California's 1st congressional district (CA-01)
California's 1st congressional district (CA-01) covers parts or all of 9 counties, including Butte County, Glenn County, Lassen County, Plumas County, Sierra County and Tehama County, and 132 ZIP codes (90 wholly inside it). Its 2020 population was 765,487. This is the map in force for the November 3, 2026 election.
Who represents CA-01
| Office | Member | Contact |
|---|---|---|
| U.S. Representative (CA-01) | James Gallagher (R) | 202-225-3076 |
| U.S. Senator | Adam B. Schiff (D) | 202-224-3841 |
| U.S. Senator | Alex Padilla (D) | 202-224-3553 · contact form |
Elected in 2024 under CA's previous congressional map; this district's lines changed for the 120th Congress (seated January 3, 2027).
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 CA-01 |
|---|---|
| Butte County | 100% |
| Glenn County | 100% |
| Lassen County | 100% |
| Plumas County | 100% |
| Sierra County | 100% |
| Tehama County | 100% |
| Lake County | 91% |
| Mendocino County | 69% |
| Sonoma County | 57% |
ZIP codes
Percentages mark ZIPs only partly in CA-01: the share of that ZIP's residents inside it.
- 89439 (8.3%)
- 94515 (1.5%)
- 95401
- 95403
- 95404 (90%)
- 95405
- 95407 (78%)
- 95409 (97%)
- 95415 (83%)
- 95422 (100%)
- 95423 (100%)
- 95425
- 95426 (81%)
- 95428
- 95429
- 95435
- 95436 (99%)
- 95437 (<0.1%)
- 95439
- 95441 (99%)
- 95443
- 95444
- 95446 (5.7%)
- 95448 (100%)
- 95449
- 95451
- 95453
- 95454 (38%)
- 95457 (49%)
- 95458
- 95461 (20%)
- 95464
- 95466 (26%)
- 95467 (69%)
- 95469
- 95470
- 95472 (56%)
- 95482
- 95485
- 95490 (99%)
- 95492
- 95493
- 95494 (66%)
- 95542 (1.4%)
- 95585 (43%)
- 95587 (81%)
- 95901 (1.0%)
- 95910
- 95913
- 95914 (83%)
- 95915
- 95916
- 95917
- 95920
- 95922 (1.2%)
- 95923
- 95926
- 95928
- 95929
- 95930 (91%)
- 95934
- 95936
- 95938
- 95939
- 95941 (76%)
- 95942
- 95943
- 95944
- 95947
- 95948 (100%)
- 95951
- 95954
- 95956
- 95958
- 95960 (23%)
- 95963
- 95965
- 95966 (100%)
- 95968
- 95969
- 95970 (36%)
- 95971
- 95973
- 95974
- 95978
- 95981 (50%)
- 95983
- 95984
- 95988
- 96006 (30%)
- 96009
- 96020
- 96021
- 96022 (53%)
- 96029
- 96035
- 96055
- 96056 (35%)
- 96059 (56%)
- 96061
- 96063
- 96068
- 96074
- 96075 (94%)
- 96076 (20%)
- 96078
- 96080
- 96090
- 96092
- 96103
- 96105
- 96106
- 96109
- 96110 (<0.1%)
- 96113
- 96114
- 96117
- 96118
- 96119
- 96121
- 96122
- 96123
- 96124
- 96125
- 96126
- 96128
- 96129
- 96130
- 96132
- 96135
- 96136
- 96137
Towns
Big Valley CCD, Biggs CCD, Chester CCD, Chico CCD, Clearlake Riviera CCD, Corning CCD, Covelo CCD, Durham CCD, East Sierra CCD, East Tehama CCD, Feather Falls CCD, Feather River Canyon CCD, Graeagle CCD, Greenville CCD, Gridley CCD, Healdsburg CCD, Honey Lake CCD, Hopland CCD, Kelseyville CCD, Lakeport CCD, Lucerne-Clearlake Oaks CCD, Madeline Plains CCD, Orland CCD, Oroville CCD, Palermo CCD, Paradise CCD, Portola CCD, Quincy CCD, Red Bluff CCD, Redwood Valley-Potter Valley CCD, Susanville CCD, Ukiah CCD, Upper Lake-Nice CCD, West Sierra CCD, West Tehama CCD, Westwood CCD, Willows CCD, Clearlake CCD, Willits CCD and Cloverdale-Geyserville CCD and others.
Get this in your AI agent
Your agent can draw every precinct in CA-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:0601", children_level="precinct", include_districts=True)