Boundary Atlas

ZIP code 91304: Los Angeles, CA

ZIP code 91304 is in Los Angeles (97% of residents), in Los Angeles County (100%) and Ventura County (0.5%), California. It is in California's 32nd congressional district (84%) and California's 26th congressional district (16%). Its state senate districts are State Senate District 20 (64%) and State Senate District 27 (36%); its state house districts are Assembly District 46 (100%) and Assembly District 42 (0.5%).

52,386residents (2020 Census)
9.7 sq miland area
1cities and towns
2congressional districts
16voting precincts

See it on the mapAll of California

City and county

City or townShare of ZIP residents
Los Angeles97%

CountyShare of ZIP residents
Los Angeles County100%
Ventura County0.5%

Town or county subdivisionShare of ZIP residents
San Fernando Valley CCD100%
Simi Valley CCD0.5%

Congressional districts

Congressional districtShare of ZIP residents
California's 32nd congressional district (CA-32)84%
California's 26th congressional district (CA-26)16%

This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.

State legislative districts

State senate districtShare of ZIP residents
State Senate District 2064%
State Senate District 2736%

State house districtShare of ZIP residents
Assembly District 46100%
Assembly District 420.5%

Voting precincts

16 voting precincts overlap ZIP 91304. Map them, with each precinct's share of the ZIP's residents.

Get this in your AI agent

Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:

related_geographies(id="us:zcta:91304")

ZIP 91304 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.