Cook County, Illinois
What we have for Cook County today, and what is coming.
Basics
- County code (FIPS): 17031
- Land area: 945 square miles
- Population: 5,275,541
Federal money spent here
Fiscal year 2026: $39.4 billion in federal contracts, grants, loans and other awards for work done in Cook County.
Who represents Cook County
U.S. Senate (whole state): Richard J. Durbin (Democrat), Tammy Duckworth (Democrat).
U.S. House districts that include part of this county
| District | Member | Share of county land |
|---|---|---|
| Congressional District 2 | Robin L. Kelly (Democrat) | 17.3% |
| Congressional District 6 | Sean Casten (Democrat) | 14.6% |
| Congressional District 5 | Mike Quigley (Democrat) | 12.4% |
| Congressional District 8 | Raja Krishnamoorthi (Democrat) | 10.8% |
| Congressional District 1 | Jonathan L. Jackson (Democrat) | 9.4% |
| Congressional District 4 | Jesús G. "Chuy" García (Democrat) | 8.7% |
| Congressional District 9 | Janice D. Schakowsky (Democrat) | 8.7% |
| Congressional District 7 | Danny K. Davis (Democrat) | 7.2% |
| Congressional District 3 | Delia C. Ramirez (Democrat) | 5.8% |
| Congressional District 10 | Bradley Scott Schneider (Democrat) | 3.8% |
| Congressional District 11 | Bill Foster (Democrat) | 1.2% |
State senate districts
| District | Member | Share of county land |
|---|---|---|
| State Senate District 15 | Napoleon Harris (Democratic) | 7.3% |
| State Senate District 18 | Bill Cunningham (Democratic) | 6.7% |
| State Senate District 26 | Darby Hills (Republican) | 6.5% |
| State Senate District 17 | Elgie Sims (Democratic) | 6% |
| State Senate District 14 | Emil Jones (Democratic) | 5.8% |
| State Senate District 28 | Laura Murphy (Democratic) | 5.6% |
| State Senate District 19 | Mike Hastings (Democratic) | 5.1% |
| State Senate District 27 | Mark Walker (Democratic) | 4.5% |
| State Senate District 9 | Laura Fine (Democratic) | 4.2% |
| State Senate District 29 | Julie Morrison (Democratic) | 4.2% |
| State Senate District 4 | Kimberly Lightford (Democratic) | 3.8% |
| State Senate District 41 | John Curran (Republican) | 3.8% |
| State Senate District 22 | Cristina Castro (Democratic) | 3.7% |
| State Senate District 11 | Mike Porfirio (Democratic) | 3.6% |
| State Senate District 39 | Don Harmon (Democratic) | 3.6% |
| State Senate District 8 | Ram Villivalam (Democratic) | 3% |
| State Senate District 16 | Willie Preston (Democratic) | 2.9% |
| State Senate District 10 | Rob Martwick (Democratic) | 2.8% |
| State Senate District 1 | Javier Cervantes (Democratic) | 2.6% |
| State Senate District 5 | Lakesia Collins (Democratic) | 1.9% |
| State Senate District 40 | Patrick Joyce (Democratic) | 1.9% |
| State Senate District 3 | Mattie Hunter (Democratic) | 1.7% |
| State Senate District 13 | Robert Peters (Democratic) | 1.7% |
| State Senate District 12 | Celina Villanueva (Democratic) | 1.5% |
| State Senate District 2 | Omar Aquino (Democratic) | 1.2% |
| State Senate District 20 | Graciela Guzmán (Democratic) | 1.1% |
| State Senate District 25 | Karina Villa (Democratic) | 1% |
| State Senate District 7 | Mike Simmons-Gessesse (Democratic) | 0.9% |
| State Senate District 6 | Sara Feigenholtz (Democratic) | 0.7% |
| State Senate District 24 | Seth Lewis (Republican) | 0.7% |
| State Senate District 30 | Adriane Johnson (Democratic) | 0.2% |
| State Senate District 23 | Suzy Glowiak Hilton (Democratic) | 0.1% |
State house / assembly districts
| District | Member | Share of county land |
|---|---|---|
| State House District 38 | Debbie Meyers-Martin (Democratic) | 4.1% |
| State House District 30 | Will Davis (Democratic) | 4% |
| State House District 56 | Michelle Mussman (Democratic) | 3.9% |
| State House District 57 | Tracy Katz Muhl (Democratic) | 3.8% |
| State House District 82 | Nicole La Ha (Republican) | 3.8% |
| State House District 34 | Nick Smith (Democratic) | 3.7% |
| State House District 52 | Marty McLaughlin (Republican) | 3.7% |
| State House District 36 | Rick Ryan (Democratic) | 3.4% |
