5,087,072[8]−3.6%
U.S. Decennial Census[9]
1790–1960[10] 1900–1990[11]
1990–2000[12] 2010–2019[13]

According to the 2000 Census there were 1,974,181 households, out of which 30.9% had children under the age of 18 living with them, 44.0% were married couples living together, 15.6% had a female householder with no husband present, and 35.7% were non-families. 29.4% of all households were someone living alone including 9.3% who were 65 years of age or older. The average household size was 2.68 and the average family size was 3.38.

Ethnic origins in Cook County
2000 census age pyramid for Cook County

In the county, the population age distribution was: 26.0% under the age of 18, 9.9% from 18 to 24, 31.7% from 25 to 44, 20.7% from 45 to 64, and 11.7% who were 65 years of age or older. The median age was 34 years. For every 100 females, there were 93.9 males. For every 100 females age 18 and over, there were 90.5 males.

The median income for a household in the county was $45,922, and the median income for a family was $53,784. Males had a median income of $40,690 versus $31,298 for females. The per capita income for the county was $23,227. About 10.6% of families and 13.5% of the population were below the poverty line, including 18.9% of those under age 18 and 10.3% of those age 65 or over.

As of the fourth quarter of 2021, the median home value in Cook County was $299,571, an increase of 11.7% from the prior year.[14]

According to Census Bureau estimates, the county's population grew by 5.3% from 1990 to 2000, decreased by 3.4% between the 2000 census and the 2010 census, and increased 1.6% between 2010 and 2020.

Race/ethnicity

[edit]
Cook County, Illinois – Racial and ethnic composition
Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos may be of any race.
Race / Ethnicity (NH = Non-Hispanic) Pop 2000[15] Pop 2010[16] Pop 2020[17] % 2000 % 2010 % 2020
White alone (NH) 2,558,709 2,278,358 2,135,243 47.59% 43.86% 40.47%
Black or African American alone (NH) 1,390,448 1,265,778 1,185,601 25.86% 24.37% 22.47%
Native American or Alaska Native alone (NH) 6,754 6,682 5,655 0.13% 0.13% 0.11%
Asian alone (NH) 257,843 318,869 408,691 4.80% 6.14% 7.75%
Pacific Islander alone (NH) 1,543 1,043 961 0.03% 0.02% 0.02%
Other race alone (NH) 7,291 7,751 20,538 0.14% 0.15% 0.39%
Mixed race or Multiracial (NH) 82,413 71,432 136,074 1.53% 1.38% 2.58%
Hispanic or Latino (any race) 1,071,740 1,244,762 1,382,778 19.93% 23.96% 26.21%
Total 5,376,741 5,194,675 5,275,541 100.00% 100.00% 100.00%

As of the 2010 Census, the population of the county was 5,194,675, White Americans made up 55.4% of Cook County's population; non-Hispanic whites represented 43.9% of the population. African Americans made up 24.8% of the population. Native Americans made up 0.4% of Cook County's population. Asian Americans made up 6.2% of the population (1.8% Indian, 1.2% Filipino, 1.2% Chinese, 0.7% Korean, 0.3% Vietnamese, 0.2% Japanese, 0.8% Other). Pacific Islander Americans made up less than 0.1% of the population. People from other races made up 10.6% of the population; people from two or more races made up 2.5% of the county's population. Hispanics and Latinos (of any race) made up 24.0% of Cook County's population.

As of the 2000 Census,[18] there were 5,376,741 people, 1,974,181 households, and 1,269,398 families residing in the county. The population density was 5,686 inhabitants per square mile (2,195/km2). There were 2,096,121 housing units at an average density of 2,216 per square mile (856/km2). The racial makeup of the county was 56.27% white, 26.14% Black or African American, 0.29% Native American, 4.84% Asian, 0.05% Pacific Islanders, 9.88% from other races, and 2.53% from two or more races. 19.93% of the population were Hispanic or Latino of any race. 9.1% were of Polish, 8.1% German, 7.9% Irish and 5.7% Italian ancestry. 17.63% reported speaking Spanish at home; 3.13% speak Polish.[19]

Whites (Hispanic and non-Hispanic) number roughly 2,793,500. There are about 2,372,500 non-Hispanic whites residing in Cook County. Sizeable non-Hispanic white populations are those of German (11.4%), Irish (10.3%), Polish (9.7%), Italian (6.1%), and British (4.1%) descent. There are also significant groups of Swedish (1.5%), Russian (1.5%), French (1.3%), Greek (1.2%), Czech (1.0%), Dutch (1.0%), Lithuanian (0.9%), and Norwegian (0.8%) descent.

Black Americans are the second largest racial group. Black Americans form over one-quarter (25.4%) of Cook County's population. Blacks of non-Hispanic origin form 25.2% of the population; black Hispanics make up the remaining 0.2% of the populace. There are roughly 1,341,000 African Americans of both Hispanic and non-Hispanic origin living in Cook County; 1,328,000 are non-Hispanic blacks. Roughly 52,500 people were of Sub-Saharan African ancestry, making up 1.0% of the total population.

Approximately 10,300 residents of Cook County are of Native American ancestry. They consist of Cherokee, Chippewa, Navajo, and Sioux. Native Americans of Hispanic origin represent a sizeable portion of the Native American population. Nearly 6,000 Native Americans are of non-Hispanic origin, and some 4,300 are of Hispanic origin. Over 40% of the Native American racial group is of Hispanic descent.

