Boundary Atlas

California: cities, counties, ZIP codes and districts

California has 52 congressional districts, 40 state senate districts and 80 state house districts under the maps in force for November 3, 2026, plus 24,224 voting precincts, 58 counties, 1,619 cities, towns and Census-designated places, and 1,803 ZIP codes.

Cities and towns

Largest first. Each page lists the city's county, districts and ZIP codes.

Congressional districts (2026)

DistrictShort2020 population
California's 1st congressional districtCA-01765,487
California's 2nd congressional districtCA-02765,001
California's 3rd congressional districtCA-03763,291
California's 4th congressional districtCA-04758,116
California's 5th congressional districtCA-05770,847
California's 6th congressional districtCA-06757,442
California's 7th congressional districtCA-07758,734
California's 8th congressional districtCA-08764,945
California's 9th congressional districtCA-09762,401
California's 10th congressional districtCA-10759,118
California's 11th congressional districtCA-11759,192
California's 12th congressional districtCA-12758,548
California's 13th congressional districtCA-13758,808
California's 14th congressional districtCA-14760,582
California's 15th congressional districtCA-15759,058
California's 16th congressional districtCA-16758,780
California's 17th congressional districtCA-17758,885
California's 18th congressional districtCA-18770,826
California's 19th congressional districtCA-19758,545
California's 20th congressional districtCA-20762,909
California's 21st congressional districtCA-21756,411
California's 22nd congressional districtCA-22778,145
California's 23rd congressional districtCA-23769,312
California's 24th congressional districtCA-24764,734
California's 25th congressional districtCA-25763,761
California's 26th congressional districtCA-26758,413
California's 27th congressional districtCA-27760,129
California's 28th congressional districtCA-28758,019
California's 29th congressional districtCA-29757,430
California's 30th congressional districtCA-30758,223
California's 31st congressional districtCA-31758,733
California's 32nd congressional districtCA-32758,634
California's 33rd congressional districtCA-33757,177
California's 34th congressional districtCA-34757,694
California's 35th congressional districtCA-35765,081
California's 36th congressional districtCA-36758,224
California's 37th congressional districtCA-37755,317
California's 38th congressional districtCA-38757,523
California's 39th congressional districtCA-39756,504
California's 40th congressional districtCA-40758,355
California's 41st congressional districtCA-41757,743
California's 42nd congressional districtCA-42757,992
California's 43rd congressional districtCA-43754,875
California's 44th congressional districtCA-44757,709
California's 45th congressional districtCA-45758,321
California's 46th congressional districtCA-46757,683
California's 47th congressional districtCA-47759,243
California's 48th congressional districtCA-48758,048
California's 49th congressional districtCA-49758,652
California's 50th congressional districtCA-50759,364
California's 51st congressional districtCA-51758,012
California's 52nd congressional districtCA-52761,247

ZIP codes in California

Each page lists the ZIP's congressional and legislative districts, with population shares where it's split.

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Your agent can list, look up and map every district and precinct in California. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:

list_geographies(country="US", level="congressional_district", region="CA")