California / CA-01
California District 1
Score
Irregularity score 69 IrregularLess compact than 74% of other congressional districts.
111th least compact of 429 nationally, 29th of 52 in California.
A score describes shape, not intent. Coastlines, rivers and the Voting Rights Act can all make a district irregular. How scores work
The three measures
- Polsby-Popper
- 0.20at least as compact as 35% of districts on this measure
Area compared with perimeter. Low for jagged or snaking edges.
- Reock
- 0.43at least as compact as 34% of districts on this measure
Area compared with the smallest circle around the district, counting only land. Low for stretched shapes.
- Convex hull
- 0.68at least as compact as 24% of districts on this measure
Area compared with a rubber band stretched around the district, counting only land. Low for bites and tentacles.
Each measure runs from 0 to 1, where 1 is a perfect circle or a shape with no dents.
The state's edge
11% of this district's border is the state's edge: a coastline, a national border or a state line. Mapmakers don't choose those lines. A ragged one, like a coastline or a river, lowers Polsby-Popper. Reock and convex hull count only the state's own land, so water and neighboring states don't count against them. More on the state's edge
New lines for 2026
California used a different map in the 2026 election than in 2024: the 2025 Proposition 50 map (legislature-drawn; voter-approved). Source: California Secretary of State
Cities and towns
The largest places with people in this district, from the 2020 Census. A place split between districts shows how many of its residents live in this one.
- Santa Rosa cityall 178,127 residents
- Chico cityall 101,475 residents
- Windsor townall 26,344 residents
- Oroville cityall 20,042 residents
- Susanville cityall 16,728 residents
- Clearlake cityall 16,685 residents
- Ukiah cityall 16,607 residents
- Red Bluff cityall 14,710 residents
- Healdsburg cityall 11,340 residents
- Cloverdale cityall 8,996 residents
And 150 smaller places. 20% of this district's people live outside any city, town or named community. How places are counted
ZIP codes
129 ZIP codes have residents in this district. 41 of them are split with other districts. A percentage is the share of that ZIP code's 2020 residents who live here.
Show all 129 ZIP codes
- 89439 (8%)
- 94515 (1%)
- 95401
- 95403
- 95404 (90%)
- 95405
- 95407 (78%)
- 95409 (97%)
- 95415 (83%)
- 95422 (99%)
- 95423 (99%)
- 95425
- 95426 (80%)
- 95428
- 95429
- 95435
- 95436 (99%)
- 95439
- 95441 (99%)
- 95443
- 95444
- 95446 (6%)
- 95448 (99%)
- 95449
- 95451
- 95453
- 95454 (38%)
- 95457 (49%)
- 95458
- 95461 (20%)
- 95464
- 95466 (26%)
- 95467 (69%)
- 95469
- 95470
- 95472 (56%)
- 95482 (99%)
- 95485
- 95490 (99%)
- 95492
- 95493
- 95494 (66%)
- 95542 (1%)
- 95585 (43%)
- 95587 (81%)
- 95901 (1%)
- 95910
- 95913
- 95914 (83%)
- 95915
- 95916
- 95917
- 95920
- 95922 (1%)
- 95923
- 95926
- 95928
- 95930 (91%)
- 95934
- 95936
- 95938
- 95939
- 95941 (76%)
- 95942
- 95943
- 95944
- 95947
- 95948 (99%)
- 95951
- 95954
- 95956
- 95958
- 95960 (23%)
- 95963
- 95965
- 95966 (99%)
- 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
- 96113
- 96114
- 96117
- 96118
- 96119
- 96121
- 96122
- 96123
- 96124
- 96125
- 96126
- 96128
- 96129
- 96130
- 96132
- 96135
- 96136
- 96137
These are the Census Bureau's ZIP code areas, which match residential ZIP codes closely. ZIP codes used only for PO boxes or a single organization aren't included. How ZIP codes are matched
2024 presidential vote
California drew new lines for 2026, and no 2024 results have been published for them. Where the votes come from
U.S. House
Mike McGuire, Democrat
Elected November 3, 2026, takes office January 3, 2027.
Unofficial results from the California Secretary of State, checked November 6, 2026. A race shows a winner once news decision desks have called it. Results become official when the state certifies them. Where this comes from
California's senators
- Alex Padilla, Democrat
- Adam B. Schiff, Democrat
Senators are elected by the whole state, so district lines don't change who they are. Senators serving as of November 6, 2026. Senators elected in November 2026 take office January 3, 2027. Where this comes from
Where it sits in California
- Very compact (0 to 19)
- Compact (20 to 39)
- Middle (40 to 59)
- Irregular (60 to 79)
- Very irregular (80 to 100)
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