Non-English speakers in Cook County

Asian Americans are a very sizeable racial group in the county, numbering about 301,000. The Asian population is ethnically diverse, and includes roughly 87,900 Indians, 61,700 Filipinos, 60,700 Chinese, 35,000 Koreans, 13,700 Vietnamese, and 11,100 Japanese. Roughly 30,800 are of other Asian ethnic groups, such as Thai, Cambodian, and Hmong.

Approximately 3,000 residents are of Pacific Islander heritage. This group includes roughly Native Hawaiians, Guamanians, Samoans, and various people of other Pacific Islander groups.

Hispanic and Latino Americans make up over one-fifth (22.8%) of Cook County's population. Roughly 1,204,000 Latinos live in the county. Mexicans are the most common Latino group. Cook County's 925,000 Mexican Americans make up 17.5% of its population. Roughly 127,000 Puerto Ricans live in the county, while over 12,200 Cubans reside in the county. There are some 140,000 Hispanics and Latinos of other nationalities living in Cook County (i.e. Colombian, Bolivian, etc.), and they collectively make up 2.6% of the county's population.[20][21]

Religion

[edit]

In 2010 statistics, the largest religious group in Cook County was the Archdiocese of Chicago, with 1,947,223 Catholics worshipping at 371 parishes, followed by 209,195 non-denominational adherents with 486 congregations, an estimated 201,152 Muslims with 62 congregations, 68,865 NBC Baptists with 99 congregations, 49,925 ELCA Lutherans with 145 congregations, 49,909 SBC Baptists with 181 congregations, 45,979 LCMS Lutherans with 120 congregations, 39,866 UCC Christians with 101 congregations, 33,584 UMC Methodists with 121 congregations, and 32,646 AG Pentecostals with 64 congregations. Altogether, 59.6% of the population was claimed as members by religious congregations, although members of historically African-American denominations were underrepresented due to incomplete information.[22] In 2014, Cook County had 2,001 religious organizations, second only to Los Angeles County out of all US counties.[23]

Geography

[edit]
Chicago, Illinois
Climate chart (explanation)
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Source: The Weather Channel[24]
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According to the U.S. Census Bureau, the county has a total area of 1,635 square miles (4,230 km2), of which 945 square miles (2,450 km2) is land and 690 square miles (1,800 km2) (42.2%) is water.[25] It is the sixth largest county in Illinois by land area, and the largest in total area. Most of the water is in Lake Michigan. The highest point is more than 950 feet (290 m),[1][2] and is in northwest Barrington Township, in the northwest corner of the county. The lowest point is less than 580 feet (180 m),[1][3] along the Lake Michigan shoreline.

Climate and weather

[edit]

In July, temperatures in Chicago, Cook County average daytime highs of 84 °F (29 °C), and nighttime lows of 68 °F (20 °C); and January daytime highs of 31 °F (−1 °C), and nighttime lows of 18 °F (−8 °C). Winter temperatures will sometimes veer above 40 °F (4 °C), and, although not common, have also risen over 50 °F (10 °C) on some winter days. Average monthly precipitation ranged from 4.30 inches (109 mm) in June to 1.77 inches (45 mm) in February.[24]

National protected areas

[edit]

Government and politics

[edit]

Government

[edit]
Main article: Government of Cook County, Illinois

The government of Cook County is primarily composed of the Board of Commissioners headed by the President of the County Board, other elected officials such as the Sheriff, State's Attorney, Treasurer, Board of Review, Clerk, Assessor, Recorder, Circuit Court judges, and Circuit Court Clerk, as well as numerous other officers and entities. Cook County is the only home rule county in Illinois.[26] The Cook County Code is the codification of Cook County's local ordinances. Cook County's current County Board president is Toni Preckwinkle.

The Circuit Court of Cook County, which is an Illinois state court of general jurisdiction is funded, in part, by Cook County, and accepts more than 1.2 million cases each year for filing.[27] The Cook County Department of Corrections, also known as the Cook County Jail, is the largest single-site jail in the nation. The Cook County Juvenile Detention Center, under the authority of the Chief Judge of the court, is the first juvenile center in the nation and one of the largest in the nation. The Cook County Law Library is the second-largest county law library in the nation.

The Bureau of Health Services administers the county's public health services and is the third-largest public health system in the nation. Three hospitals are part of this system: John H. Stroger, Jr. Hospital of Cook County, Provident Hospital, and Oak Forest Hospital of Cook County, along with over 30 clinics.

The Cook County Department of Transportation is responsible for the design and maintenance of roadways in the county. These thoroughfares are composed mostly of major and minor arterials, with a few local roads. Although the County Department of Transportation was instrumental in designing many of the expressways in the county, today they are under the jurisdiction of the state.

The Cook County Forest Preserves, organized in 1915, is a separate, independent taxing body, but the Cook County Board of Commissioners also acts as its Board of Commissioners. The district is a belt of 69,000 acres (280 km2) of forest reservations surrounding the city of Chicago. The Brookfield Zoo (managed by the Chicago Zoological Society) and the Chicago Botanic Garden (managed by the Chicago Horticultural Society) are located in the forest preserves.

