Boundary Atlas

ZIP code 91024: Sierra Madre, CA

ZIP code 91024 is in Sierra Madre, in Los Angeles County, California. It is in California's 28th congressional district. Its state senate district is State Senate District 25; its state house district is Assembly District 41.

11,268residents (2020 Census)
3.5 sq miland area
1cities and towns
1congressional district
5voting precincts

See it on the mapAll of California

City and county

City or townShare of ZIP residents
Sierra Madre100%

CountyShare of ZIP residents
Los Angeles County100%

Town or county subdivisionShare of ZIP residents
Upper San Gabriel Valley CCD100%
South Antelope Valley CCDland only

Congressional district

Congressional districtShare of ZIP residents
California's 28th congressional district (CA-28)100%

State legislative districts

State senate districtShare of ZIP residents
State Senate District 25100%

State house districtShare of ZIP residents
Assembly District 41100%
Assembly District 49land only

Voting precincts

5 voting precincts overlap ZIP 91024. Map them, with each precinct's share of the ZIP's residents.

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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:91024")

ZIP 91024 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.