Illinois's 3rd congressional district (IL-03)
Illinois's 3rd congressional district (IL-03) covers parts or all of DuPage County and Cook County, and 38 ZIP codes (2 wholly inside it). Its 2020 population was 753,677. This is the map in force for the November 3, 2026 election.
Who represents IL-03
| Office | Member | Contact |
|---|---|---|
| U.S. Representative (IL-03) | Delia C. Ramirez (D) | 202-225-5701 |
| 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-03 |
|---|---|
| DuPage County | 21% |
| Cook County | 11% |
ZIP codes
Percentages mark ZIPs only partly in IL-03: the share of that ZIP's residents inside it.
- 60005 (4.0%)
- 60007 (3.4%)
- 60018 (24%)
- 60056 (9.9%)
- 60101 (65%)
- 60103 (66%)
- 60106
- 60107 (20%)
- 60120 (37%)
- 60131 (28%)
- 60133 (27%)
- 60137 (28%)
- 60139 (55%)
- 60148 (4.9%)
- 60171 (63%)
- 60174 (1.9%)
- 60176 (52%)
- 60181 (4.5%)
- 60184 (65%)
- 60185 (99%)
- 60187 (82%)
- 60188 (8.1%)
- 60189 (49%)
- 60190
- 60191 (36%)
- 60510 (0.3%)
- 60555 (62%)
- 60563 (0.3%)
- 60618 (69%)
- 60622 (28%)
- 60625 (49%)
- 60630 (18%)
- 60634 (94%)
- 60639 (87%)
- 60641 (85%)
- 60647 (84%)
- 60651 (49%)
- 60707 (85%)
Towns
Chicago city, Winfield township, Addison township, Hanover township, Milton township, Leyden township, Wayne township, Bloomingdale township, Chicago city, Elk Grove township, Maine township and York township.
Get this in your AI agent
Your agent can draw every precinct in IL-03, 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:1703", children_level="precinct", include_districts=True)