| State House District 35 | Mary Gill (Democratic) | 3.3% |
| State House District 29 | Thaddeus Jones (Democratic) | 3.2% |
| State House District 27 | Justin Slaughter (Democratic) | 3.1% |
| State House District 51 | Nabeela Syed (Democratic) | 2.8% |
| State House District 28 | Bob Rita (Democratic) | 2.7% |
| State House District 17 | Jen Gong-Gershowitz (Democratic) | 2.6% |
| State House District 44 | Fred Crespo (Democratic) | 2.5% |
| State House District 77 | Norma Hernandez (Democratic) | 2.4% |
| State House District 54 | Mary Beth Canty (Democratic) | 2.3% |
| State House District 7 | Chris Welch (Democratic) | 2.2% |
| State House District 33 | Marcus Evans (Democratic) | 2.2% |
| State House District 53 | Nicolle Grasse (Democratic) | 2.2% |
| State House District 20 | Brad Stephens (Republican) | 1.9% |
| State House District 21 | Abdelnasser Rashid (Democratic) | 1.9% |
| State House District 15 | Michael Kelly (Democratic) | 1.8% |
| State House District 31 | Mike Crawford (Democratic) | 1.7% |
| State House District 55 | Justin Cochran (Democratic) | 1.7% |
| State House District 80 | Anthony DeLuca (Democratic) | 1.7% |
| State House District 8 | La Shawn Ford (Democratic) | 1.6% |
| State House District 18 | Robyn Gabel (Democratic) | 1.6% |
| State House District 22 | Angie Guerrero-Cuellar (Democratic) | 1.6% |
| State House District 2 | Lisa Hernandez (Democratic) | 1.4% |
| State House District 1 | Aarón Ortíz (Democratic) | 1.2% |
| State House District 16 | Kevin Olickal (Democratic) | 1.2% |
| State House District 32 | Lisa Davis (Democratic) | 1.2% |
| State House District 43 | Anna Moeller (Democratic) | 1.2% |
| State House District 78 | Camille Lilly (Democratic) | 1.2% |
| State House District 6 | Sonya Harper (Democratic) | 1% |
| State House District 10 | Omar Williams (Democratic) | 1% |
| State House District 25 | Curtis Tarver (Democratic) | 1% |
| State House District 37 | Patrick Sheehan (Republican) | 1% |
| State House District 49 | Maura Hirschauer (Democratic) | 1% |
| State House District 9 | Yolonda Morris (Democratic) | 0.9% |
| State House District 19 | Lindsey LaPointe (Democratic) | 0.9% |
| State House District 24 | Theresa Mah (Democratic) | 0.8% |
| State House District 5 | Kimberly Du Buclet (Democratic) | 0.7% |
| State House District 23 | Edgar González (Democratic) | 0.7% |
| State House District 26 | Kam Buckner (Democratic) | 0.7% |
| State House District 48 | Jennifer Sanalitro (Republican) | 0.7% |
| State House District 3 | Eva-Dina Delgado (Democratic) | 0.6% |
| State House District 4 | Lilian Jiménez (Democratic) | 0.6% |
| State House District 40 | Jaime Andrade (Democratic) | 0.6% |
| State House District 13 | Hoan Huynh (Democratic) | 0.5% |
| State House District 39 | Will Guzzardi (Democratic) | 0.5% |
| State House District 11 | Ann Williams (Democratic) | 0.4% |
| State House District 14 | Kelly Cassidy (Democratic) | 0.4% |
| State House District 58 | Bob Morgan (Democratic) | 0.4% |
| State House District 12 | Margaret Croke (Democratic) | 0.3% |
| State House District 79 | Jackie Haas (Republican) | 0.3% |
| State House District 59 | Dan Didech (Democratic) | 0.2% |
| State House District 45 | Marti Deuter (Democratic) | 0.1% |
Matched by district number using the U.S. Census Bureau 2020 county–district relationship files (land area overlap; districts may have been redrawn since). Your exact district depends on your address: U.S. House · state legislators.
County government
Find the official county website and contacts in the USA.gov local government directory or the National Association of Counties explorer.
Coming next for counties: county commission meetings and agendas, county budgets, local ballot measures and election results. We add each one as soon as a public, reliable feed exists for it. Know a good source? Tell us.
Sources: U.S. Census Bureau Gazetteer (county list, public domain); USAspending.gov (U.S. Treasury). Built 2026-11-03 15:28.