Indiana's 1st congressional district (IN-01)
Indiana's 1st congressional district (IN-01) covers parts or all of Lake County, Porter County and LaPorte County, and 42 ZIP codes (36 wholly inside it). Its 2020 population was 753,947. This is the map in force for the November 3, 2026 election.
Who represents IN-01
| Office | Member | Contact |
|---|---|---|
| U.S. Representative (IN-01) | Frank J. Mrvan (D) | 202-225-2461 |
| U.S. Senator | Jim Banks (R) | 202-224-4814 |
| U.S. Senator | Todd Young (R) | 202-224-5623 · 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 IN-01 |
|---|---|
| Lake County | 100% |
| Porter County | 100% |
| LaPorte County | 73% |
ZIP codes
Percentages mark ZIPs only partly in IN-01: the share of that ZIP's residents inside it.
- 46301
- 46302
- 46303
- 46304
- 46307
- 46311
- 46312
- 46319
- 46320
- 46321
- 46322
- 46323
- 46324
- 46327
- 46341 (99%)
- 46342
- 46347
- 46348 (0.5%)
- 46350 (72%)
- 46356
- 46360
- 46368
- 46373
- 46375
- 46376
- 46377
- 46382 (3.3%)
- 46383
- 46385
- 46390 (0.3%)
- 46391 (98%)
- 46393
- 46394
- 46402
- 46403
- 46404
- 46405
- 46406
- 46407
- 46408
- 46409
- 46410
Towns
Boone township, Calumet township, Cedar Creek township, Center township, Center township, Coolspring township, Eagle Creek township, Hanover township, Hobart township, Jackson township, Liberty township, Michigan township, Morgan township, New Durham township, North township, Pine township, Pleasant township, Portage township, Porter township, Ross township, Scipio township, Springfield township, St. John township, Union township, Washington township, West Creek township, Westchester township, Winfield township and Center township.
Get this in your AI agent
Your agent can draw every precinct in IN-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:1801", children_level="precinct", include_districts=True)