Cook County, IL

Est. 1831
County Website

Population 2010

5,194,675

Population 2020

5,275,541

Registered Voters

1,630,741

Republicans

Democrat

Minor Party

No Party

Brief Political History

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.[29] 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.[30] 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.

Municipalities

City/Town NamePopulation
Chicago2,709,534
Elgin112,653
Cicero82,330
Arlington Heights75,482
Evanston74,587
Schaumburg74,194
Palatine68,407
Skokie63,821
Orland Park58,749
Des Plaines58,673
Tinley Park56,505
Oak Lawn55,936
Berwyn55,407
Mount Prospect54,604
Oak Park52,233
Hoffman Estates50,841
Glenview47,416
Elmhurst46,463
Bartlett41,120
Buffalo Grove41,062
Streamwood39,809
Wheeling38,499
Hanover Park37,984
Park Ridge37,457
Calumet City36,551
Woodridge33,455
Northbrook33,343
Elk Grove Village32,942
Chicago Heights29,856
Niles29,451
Burbank28,729
Lansing27,904
Oak Forest27,617
Wilmette27,247
Melrose Park25,605
Elmwood Park24,468
Harvey24,386
Maywood23,578
Rolling Meadows23,219
Morton Grove23,089
Roselle22,754
Dolton22,737
Blue Island22,611
South Holland21,677
Park Forest21,563
Evergreen Park19,479
Matteson19,385
Homewood19,112
Alsip19,022
Deerfield19,006
Frankfort18,999
Bellwood18,996
Brookfield18,735
Bensenville18,281
Franklin Park17,956
Hinsdale17,710
Palos Hills17,318
Lemont17,023
Country Club Hills16,758
Westchester16,440
Prospect Heights16,137
Bridgeview16,124
La Grange15,545
Norridge14,703
Midlothian14,595
Chicago Ridge14,153
Forest Park13,927
Hickory Hills13,816
Hazel Crest13,549
Richton Park13,504
La Grange Park13,395
Western Springs13,272
Justice12,800
Riverdale12,793
Markham12,493
Palos Heights12,480
Lincolnwood12,434
Winnetka12,428
Northlake12,290
Schiller Park11,621
Summit11,260
River Forest10,970
Crestwood10,831
Burr Ridge10,763
Worth10,633
Lyons10,470
Sauk Village10,423
Barrington10,290
River Grove10,076
Flossmoor9,472
Steger9,366
Lynwood9,279
Glencoe8,888
Riverside8,759
Glenwood8,657
Harwood Heights8,487
Calumet Park8,208
Crete8,118
Hillside8,080
Oak Brook8,075
Broadview7,755
Inverness7,633
Orland Hills7,136
University Park6,947
Stickney6,679
North Riverside6,646
Posen6,149
Countryside5,961
Willow Springs5,604
Northfield5,534
Berkeley5,116
Robbins5,037
South Barrington4,923
Stone Park4,894
Palos Park4,842
Olympia Fields4,821
Hometown4,272
Rosemont4,255
Burnham4,158
South Chicago Heights4,076
Barrington Hills4,070
Deer Park3,884
Indian Head Park3,776
Dixmoor3,604
East Dundee3,181
Ford Heights2,736
Thornton2,545
Kenilworth2,460
Merrionette Park2,050
Phoenix1,884
Hodgkins1,746
East Hazel Crest1,586
Forest View943
Bedford Park614
Golf481
McCook279

Superintendent of Schools

Treasurer / Tax Collector

Assessor

Auditor

County Commission

District 1Brandon Johnson
District 2Dennis Deer
District 3Bill Lowry
District 4Stanley Moore
District 5Deborah Sims
District 6Donna Miller
District 7Alma E. Anaya
District 8Luis Arroyo Jr.
District 9Peter N. Silvestri
District 10Bridget Gainer
District 11John P. Daley
District 12Bridget Degnen
District 13Larry Suffredin
District 14Scott R. Britton
District 15Kevin B. Morrison
District 16Frank J. Aguilar
District 17Sean M. Morrison