Cook County is the fifth-largest employer in Chicago.[28]

In March 2008, the County Board increased the sales tax by one percent to 1.75 percent. This followed a quarter-cent increase in mass transit taxes. In Chicago, the rate increased to 10.25 percent, the steepest nominal rate of any major metropolitan area in America. In Evanston, sales tax reached 10 percent and Oak Lawn residents pay 9.5 percent.[29] On July 22, 2008, the Cook County board voted against Cook County Commissioner's proposal to repeal the tax increase.[30]

In 2016, Cook County joined Chicago in adopting a $13 hourly minimum wage.[31] Cook County Board chairman John Daley called the wage hike "the moral and right thing to do." In June 2017, however, nearly 75 home rule municipalities passed measures opting themselves out of the increase.[32]

Politics

[edit]

The county has more Democratic Party members than any other Illinois county and it is one of the most Democratic counties in the United States.[33] Since 1932, the majority of its voters have only supported a Republican candidate in a Presidential election three times, all during national Republican landslides–Dwight Eisenhower over native son Adlai Stevenson II in 1952 and 1956, and Richard Nixon over George McGovern in 1972. Since then, the closest a Republican has come to carrying the county was in 1984, when Ronald Reagan won 48.4 percent of the county's vote. In 2020, 74 percent of the county voted for Joe Biden and 24 percent voted for Donald Trump.

In 1936, with Franklin D. Roosevelt receiving 1,253,164 votes in the county, Cook County became the first county in American history where a candidate received one million votes.

The Cook County Democratic Party represents Democratic voters in 50 wards in the city of Chicago and 30 suburban townships of Cook County. The organization has dominated County, city, and state politics since the 1930s. The last Republican mayor of Chicago was William Hale "Big Bill" Thompson, who left office in 1931 with a record of corruption. The most successful Republican candidate for mayor since then was Bernard Epton, who in 1983 came within 3.3 percentage points of defeating Democrat Harold Washington.[34] The county's Republican Party organization is the Cook County Republican Party.

The last Republican governor to carry the county was Jim Edgar in his 1994 landslide. The last Republican senator to do so was Charles H. Percy in 1978.

United States presidential election results for Cook County, Illinois[failed verification][failed verification][35][36]
Year Republican / Whig Democratic Third party(ies)
No.  % No.  % No.  %
2024 583,852 28.08% 1,447,821 69.63% 47,502 2.28%
2020 558,269 24.01% 1,725,973 74.22% 41,163 1.77%
2016 453,287 20.79% 1,611,946 73.93% 115,111 5.28%
2012 495,542 24.59% 1,488,537 73.88% 30,740 1.53%
2008 487,736 22.82% 1,629,024 76.21% 20,706 0.97%
2004 597,405 29.15% 1,439,724 70.25% 12,305 0.60%
2000 534,542 28.65% 1,280,547 68.63% 50,818 2.72%
1996 461,557 26.73% 1,153,289 66.79% 111,820 6.48%
1992 605,300 28.20% 1,249,533 58.21% 291,822 13.59%
1988 878,582 43.36% 1,129,973 55.77% 17,589 0.87%
1984 1,055,558 48.40% 1,112,641 51.02% 12,536 0.57%
1980 856,574 39.60% 1,124,584 51.99% 181,939 8.41%
1976 987,498 44.69% 1,180,814 53.44% 41,436 1.88%
1972 1,234,307 53.41% 1,063,268 46.01% 13,462 0.58%
1968 960,493 41.11% 1,181,316 50.56% 194,729 8.33%
1964 895,718 36.82% 1,537,181 63.18% 0 0.00%
1960 1,059,607 43.33% 1,378,343 56.37% 7,319 0.30%
1956 1,293,223 56.80% 977,821 42.95% 5,800 0.25%
1952 1,188,973 50.21% 1,172,454 49.51% 6,512 0.28%
1948 1,015,800 45.23% 1,216,636 54.17% 13,463 0.60%
1944 924,659 41.91% 1,275,367 57.81% 6,165 0.28%
1940 938,454 44.38% 1,168,141 55.24% 8,212 0.39%
1936 701,206 34.90% 1,253,164 62.36% 55,087 2.74%
1932 690,146 41.47% 919,231 55.23% 54,855 3.30%
1928 812,063 52.73% 716,283 46.51% 11,825 0.77%
1924 688,973 61.87% 226,141 20.31% 198,538 17.83%
1920 635,197 71.12% 197,499 22.11% 60,441 6.77%
1916 435,695 51.20% 379,438 44.59% 35,830 4.21%
1912 74,851 17.44% 130,702 30.44% 223,759 52.12%
1908 230,400 55.51% 152,990 36.86% 31,701 7.64%
1904 229,848 58.49% 103,762 26.41% 59,335 15.10%
1900 203,760 50.80% 186,193 46.42% 11,181 2.79%
1896 221,823 58.43% 152,146 40.08% 5,639 1.49%
1892 111,254 42.57% 144,604 55.33% 5,472 2.09%
1844 1,119 35.58% 2,026 64.42% 0 0.00%

Secession movements

[edit]

To establish more localized government control and policies which reflect the often different values and needs of large suburban sections of the sprawling county, secession movements have been made over the years which called for certain townships or municipalities to form their own independent counties.

