Illinois's 1st congressional district (IL-01)
Illinois's 1st congressional district (IL-01) covers parts or all of Kankakee County, Will County and Cook County, and 51 ZIP codes (7 wholly inside it). Its 2020 population was 753,677. This is the map in force for the November 3, 2026 election.
Who represents IL-01
| Office | Member | Contact |
|---|---|---|
| U.S. Representative (IL-01) | Jonathan L. Jackson (D) | 202-225-4372 |
| U.S. Senator | Richard J. Durbin (D) | 202-224-2152 · contact form |
| U.S. Senator | Tammy Duckworth (D) | 202-224-2854 · contact form |
Officials serving now (members of Congress until January 3, 2027). Sources: Members of Congress: the @unitedstates project, congress-legislators (CC0).
Counties
| County | Share of the county's residents in IL-01 |
|---|---|
| Kankakee County | 34% |
| Will County | 29% |
| Cook County | 9.8% |
ZIP codes
Percentages mark ZIPs only partly in IL-01: the share of that ZIP's residents inside it.
- 60406 (73%)
- 60407 (35%)
- 60408
- 60410 (69%)
- 60416 (<0.1%)
- 60418 (16%)
- 60421 (0.8%)
- 60423 (100%)
- 60426 (8.9%)
- 60428 (29%)
- 60432 (12%)
- 60433 (4.5%)
- 60439 (51%)
- 60441 (61%)
- 60442 (100%)
- 60445 (98%)
- 60447 (17%)
- 60448
- 60449 (25%)
- 60451
- 60452 (50%)
- 60467 (53%)
- 60468 (16%)
- 60469
- 60472 (92%)
- 60477 (12%)
- 60478 (0.5%)
- 60481 (97%)
- 60487 (29%)
- 60491
- 60609 (1.6%)
- 60615 (49%)
- 60616 (30%)
- 60617 (41%)
- 60619
- 60620
- 60621 (47%)
- 60628 (64%)
- 60629 (5.2%)
- 60637 (77%)
- 60643 (79%)
- 60649 (38%)
- 60652 (63%)
- 60653 (61%)
- 60655 (6.1%)
- 60803 (37%)
- 60805 (34%)
- 60827 (28%)
- 60914 (79%)
- 60915 (24%)
- 60950 (98%)
Towns
Channahon township, Custer township, Florence township, Frankfort township, Green Garden township, Homer township, Manhattan township, New Lenox township, Reed township, Rockville township, Wesley township, Wilmington township, Wilton township, Manteno township, Bourbonnais township, Calumet township, Lemont township, Bremen township, Worth township, Peotone township, Chicago city, Lockport township, Orland township, Rich township, Troy township and Thornton township.
Get this in your AI agent
Your agent can draw every precinct in IL-01, or list them with population shares (related_geographies). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
get_boundaries(id="us:congressional_district:1701", children_level="precinct", include_districts=True)