County in Illinois
Cook County
About 5,182,100 people, median household income $83,500.
District lines run through Cook County, so who represents you here depends on where you live. Search your address to see yours.
Who lives in Cook County
Census survey estimates for 2020 to 2024, rounded.
People
- Population
- 5,182,100
- Median age
- 38.0 years
- Under 18
- 21%
- 65 and over
- 16%
- Veterans, of adults
- 3%
- Speak another language at home
- 36%
Race and ethnicity
- Hispanic or Latino, of any race
- 27%
- White, not Hispanic
- 40%
- Black, not Hispanic
- 22%
- Asian, not Hispanic
- 8%
Income and housing
- Median household income
- $83,500
- Below the poverty line
- 14%
- Bachelor's or higher, adults 25+
- 43%
- Owner-occupied homes
- 58%
- Median home value
- $325,000
2024 vote for president
- Kamala Harris, Democrat
- 69.6%
- Donald Trump, Republican
- 28.1%
- Other candidates
- 2.3%
Votes counted, by precinct. Source: MIT Election Data and Science Lab, precinct returns (public domain).
Represent all of Cook County
Cook County's districts (102)
U.S. House (11)
- U.S. House District 1
Held by Jonathan L. Jackson, Democratic
Part of Cook County: 517,863 people in 2020
- U.S. House District 2
Held by Robin L. Kelly, Democratic
Part of Cook County: 484,666 people in 2020
- U.S. House District 3
Held by Delia C. Ramirez, Democratic
Part of Cook County: 559,688 people in 2020
- U.S. House District 4
Held by Jesús G. "Chuy" García, Democratic
Part of Cook County: 715,443 people in 2020
- U.S. House District 5
Held by Mike Quigley, Democratic
Part of Cook County: 711,350 people in 2020
- U.S. House District 6
Held by Sean Casten, Democratic
Part of Cook County: 439,268 people in 2020
- U.S. House District 7
Held by Danny K. Davis, Democratic
Part of Cook County: 753,677 people in 2020
- U.S. House District 8
Held by Raja Krishnamoorthi, Democratic
Part of Cook County: 357,159 people in 2020
- U.S. House District 9
Held by Janice D. Schakowsky, Democratic
Part of Cook County: 621,642 people in 2020
- U.S. House District 10
Held by Bradley Scott Schneider, Democratic
Part of Cook County: 104,349 people in 2020
- U.S. House District 11
Held by Bill Foster, Democratic
Part of Cook County: 10,436 people in 2020
Illinois Senate (32)
- Illinois Senate District 1
Held by Javier Cervantes, Democratic
Part of Cook County: 217,050 people in 2020
- Illinois Senate District 2
Held by Omar Aquino, Democratic
Part of Cook County: 217,169 people in 2020
- Illinois Senate District 3
Held by Mattie Hunter, Democratic
Part of Cook County: 217,354 people in 2020
- Illinois Senate District 4
Held by Kimberly Lightford, Democratic
Part of Cook County: 207,465 people in 2020
- Illinois Senate District 5
Held by Lakesia Collins, Democratic
Part of Cook County: 217,334 people in 2020
- Illinois Senate District 6
Held by Sara Feigenholtz, Democratic
Part of Cook County: 217,449 people in 2020
- Illinois Senate District 7
Held by Mike Simmons-Gessesse, Democratic
Part of Cook County: 217,225 people in 2020
- Illinois Senate District 8
Held by Ram Villivalam, Democratic
Part of Cook County: 217,570 people in 2020
- Illinois Senate District 9
Held by Laura Fine, Democratic
Part of Cook County: 216,771 people in 2020
- Illinois Senate District 10
Held by Rob Martwick, Democratic
Part of Cook County: 217,169 people in 2020
- Illinois Senate District 11
Held by Mike Porfirio, Democratic
Part of Cook County: 217,299 people in 2020
- Illinois Senate District 12
Held by Celina Villanueva, Democratic
Part of Cook County: 217,115 people in 2020
- Illinois Senate District 13
Held by Robert Peters, Democratic
Part of Cook County: 217,228 people in 2020
- Illinois Senate District 14
Held by Emil Jones, Democratic
Part of Cook County: 213,761 people in 2020
- Illinois Senate District 15
Held by Napoleon Harris, Democratic
Part of Cook County: 182,379 people in 2020
- Illinois Senate District 16
Held by Willie Preston, Democratic
Part of Cook County: 217,174 people in 2020
- Illinois Senate District 17
Held by Elgie Sims, Democratic