In the late 1970s, a movement started which proposed a separation of six northwest suburban townships, Cook County's panhandle (Barrington, Hanover, Palatine, Wheeling, Schaumburg, and Elk Grove) from Cook to form Lincoln County, in honor of the former U.S. president and Illinois resident.[37] It is likely that Arlington Heights would have been the county seat. This northwest suburban region of Cook was at the time moderately conservative and has a population over 500,000. Local legislators, led by State Senator Dave Regnar, went so far as to propose it as official legislation in the Illinois House. The legislation died, however, before coming to a vote.

In 2004, Blue Island mayor Donald E. Peloquin organized a coalition of fifty-five south and southwest suburban municipalities to form a new county, also proposing the name Lincoln County. The county would include everything south of Burbank, stretching as far west as Orland Park, as far east as Calumet City, and as far south as Matteson, covering an expansive area with a population of over one million residents. Peloquin argued that the south suburbs are often shunned by the city (although Chicago is not bound or required to do anything for other municipalities) and he blamed the Chicago-centric policies of Cook County for failing to jumpstart the somewhat-depressed south suburban local economy. Pending sufficient interest from local communities, Peloquin planned a petition drive to place a question regarding the secession on the general election ballot, but the idea was not met with success.[38]

In arguing against the Lincoln County proposal, others noted several of the cities involved had power structures, law enforcement, or de facto "mayors for life" often accused in the press, or civilly or criminally charged with, political corruption, cronyism, and nepotism, and themselves being the main factor in their depressed economies rather than anyone in Cook County government. The opposition decried that their true reason for joining the secession effort was to start with a 'clean slate' with a new county government by design less willing to enforce responsibility against their abuses of power.[39][40]

Talk of secession from Cook County amongst some outlying communities again heated up in mid-2008 in response to a highly controversial 1% sales tax hike which has pushed the tax rates across the county communities up amongst the highest in the nation. Some border towns in particular had been outraged, as people can take their business across the county border (paying, for instance, 7% in Lake County instead of Palatine's 9.5%).[41] The secession issue eventually died down from the nominal tax increase.

In 2011, two downstate Republican state representatives, Bill Mitchell of the 87th district and Adam Brown of the 101st district, proposed statehood for Cook County. Mitchell said that Chicago is "dictating its views" to the rest of the state and Brown added that Chicago "overshadows" the rest of Illinois.[42]

Infrastructure

[edit]

Canals

[edit]

Construction of the Erie Canal in New York State made a connection from the Atlantic Ocean to the Great Lakes in 1821. As the Midwest farms proved productive, with much grain to sell to other parts of the US, Chicago and Cook County saw the benefit of a canal to improve the link from the Great Lakes to the Mississippi River. The Illinois and Michigan Canal was completed in 1848, extending from the Bridgeport neighborhood in Chicago on the Chicago River, to the Illinois River at the cities of LaSalle-Peru. This canal spurred the growth of Chicago and the areas around it, as water travel was the primary way to ship grain or other commodities in that part of the 19th century. The Illinois and Michigan Canal ceased major operation in 1933. Portions are now designated as a National Historic Corridor. The two canals and the Great Lakes cemented trade ties between the Midwest and the Northeast, encouraging farmers to grow more than they needed to feed themselves in Illinois, with a large market for grain now open to them. Towns in Cook County along the Canal grew. From a national perspective, the trade ties made the South region of the US less important to the Northeast as a trade partner.

The Chicago Sanitary and Ship Canal, completed in 1900, largely replaced the functions of the Illinois and Michigan Canal. This canal resulted in the reversal of the direction of flow of the main stem and the South branch of the Chicago River; they used to empty into Lake Michigan and now those river sections flow toward the Des Plaines River. The Sanitary and Ship Canal was built to serve many aims, including ending using Lake Michigan as a sewer, sending waste water through treatment plants and sending it away from Lake Michigan. It is also a waterway for movement of ships.

Railway network

[edit]

The next major technology for transportation was railroads. Chicago and the towns along the canal and rivers understood the value of being a hub of a major network. Rail lines spurred out from Chicago by the 1850s, with major growth in the rail network for freight and passenger transportation coming after the American Civil War, when the transcontinental railroads were completed, coast to coast across the US, stopping in Chicago, the heart of Cook County.

Local transit

[edit]

Major highways

[edit]

Following on the well-established position of Chicago as a transportation hub, the Interstate highway network maintained Chicago as a hub of that network, as well as serving the travel needs within the region.

Airports

[edit]

When the age of air travel began in the 20th century, Midway Airport was built on 1 square mile (2.6 km2) of land and served as the major Chicago area airport from 1927 to 1955. Midway has been enlarged and continues to operate as of 2024. As air travel became more important for passenger travel, and then for select freight commodities, O'Hare International Airport was built adjacent to a military airfield in the northwest part of Cook County. The City of Chicago annexed the land for the airport, so that the city controls both airports serving a large area. During the second half of the 20th century, it was the world's busiest airport. The approach of Cook County and Chicago to air travel has been the same as the approach to canal, railroad and highway transportation, to serve as a major national hub.

There has been a long running plan for a third major airport to serve the south side of the city and the southern and southwestern suburbs, the Proposed Chicago south suburban airport intended for Peotone, Illinois. The state of Illinois has been addressing this topic since 1986. Some land has been acquired, but there is not a functioning airport there, as of August 2020.

