Chicago, Illinois
Chicago is a city in Cook County, Illinois, with 2,746,388 residents in 2020. It spans 9 congressional districts: IL-07 (22%), IL-05 (17%), IL-03 (16%), IL-01 (15%), IL-04 (14%), IL-09 (9.3%), IL-02 (5.0%), IL-06 (2.5%) and IL-08 (0.4%). It spans 21 state senate and 36 state house districts.
County
| County | Share of residents |
|---|---|
| Cook County | 100% |
Congressional districts
| Congressional district | Share of residents |
|---|---|
| Illinois's 7th congressional district (IL-07) | 22% |
| Illinois's 5th congressional district (IL-05) | 17% |
| Illinois's 3rd congressional district (IL-03) | 16% |
| Illinois's 1st congressional district (IL-01) | 15% |
| Illinois's 4th congressional district (IL-04) | 14% |
| Illinois's 9th congressional district (IL-09) | 9.3% |
| Illinois's 2nd congressional district (IL-02) | 5.0% |
| Illinois's 6th congressional district (IL-06) | 2.5% |
| Illinois's 8th congressional district (IL-08) | 0.4% |
State legislative districts
| State senate district | Share of residents |
|---|---|
| State Senate District 6 | 7.9% |
| State Senate District 2 | 7.9% |
| State Senate District 3 | 7.9% |
| State Senate District 5 | 7.9% |
| State Senate District 7 | 7.9% |
| State Senate District 13 | 7.9% |
| State Senate District 20 | 7.9% |
| State Senate District 12 | 7.5% |
| State Senate District 10 | 6.1% |
| State Senate District 16 | 5.4% |
| State Senate District 8 | 4.6% |
| State Senate District 17 | 4.3% |
| State Senate District 1 | 3.8% |
| State Senate District 11 | 3.4% |
| State Senate District 14 | 2.9% |
| State Senate District 4 | 2.3% |
| State Senate District 18 | 2.1% |
| State Senate District 39 | 1.2% |
| State Senate District 28 | 0.4% |
| State Senate District 15 | 0.4% |
| State Senate District 9 | 0.2% |
| State house district | Share of residents |
|---|---|
| State House District 3 | 4.0% |
| State House District 5 | 4.0% |
| State House District 6 | 4.0% |
| State House District 9 | 4.0% |
| State House District 10 | 4.0% |
| State House District 11 | 4.0% |
| State House District 12 | 4.0% |
| State House District 13 | 4.0% |
| State House District 26 | 4.0% |
| State House District 40 | 4.0% |
| State House District 4 | 4.0% |
| State House District 14 | 4.0% |
| State House District 24 | 4.0% |
| State House District 25 | 4.0% |
| State House District 39 | 4.0% |
| State House District 1 | 3.8% |
| State House District 19 | 3.8% |
| State House District 23 | 3.6% |
| State House District 32 | 3.3% |
| State House District 22 | 3.2% |
| State House District 33 | 2.5% |
| State House District 15 | 2.3% |
| State House District 20 | 2.3% |
| State House District 8 | 2.3% |
| State House District 16 | 2.2% |
| State House District 31 | 2.1% |
| State House District 27 | 2.1% |
| State House District 34 | 1.8% |
| State House District 35 | 1.7% |
| State House District 78 | 1.2% |
| State House District 28 | 0.8% |
| State House District 36 | 0.4% |
| State House District 55 | 0.4% |
| State House District 29 | 0.4% |
| State House District 18 | 0.2% |
| State House District 21 | 0.2% |
ZIP codes
Percentages mark ZIPs only partly in Chicago: the share of that ZIP's residents living in it.
- 60601
- 60602
- 60603
- 60604
- 60605
- 60606
- 60607
- 60608
- 60609
- 60610
- 60611
- 60612
- 60613
- 60614
- 60615
- 60616
- 60617
- 60618
- 60619
- 60620
- 60621
- 60622
- 60623
- 60624
- 60625
- 60626
- 60628
- 60629
- 60630
- 60631 (99%)
- 60632
- 60633 (70%)
- 60634
- 60636
- 60637
- 60638 (93%)
- 60639
- 60640
- 60641
- 60642
- 60643
- 60644
- 60645
- 60646
- 60647
- 60649
- 60651
- 60652
- 60653
- 60654
- 60655
- 60656 (98%)
- 60657
- 60659
- 60660
- 60661
- 60707 (43%)
- 60827 (29%)
Get this in your AI agent
Your agent can get Chicago's counties and districts with shares, its ZIP codes (level='zcta'), and its boundary as GeoJSON (get_boundaries). Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:place:1714000")
Chicago here is the Census Bureau's place boundary as of January 1, 2025. Shares are of 2020 Census population. Districts are the maps in force for the November 3, 2026 election.