Part of Cook County: 193,849 people in 2020
- Illinois Senate District 18
Held by Bill Cunningham, Democratic
Part of Cook County: 217,318 people in 2020
- Illinois Senate District 19
Held by Mike Hastings, Democratic
Part of Cook County: 102,190 people in 2020
- Illinois Senate District 20
Held by Graciela Guzmán, Democratic
Part of Cook County: 217,094 people in 2020
- Illinois Senate District 22
Held by Cristina Castro, Democratic
Part of Cook County: 143,449 people in 2020
- Illinois Senate District 23
Held by Suzy Glowiak Hilton, Democratic
Part of Cook County: 3,015 people in 2020
- Illinois Senate District 24
Held by Seth Lewis, Republican
Part of Cook County: 29,035 people in 2020
- Illinois Senate District 25
Held by Karina Villa, Democratic
Part of Cook County: 22,128 people in 2020
- Illinois Senate District 26
Held by Darby Hills, Republican
Part of Cook County: 75,318 people in 2020
- Illinois Senate District 27
Held by Mark Walker, Democratic
Part of Cook County: 217,152 people in 2020
- Illinois Senate District 28
Held by Laura Murphy, Democratic
Part of Cook County: 206,459 people in 2020
- Illinois Senate District 29
Held by Julie Morrison, Democratic
Part of Cook County: 111,044 people in 2020
- Illinois Senate District 30
Held by Adriane Johnson, Democratic
Part of Cook County: 8,451 people in 2020
- Illinois Senate District 39
Held by Don Harmon, Democratic
Part of Cook County: 185,452 people in 2020
- Illinois Senate District 40
Held by Patrick Joyce, Democratic
Part of Cook County: 59,954 people in 2020
- Illinois Senate District 41
Held by John Curran, Republican
Part of Cook County: 56,121 people in 2020
Illinois House (59)
- Illinois House District 1
Held by Aarón Ortíz, Democratic
Part of Cook County: 108,418 people in 2020
- Illinois House District 2
Held by Lisa Hernandez, Democratic
Part of Cook County: 108,632 people in 2020
- Illinois House District 3
Held by Eva-Dina Delgado, Democratic
Part of Cook County: 108,636 people in 2020
- Illinois House District 4
Held by Lilian Jiménez, Democratic
Part of Cook County: 108,533 people in 2020
- Illinois House District 5
Held by Kimberly Du Buclet, Democratic
Part of Cook County: 108,665 people in 2020
- Illinois House District 6
Held by Sonya Harper, Democratic
Part of Cook County: 108,689 people in 2020
- Illinois House District 7
Held by Chris Welch, Democratic
Part of Cook County: 98,913 people in 2020
- Illinois House District 8
Held by La Shawn Ford, Democratic
Part of Cook County: 108,552 people in 2020
- Illinois House District 9
Held by Yolonda Morris, Democratic
Part of Cook County: 108,687 people in 2020
- Illinois House District 10
Held by Omar Williams, Democratic
Part of Cook County: 108,647 people in 2020
- Illinois House District 11
Held by Ann Williams, Democratic
Part of Cook County: 108,793 people in 2020
- Illinois House District 12
Held by Margaret Croke, Democratic
Part of Cook County: 108,656 people in 2020
- Illinois House District 13
Held by Hoan Huynh, Democratic
Part of Cook County: 108,814 people in 2020
- Illinois House District 14
Held by Kelly Cassidy, Democratic
Part of Cook County: 108,411 people in 2020
- Illinois House District 15
Held by Michael Kelly, Democratic
Part of Cook County: 108,709 people in 2020
- Illinois House District 16
Held by Kevin Olickal, Democratic
Part of Cook County: 108,861 people in 2020
- Illinois House District 17
Held by Jen Gong-Gershowitz, Democratic
Part of Cook County: 108,432 people in 2020
- Illinois House District 18
Held by Robyn Gabel, Democratic
Part of Cook County: 108,339 people in 2020
- Illinois House District 19
Held by Lindsey LaPointe, Democratic
Part of Cook County: 108,549 people in 2020
- Illinois House District 20
Held by Brad Stephens, Republican
Part of Cook County: 108,620 people in 2020
- Illinois House District 21
Held by Abdelnasser Rashid, Democratic
Part of Cook County: 108,781 people in 2020
- Illinois House District 22
Held by Angie Guerrero-Cuellar, Democratic
Part of Cook County: 108,518 people in 2020