School Board

District NameCentral OfficeSchool Count
Aero Special Education CooperativeBurbank2
Alsip, Hazelgreen And Oak Lawn School District 126Alsip4
Arbor Park School District 145Oak Forest4
Argo Consolidated High School District 217Summit1
Arlington Heights School District 25Arlington Heights9
Atwood Heights School District 125Alsip3
Avoca School District 37Wilmette2
Bellwood School District 88Bellwood7
Berkeley School District 87Berkeley6
Berwyn North School District 98Berwyn4
Berwyn South School District 100Berwyn8
Bloom Township High School District 206Chicago Heights3
Bremen Consolidated High School District 228Midlothian4
Brookfield Lagrange Park School District 95Brookfield2
Brookwood School District 167Glenwood4
Burbank School District 111Burbank7
Burnham School District 154-5Burnham1
Calumet City School District 155Calumet City3
Calumet Public School District 132Calumet Park3
Career Development SystemOak Forest-
Career Preparation NetworkOlympia Fields1
Central Stickney School District 110Chicago1
Chicago Heights School District 170Chicago Heights12
Chicago Ridge School District 127-5Chicago Ridge3
Cicero School District 99Cicero17
City Of Chicago School District 299Chicago633
Comm Consolidated School District 59Arlington Heights14
Community Consolidated School District 168Sauk Village3
Community Consolidated School District 62Des Plaines11
Consolidated High School District 218Oak Lawn4
Consolidated High School District 230Orland Park3
Cook County School District 130Blue Island11
Country Club Hills School District 160Country Club Hills3
Des Plaines Valley Education For EmploymentMaywood-
Dolton School District 148Riverdale10
Dolton School District 149Calumet City6
East Maine School District 63Des Plaines7
East Prairie School District 73Skokie1
Eisenhower CooperativeOak Lawn2
Elementary School District 159Matteson4
Elmwood Park Community Unit School District 401Elmwood Park5
Evanston Community Consolidated School District 65Evanston17
Evanston Dists 65/202 Joint AgreementEvanston1
Evanston Township High School District 202Evanston1
Evergreen Park Consolidated High School District 231Evergreen Park1
Evergreen Park Elementary School District 124Evergreen Park5
Exceptional Children Have OpportunitiesSouth Holland5
Fairview School District 72Skokie1
Federation Of Districts For Special EducationBerwyn-
Flossmoor School District 161Chicago Heights5
Ford Heights School District 169Ford Heights2
Forest Park School District 91Forest Park5
Forest Ridge School District 142Oak Forest4
Franklin Park School District 84Franklin Park4
General George Patton School District 133Riverdale2
Glencoe School District 35Glencoe3
Glenview Community Consolidated School District 34Glenview8
Golf Elementary School District 67Morton Grove2
Harvey School District 152Harvey8
Hazel Crest School District 152-5Hazel Crest3
Hillside School District 93Hillside1
Homewood Flossmoor Consolidated High School District 233Flossmoor1
Homewood School District 153Homewood4
Hoover-Schrum Memorial School District 157Calumet City2
Indian Springs School District 109Justice6
Intermediate Service Center 1Des Plaines1
Intermediate Service Center 2Lagrange Park7
Intermediate Service Center 3Chicago1
Intermediate Service Center 4Chicago Heights1
J S Morton High School District 201Cicero4
Kenilworth School District 38Kenilworth1
Kirby School District 140Tinley Park8
Komarek School District 94North Riverside1
La Grange School District 102La Grange Park5
La Grange School District 105 SouthLa Grange5
Lagrange Area Department Special EducationLa Grange2
Lagrange Highlands School District 106La Grange2
Lansing School District 158Lansing5
Lemont Township High School District 210Lemont1
Lemont-Bromberek School District 113ALemont4
Leyden Area Special Education CooperativeFranklin Park-
Leyden Consolidated High School District 212Franklin Park2
Lincoln Elementary School District 156Calumet City1
Lincolnwood School District 74Lincolnwood3
Lindop School District 92Broadview1
Lyons School District 103Lyons6