Communities

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Incorporated communities

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Largest cities or towns in Cook County, Illinois
2018 U.S. Census Bureau Estimate[43]
Rank County Pop.
Chicago
Chicago 		1 Chicago Cook / DuPage 2,705,994
2 Elgin Cook / Kane 111,683
3 Cicero Cook 81,597
4 Arlington Heights Cook 75,249
5 Evanston Cook 73,509
6 Schaumburg Cook / DuPage 71,290
7 Palatine Cook 68,053
8 Skokie Cook 63,280
9 Des Plaines Cook 58,959
10 Orland Park Cook / Will 58,312
Community
 Community
type 		Population Total
Area 		Water
Area 		Land
Area 		Pop.
Density
Alsip village 19,063 6.63 0.10 6.53 2,921.53
Arlington Heights village 77,676 16.64 0.03 16.61 4,677.87
Barrington (partly in Lake County) village 10,722 4.79 0.19 4.61 2,327.33
Barrington Hills (mostly) village 4,114 27.62 0.62 27.00 152.34
Bartlett (mostly in DuPage County) village 41,105 15.94 0.19 15.75 2,610.01
Bedford Park village 602 6.04 0.11 5.93 101.45
Bellwood village 18,789 2.40 0.00 2.40 7,835.28
Bensenville (mostly in DuPage County) village 18,813 5.58 0.05 5.53 3,401.37
Berkeley village 5,338 1.40 0.00 1.40 3,807.42
Berwyn city 57,250 3.90 0.00 3.90 14,664.45
Blue Island city 22,558 4.16 0.09 4.07 5,541.14
Bridgeview village 17,027 4.13 0.00 4.13 4,119.77
Broadview village 7,998 1.78 0.00 1.78 4,500.84
Brookfield village 19,476 3.07 0.01 3.06 6,356.40
Buffalo Grove (mostly in Lake County) village 43,212 9.58 0.02 9.56 4,518.67
Burbank city 29,439 4.17 0.00 4.17 7,059.71
Burnham village 4,046 1.94 0.09 1.85 2,181.13
Burr Ridge (mostly in DuPage County) village 11,192 7.33 0.14 7.20 1,554.88
Calumet City city 36,033 7.32 0.12 7.20 5,005.97
Calumet Park village 7,025 1.15 0.04 1.12 6,289.17
Chicago (county seat and largest municipality, partly in DuPage County) city 2,746,388 234.53 6.80 227.73 12,059.84
Chicago Heights city 27,480 10.30 0.01 10.28 2,672.37
Chicago Ridge village 14,433 2.27 0.00 2.27 6,363.76
Cicero town 85,268 5.87 0.00 5.87 14,538.45
Country Club Hills city 16,775 4.99 0.02 4.97 3,375.25
Countryside city 6,420 2.88 0.00 2.88 2,230.72
Crestwood village 10,826 3.08 0.03 3.05 3,550.67
Deer Park (mostly in Lake County) village 3,681 3.75 0.10 3.65 1,007.39
Deerfield (mostly in Lake County) village 19,196 5.55 0.02 5.53 3,471.25
Des Plaines city 60,675 14.38 0.15 14.24 4,261.48
Dixmoor village 2,973 1.25 0.00 1.25 2,380.30
Dolton village 21,426 4.69 0.12 4.57 4,687.38
East Dundee (mostly in Kane County) village 3,152 3.15 0.24 2.91 1,082.05
East Hazel Crest village 1,297 0.78 0.00 0.78 1,654.34
Elgin (part) city 114,797 38.60 0.57 38.03 3,018.83
Elk Grove Village (partly in DuPage County) village 32,812 11.66 0.06 11.60 2,827.89
Elmhurst (part) city 45,786 10.28 0.06 10.22 4,480.92
Elmwood Park village 24,521 1.91 0.00 1.91 12,851.68
Evanston city 78,110 7.80 0.02 7.78 10,041.14
Evergreen Park village 19,943 3.16 0.00 3.16 6,305.09
Flossmoor village 9,704 3.66 0.00 3.66 2,650.64
Ford Heights village 1,813 1.95 0.00 1.95 931.65
Forest Park village 14,339 2.40 0.00 2.40 5,969.61
Forest View village 792 1.29 0.13 1.17 678.08
Frankfort (mostly in Will County) village 20,296 15.79 0.00 15.79 1,285.04
Franklin Park village 18,467 4.77 0.00 4.77 3,868.24
Glencoe village 8,849 3.78 0.06 3.72 2,378.76
Glenview village 48,705 14.04 0.04 14.00 3,478.68
Glenwood village 8,662 3.26 0.00 3.26 2,653.80
Golf village 514 0.45 0.00 0.45 1,147.32
Hanover Park (mostly in DuPage County) village 37,470 6.52 0.10 6.42 5,834.63
Harvey city 20,324 6.21 0.00 6.21 3,274.90
Harwood Heights village 9,065 0.82 0.00 0.82 10,987.88
Hazel Crest village 13,382 3.42 0.02 3.40 3,939.36
Hickory Hills city 14,505 2.84 0.00 2.84 5,100
Hillside village 8,320 3.17 0.00 3.17 2,626.26
Hinsdale (mostly in DuPage County) village 17,395 4.66 0.04 4.62 3,763
Hodgkins village 1,500 2.77 0.05 2.71 553.10
Hoffman Estates village 52,530 21.25 0.18 21.07 2,493.71
Homer Glen (mostly in Will County) village 24,543 22.16 0.04 22.13 1,109.29
Hometown city 4,343 0.48 0.00 0.48 9,066.81
Homewood village 19,463 5.26 0.05 5.22 3,731.40