- Illinois House District 23
Held by Edgar González, Democratic
Part of Cook County: 108,507 people in 2020
- Illinois House District 24
Held by Theresa Mah, Democratic
Part of Cook County: 108,608 people in 2020
- Illinois House District 25
Held by Curtis Tarver, Democratic
Part of Cook County: 108,487 people in 2020
- Illinois House District 26
Held by Kam Buckner, Democratic
Part of Cook County: 108,741 people in 2020
- Illinois House District 27
Held by Justin Slaughter, Democratic
Part of Cook County: 105,204 people in 2020
- Illinois House District 28
Held by Bob Rita, Democratic
Part of Cook County: 108,557 people in 2020
- Illinois House District 29
Held by Thaddeus Jones, Democratic
Part of Cook County: 73,854 people in 2020
- Illinois House District 30
Held by Will Davis, Democratic
Part of Cook County: 108,525 people in 2020
- Illinois House District 31
Held by Mike Crawford, Democratic
Part of Cook County: 108,638 people in 2020
- Illinois House District 32
Held by Lisa Davis, Democratic
Part of Cook County: 108,536 people in 2020
- Illinois House District 33
Held by Marcus Evans, Democratic
Part of Cook County: 108,624 people in 2020
- Illinois House District 34
Held by Nick Smith, Democratic
Part of Cook County: 85,225 people in 2020
- Illinois House District 35
Held by Mary Gill, Democratic
Part of Cook County: 108,568 people in 2020
- Illinois House District 36
Held by Rick Ryan, Democratic
Part of Cook County: 108,750 people in 2020
- Illinois House District 37
Held by Patrick Sheehan, Republican
Part of Cook County: 25,258 people in 2020
- Illinois House District 38
Held by Debbie Meyers-Martin, Democratic
Part of Cook County: 76,932 people in 2020
- Illinois House District 39
Held by Will Guzzardi, Democratic
Part of Cook County: 108,434 people in 2020
- Illinois House District 40
Held by Jaime Andrade, Democratic
Part of Cook County: 108,660 people in 2020
- Illinois House District 43
Held by Anna Moeller, Democratic
Part of Cook County: 34,909 people in 2020
- Illinois House District 44
Held by Fred Crespo, Democratic
Part of Cook County: 108,540 people in 2020
- Illinois House District 45
Held by Marti Deuter, Democratic
Part of Cook County: 3,015 people in 2020
- Illinois House District 48
Held by Jennifer Sanalitro, Republican
Part of Cook County: 29,035 people in 2020
- Illinois House District 49
Held by Maura Hirschauer, Democratic
Part of Cook County: 22,128 people in 2020
- Illinois House District 51
Held by Nabeela Syed, Democratic
Part of Cook County: 58,804 people in 2020
- Illinois House District 52
Held by Marty McLaughlin, Republican
Part of Cook County: 16,514 people in 2020
- Illinois House District 53
Held by Nicolle Grasse, Democratic
Part of Cook County: 108,563 people in 2020
- Illinois House District 54
Held by Mary Beth Canty, Democratic
Part of Cook County: 108,589 people in 2020
- Illinois House District 55
Held by Justin Cochran, Democratic
Part of Cook County: 108,686 people in 2020
- Illinois House District 56
Held by Michelle Mussman, Democratic
Part of Cook County: 97,773 people in 2020
- Illinois House District 57
Held by Tracy Katz Muhl, Democratic
Part of Cook County: 104,493 people in 2020
- Illinois House District 58
Held by Bob Morgan, Democratic
Part of Cook County: 6,551 people in 2020
- Illinois House District 59
Held by Dan Didech, Democratic
Part of Cook County: 8,451 people in 2020
- Illinois House District 77
Held by Norma Hernandez, Democratic
Part of Cook County: 77,037 people in 2020
- Illinois House District 78
Held by Camille Lilly, Democratic
Part of Cook County: 108,415 people in 2020
- Illinois House District 79
Held by Jackie Haas, Republican
Part of Cook County: 7,769 people in 2020
- Illinois House District 80
Held by Anthony DeLuca, Democratic
Part of Cook County: 52,185 people in 2020
- Illinois House District 82
Held by Nicole La Ha, Republican
Part of Cook County: 56,121 people in 2020
Towns (136)
Cities, villages and unincorporated communities, with the number of people in the county’s part of each at the 2020 Census.