Lyons Township High School District 204La Grange1
Maine Township High School District 207Park Ridge5
Maine Township Special Education ProgramPark Ridge-
Mannheim School District 83Franklin Park5
Matteson Elementary School District 162Matteson6
Maywood-Melrose Park-Broadview 89Melrose Park11
Midlothian School District 143Midlothian4
Moraine Area Career SystemOak Lawn-
Morton Grove School District 70Morton Grove1
Morton Regional Delivery SystemCicero-
Mount Prospect School District 57Mount Prospect3
New Trier Township High School District 203Northfield2
Niles Elementary School District 71Niles1
Niles Township Consolidated High School District 219Skokie3
Niles Township District For Special EducationMorton Grove1
Norridge School District 80Norridge2
North Palos School District 117Palos Hills5
North Suburban Education Regional For VocationalPark Ridge-
Northbrook Elementary School District 27Northbrook4
Northbrook School District 28Northbrook4
Northbrook/Glenview School District 30Northbrook3
Northfield Township High School District 225Glenview4
Northwest Suburban Educational To CareersArlington Heights1
Nw Suburban Special Education OrganizationMount Prospect6
Oak Lawn Consolidated High School District 229Oak Lawn1
Oak Lawn-Hometown School District 123Oak Lawn6
Oak Park - River Forest School District 200Oak Park1
Oak Park Elementary School District 97Oak Park10
Orland School District 135Orland Park10
Palatine Community Consolidated School District 15Palatine20
Palos Community Consolidated School District 118Palos Park3
Palos Heights School District 128Palos Heights4
Park Forest School District 163Park Forest6
Park Ridge Community Consolidated School District 64Park Ridge8
Pennoyer School District 79Norridge1
Pleasantdale School District 107Burr Ridge2
Posen-Robbins Elementary School District 143-5Posen6
Prairie-Hills Elementary School District 144Markham8
Prospect Heights School District 23Prospect Heights4
Proviso Area Exceptional ChildMaywood4
Proviso Township High School District 209Forest Park3
Reavis Township High School District 220Burbank1
Rhodes School District 84-5River Grove1
Rich Township High School District 227Olympia Fields4
Ridgeland School District 122Oak Lawn5
Ridgewood Consolidated High School District 234Norridge2
River Forest School District 90River Forest3
River Grove School District 85-5River Grove1
River Trails School District 26Mount Prospect3
Riverside School District 96Riverside5
Riverside-Brookfield Township School District 208Riverside1
Rosemont Elementary School District 78Rosemont1
Sandridge School District 172Lynwood1
Schaumburg Community Consolidated School District 54Schaumburg27
Schiller Park School District 81Schiller Park3
Skokie School District 68Skokie4
Skokie School District 69Skokie3
Skokie School District 73-5Skokie3
South Holland School District 150South Holland3
South Holland School District 151South Holland4
Southwest Cook Cooperative Special Educational ProgramOak Forest3
Speed Special Education Joint Agreement #802Chicago Heights6
Steger School District 194Steger4
Summit School District 104Summit5
Sunnybrook School District 171Lansing2
Sunset Ridge School District 29Northfield2
Thornton Fractional Township High School District 215Calumet City2
Thornton School District 154Thornton1
Thornton Township High School District 205South Holland3
Tinley Park Community Consolidated School District 146Tinley Park6
Township High School District 211Palatine7
Township High School District 214Arlington Heights11
Union Ridge School District 86Harwood Heights1
W Harvey-Dixmoor School District 147Harvey5
West Northfield School District 31Northbrook2
Westchester School District 92-5Westchester3
Western Springs School District 101Western Springs4
Wheeling Community Consolidated School District 21Wheeling12
Willow Springs School District 108Willow Springs1
Wilmette School District 39Wilmette6
Winnetka School District 36Winnetka5
Worth School District 127Worth3

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