Indian Head Park village 4,065 0.94 0.01 0.93 4,370.97
Inverness village 7,616 6.69 0.15 6.53 1,165.60
Justice village 12,600 2.88 0.04 2.84 4,436.62
Kenilworth village 2,514 0.61 0.00 0.61 4,141.68
La Grange village 16,321 2.52 0.00 2.52 6,463.76
La Grange Park village 13,475 2.23 0.00 2.23 6,034.48
Lansing village 29,076 7.52 0.06 7.46 3,896.54
Lemont (partly in DuPage County and Will County) village 17,629 8.74 0.38 8.37 2,107.47
Lincolnwood village 13,463 2.69 0.00 2.69 5,001.11
Lynwood village 9,116 5.04 0.08 4.96 1,836.42
Lyons village 10,817 2.27 0.07 2.21 4,901.22
Markham city 11,661 5.41 0.00 5.41 2,157.45
Matteson village 19,073 9.32 0.03 9.29 2,054.17
Maywood village 23,512 2.72 0.00 2.72 8,653.66
McCook village 249 2.63 0.02 2.61 95.26
Melrose Park village 24,796 4.35 0.00 4.35 5,696.30
Merrionette Park village 1,969 0.38 0.00 0.38 5,250.67
Midlothian village 14,325 2.82 0.00 2.82 5,081.59
Morton Grove village 25,297 5.09 0.00 5.09 4,971.89
Mount Prospect village 56,852 10.76 0.04 10.72 5,303.85
Niles village 30,912 5.85 0.00 5.85 5,285.91
Norridge village 15,251 1.81 0.00 1.81 8,435.29
North Riverside village 7,426 1.64 0.00 1.64 4,517.03
Northbrook village 35,222 13.30 0.07 13.24 2,660.27
Northfield village 5,751 3.23 0.00 3.23 1,780.50
Northlake city 12,840 3.18 0.00 3.18 4,042.82
Oak Brook (mostly in DuPage County) village 8,163 8.30 0.32 7.98 1,023.45
Oak Forest city 27,478 6.07 0.05 6.02 4,563.69
Oak Lawn village 58,362 8.57 0.00 8.57 6,809.24
Oak Park village 54,583 4.70 0.00 4.70 11,613.40
Olympia Fields village 4,718 2.94 0.00 2.94 1,605.31
Orland Hills village 6,893 1.15 0.01 1.15 6,020.09
Orland Park (partly in Will County) village 58,703 22.31 0.28 22.03 2,664.93
Palatine village 67,908 14.28 0.16 14.11 4,811.39
Palos Heights city 12,068 3.87 0.10 3.77 3,197.67
Palos Hills city 18,530 4.29 0.04 4.25 4,364.11
Palos Park village 4,899 6.57 0.12 6.45 759.65
Park Forest (partly in Will County) village 21,687 4.96 0.00 4.96 4,371.50
Park Ridge city 39,656 7.13 0.05 7.09 5,594.81
Phoenix village 1,708 0.46 0.00 0.46 3,681.03
Posen village 5,632 1.17 0.00 1.17 4,817.79
Prospect Heights city 16,058 4.29 0.03 4.26 3,773.03
Richton Park village 12,775 4.40 0.01 4.39 2,908.70
River Forest village 11,794 2.48 0.00 2.48 4,724.60
River Grove village 10,612 2.39 0.00 2.39 4,438.31
Riverdale village 10,663 3.75 0.17 3.58 2,982.66
Riverside village 9,298 2.00 0.02 1.98 4,700.71
Robbins village 4,629 1.45 0.00 1.45 3,194.62
Rolling Meadows city 24,200 5.62 0.01 5.62 4,309.12
Roselle (mostly in DuPage County) village 22,897 5.61 0.08 5.53 4,140.51
Rosemont village 3,952 1.79 0.00 1.79 2,205.36
Sauk Village (partly in Will County) village 9,921 4.00 0.00 3.99 2,485.22
Schaumburg (partly in DuPage County) village 78,723 19.46 0.12 19.35 4,069.21
Schiller Park village 11,709 2.77 0.00 2.77 4,227.08
Skokie village 67,824 10.06 0.00 10.06 6,739.27
South Barrington village 5,077 7.71 0.28 7.43 683.59
South Chicago Heights village 4,026 1.60 0.02 1.58 2,546.49
South Holland village 21,465 7.25 0.02 7.24 2,966.42
Steger (partly in Will County) village 9,584 3.40 0.00 3.40 2,815.51
Stickney village 7,110 1.96 0.04 1.92 3,695.43
Stone Park village 4,576 0.34 0.00 0.34 13,302.33
Streamwood village 39,577 7.83 0.03 7.80 5,075.28
Summit village 11,161 2.26 0.14 2.12 5,267.11
Thornton village 2,386 2.40 0.03 2.38 1,004.63
Tinley Park (partly in Will County) village 55,971 16.13 0.01 16.12 3,472.15
University Park (mostly in Will County) village 7,145 10.73 0.00 10.73 666.08
Westchester village 16,892 3.69 0.00 3.69 4,582.75
Western Springs village 13,629 2.79 0.00 2.79 4,893.72
Wheeling village 39,137 8.73 0.06 8.67 4,513.03
Willow Springs (small portion in DuPage County) village 5,857 4.25 0.10 4.15 1,411.67
Wilmette village 28,170 5.41 0.01 5.40 5,215.70
Winnetka village 12,475 3.89 0.08 3.81 3,344.00
Woodridge (mostly in DuPage County and Will County) village 34,158 9.79 0.16 9.63 3,546.67
Worth village 10,970 2.38 0.01 2.37 4,630.65
Cook County county 5,275,541 1,635 690 945 3,200