- Chicago (part)2,746,388
- Cicero85,268
- Schaumburg (part)78,723
- Evanston78,110
- Arlington Heights77,676
- Palatine67,908
- Skokie67,824
- Des Plaines60,675
- Oak Lawn58,362
- Orland Park (part)58,344
- Berwyn57,250
- Mount Prospect56,852
- Oak Park54,583
- Hoffman Estates (part)52,530
- Glenview48,705
- Tinley Park (part)48,269
- Park Ridge39,656
- Streamwood39,577
- Wheeling (part)39,137
- Calumet City36,033
- Northbrook35,222
- Elk Grove Village (part)32,812
- Niles30,912
- Burbank29,439
112 more towns
- Lansing29,076
- Wilmette28,170
- Chicago Heights27,480
- Oak Forest27,478
- Morton Grove25,297
- Melrose Park24,796
- Elgin (part)24,647
- Elmwood Park24,521
- Rolling Meadows24,200
- Maywood23,512
- Blue Island22,558
- South Holland21,465
- Dolton21,426
- Harvey20,324
- Hanover Park (part)20,087
- Evergreen Park19,943
- Brookfield19,476
- Homewood19,463
- Matteson19,073
- Alsip19,063
- Bellwood18,789
- Palos Hills18,530
- Park Forest (part)18,482
- Franklin Park18,467
- Lemont (part)17,620
- Bartlett (part)17,211
- Bridgeview17,027
- Westchester16,892
- Country Club Hills16,775
- La Grange16,321
- Prospect Heights16,058
- Norridge15,251
- Hickory Hills14,505
- Chicago Ridge14,433
- Forest Park14,339
- Midlothian14,325
- Buffalo Grove (part)13,812
- Western Springs13,629
- La Grange Park13,475
- Lincolnwood13,463
- Hazel Crest13,382
- Northlake12,840
- Richton Park12,775
- Winnetka12,744
- Justice12,600
- Palos Heights12,068
- River Forest11,717
- Schiller Park11,709
- Markham11,661
- Summit11,161
- Worth10,970
- Crestwood10,826
- Lyons10,817
- Riverdale10,663
- River Grove10,612
- Sauk Village9,921
- Flossmoor9,704
- Riverside9,298
- Lynwood9,116
- Harwood Heights9,065
- Glencoe8,849
- Glenwood8,662
- Hillside8,320
- Broadview7,998
- Inverness7,616
- North Riverside7,426
- Stickney7,110
- Calumet Park7,025
- Orland Hills6,893
- Countryside6,420
- Willow Springs5,857
- Barrington (part)5,856
- Northfield5,751
- Posen5,632
- Berkeley5,338
- South Barrington5,077
- Palos Park4,899
- Olympia Fields4,718
- Robbins4,629
- Stone Park4,576
- Burr Ridge (part)4,366
- Hometown4,343
- Steger (part)4,118
- Indian Head Park4,065
- Burnham4,046
- South Chicago Heights4,026
- Rosemont3,952
- Roselle (part)3,951
- Dixmoor2,973
- Kenilworth2,514
- Thornton2,386
- Hinsdale (part)2,372
- Barrington Hills (part)2,152
- Merrionette Park1,969
- Ford Heights1,813
- Phoenix1,708
- Hodgkins1,500
- East Hazel Crest1,297
- Forest View792
- Bedford Park602
- Golf514
- Deerfield (part)507
- University Park (part)317
- McCook249
- Deer Park (part)18
- Elmhurst (part)8
- Woodridge (part)0
- East Dundee (part)0
- Frankfort (part)0
- Homer Glen (part)0
- Crete (part)0
- Bensenville (part)0
Source: U.S. Census Bureau, American Community Survey 5-year estimates, 2020–2024; towns and counties from the 2020 Census, Demographic and Housing Characteristics. Figures rounded by us. Retrieved 2026-10-19. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.