Unincorporated communities

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Historic site

[edit]

Townships

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The county is divided into 29 townships, in addition to the cities of Chicago and Evanston.

Worth TownshipWheeling TownshipThornton TownshipStickney TownshipStickney TownshipSchaumburg TownshipRiverside TownshipRiver Forest TownshipRich TownshipProviso TownshipPalos TownshipPalatine TownshipOrland TownshipOak Park TownshipNorwood Park TownshipNorthfield TownshipNiles TownshipNew Trier TownshipMaine TownshipLyons TownshipLeyden TownshipLemont TownshipHanover TownshipEvanstonElk Grove TownshipCicero TownshipCalumet TownshipBremen TownshipBloom TownshipBerwyn TownshipBarrington Township
Cook County townships (clickable)

Current townships and independent cities

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The 29 townships and 2 independent cities of Cook County, with their populations as of the 2010 Census, are:[44]

Former townships

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Chicago's eight former townships and annexed parts of others no longer have any governmental structure or responsibility since their annexations, but their names and boundaries are still used on property plats and by Cook County for tax assessment purposes. In 2014, Evanston Township was dissolved by voters and its functions were absorbed by the city of Evanston.[45]

Adjacent counties

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Cook County and adjacent counties, from ISS Expedition 37 in 2013.

Cook County is one of the few U.S. counties to border two counties of the same name in different states (Lake County, Illinois and Lake County, Indiana).

Education

[edit]

Public school districts

[edit]
Main article: List of school districts in Cook County, Illinois

Colleges and universities

[edit]

See also

[edit]

References

[edit]
  1. ^ a b c d "Lowest and Highest Points in Cook County". Illinois State Geological Survey. Archived from the original on December 1, 2016. Retrieved November 30, 2016. Greater than 950 ft max and Less than 580 ft min
  2. ^ a b Streamwood Quadrangle – Illinois – Cook Co (Map). 1:24,000. 7.5-Minute Series (Topographic). United States Geological Survey. 2013.
  3. ^ a b Chicago Loop Quadrangle – Illinois – Cook Co (Map). 1:24,000. 7.5-Minute Series (Topographic). United States Geological Survey. 2013.
  4. ^ "Gross Domestic Product: All Industries in Cook County, IL". fred.stlouisfed.org.
  5. ^ "About Cook County | CookCountyIL.gov". www.cookcountyil.gov. Archived from the original on November 30, 2020. Retrieved November 15, 2020.
  6. ^ "County Population Estimates". Archived from the original on September 24, 2015. Retrieved April 4, 2014.
  7. ^ National Academy of Sciences (2001). Growing Populations, Changing Landscapes: Studies from India, China, and the United States. p. 278. doi:10.17226/10144. ISBN 978-0-309-07554-1. Archived from the original on November 15, 2020. Retrieved November 15, 2020.
  8. ^ "Annual Estimates of the Resident Population for Counties: April 1, 2020 to July 1, 2023". United States Census Bureau. Retrieved April 2, 2024.
  9. ^ "U.S. Decennial Census". United States Census Bureau. Archived from the original on April 26, 2015. Retrieved July 4, 2014.
  10. ^ "Historical Census Browser". University of Virginia Library. Archived from the original on August 11, 2012. Retrieved July 4, 2014.
  11. ^ "Population of Counties by Decennial Census: 1900 to 1990". United States Census Bureau. Archived from the original on April 24, 2014. Retrieved July 4, 2014.
  12. ^ "Census 2000 PHC-T-4. Ranking Tables for Counties: 1990 and 2000" (PDF). United States Census Bureau. Archived (PDF) from the original on March 27, 2010. Retrieved July 4, 2014.
  13. ^ "State & County QuickFacts". United States Census Bureau. Archived from the original on July 15, 2011. Retrieved January 20, 2016.
  14. ^ "County Median Home Price". National Association of Realtors. January 4, 2019. Archived from the original on April 15, 2022. Retrieved April 14, 2022.
  15. ^ "P004: Hispanic or Latino, and Not Hispanic or Latino by Race – 2000: DEC Summary File 1 – Cook County, Illinois". United States Census Bureau. Retrieved January 26, 2024.
  16. ^ "P2 Hispanic or Latino, and Not Hispanic or Latino by Race – 2010: DEC Redistricting Data (PL 94-171) – Cook County, Illinois". United States Census Bureau. Archived from the original on April 5, 2023. Retrieved April 5, 2023.
  17. ^ "P2 Hispanic or Latino, and Not Hispanic or Latino by Race – 2020: DEC Redistricting Data (PL 94-171) – Cook County, Illinois". United States Census Bureau. Archived from the original on April 5, 2023. Retrieved April 5, 2023.
  18. ^ "U.S. Census website". United States Census Bureau. Archived from the original on July 9, 2021. Retrieved January 31, 2008.
  19. ^ "Language Map Data Center". www.mla.org. Archived from the original on October 16, 2015. Retrieved October 7, 2006.
  20. ^ American FactFinder Archived February 10, 2020, at archive.today
  21. ^ American FactFinder Archived February 10, 2020, at archive.today
  22. ^ "County Membership Report Cook County (Illinois)". The Association of Religion Data Archives. 2010. Archived from the original on November 24, 2020. Retrieved December 31, 2019.
  23. ^ "Social Capital Variables Spreadsheet for 2014". PennState College of Agricultural Sciences, Northeast Regional Center for Rural Development. December 8, 2017. Archived from the original on December 31, 2019. Retrieved December 30, 2019.
  24. ^ a b "Monthly Averages for Chicago, Illinois". The Weather Channel. Archived from the original on January 29, 2011. Retrieved January 27, 2011.
  25. ^ "Population, Housing Units, Area, and Density: 2010 – County". United States Census Bureau. Archived from the original on February 13, 2020. Retrieved July 11, 2015.
  26. ^ Gove, Samuel Kimball (1996). Illinois Politics and Government: The Expanding Metropolitan Frontier. Politics and Governments of the American States. University of Nebraska Press. p. 156. ISBN 0-8032-7014-3. LCCN 95046017. Retrieved April 4, 2014.
  27. ^ "Circuit Court of Cook County an Informational Guide" (PDF). 2008. Archived from the original (PDF) on March 1, 2007. Retrieved December 16, 2008.
  28. ^ "All the extra cost will be no small change". Chicago Tribune. 2008. Archived from the original on March 2, 2008. Retrieved March 2, 2008.
  29. ^ "Chicago's Largest Employers". ChicagoBusiness. Archived from the original on March 2, 2008. Retrieved March 2, 2008.
  30. ^ "Cook County Board 'rejects' sales tax increase repeal". Chicago Tribune. July 22, 2008. Archived from the original on July 25, 2008. Retrieved July 23, 2008.
  31. ^ Elejalde-Ruiz, Alexia (October 26, 2016). "Cook County approves $13 hourly minimum wage affecting suburbs". Chicago Tribune. Archived from the original on December 5, 2016. Retrieved December 6, 2016.
  32. ^ Slowik, Ted (June 28, 2017). "Slowik: Towns are right to opt out of Cook County minimum wage law". Daily Southtown. Archived from the original on June 29, 2017. Retrieved June 30, 2017.
  33. ^ Alexander Kent; Thomas C. Frohlich; Sam Stebbins; Evan Comen; Michael B. Sauter. "The most Democratic counties in each state". USA TODAY. Archived from the original on November 17, 2020. Retrieved November 15, 2020.
  34. ^ "Bernard E. Epton Is Dead at 66; Ran for Mayor of Chicago in '83". The New York Times. December 14, 1987. Archived from the original on March 9, 2014. Retrieved February 11, 2014.
  35. ^ Leip, David. "Dave Leip's Atlas of U.S. Presidential Elections". uselectionatlas.org. Archived from the original on November 5, 2024. Retrieved November 9, 2024.
  36. ^ "The Popular Vote of the United States, in the Presidential Election of 1844". New York Daily Herald. No. 5270. November 7, 1848. p. 2. Archived from the original on September 23, 2020. Retrieved August 2, 2020 – via Newspapers.com.
  37. ^ Cleveland, Charles (September 1977). "Carving another county out of Cook". Illinois Issues. Archived from the original on September 8, 2006.
  38. ^ "Blue Island mayor wants to create "Lincoln County"". WLS-TV News (abc7chicago.com). June 25, 2004. Archived from the original on June 29, 2011.
  39. ^ The Leader-Chicago Bureau (November 8, 2004). "Split Vote on Cook County secession in the Southland". The Illinois Leader. Archived from the original on November 26, 2004.
  40. ^ "PROFT: Secession: The Most Important Vote Cast in the Southland this November". Archived from the original on December 17, 2004.
  41. ^ "PinPoint Sales Tax Lookup". Zip2tax.com. Archived from the original on May 6, 2015. Retrieved July 21, 2013.
  42. ^ "2 GOP legislators propose separating Cook County from Illinois". The State Journal-Register. November 22, 2011. Archived from the original on September 10, 2012.
  43. ^ "U.S. Census Bureau QuickFacts". 2018 Populations. Archived from the original on February 4, 2021. Retrieved April 25, 2020.
  44. ^ "accessed May 17, 2011". Factfinder2.census.gov. October 5, 2010. Retrieved April 4, 2014.[dead link‍]
  45. ^ Dietrich, Matthew (September 19, 2014). "Evanston Township ceases to exist". HuffPost. Archived from the original on August 12, 2020. Retrieved April 27, 2020.
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