ZIP code 90403: Santa Monica, CA
ZIP code 90403 is in Santa Monica, in Los Angeles County, California. It is in California's 36th congressional district (100%) and California's 32nd congressional district (<0.1%). Its state senate district is State Senate District 24; its state house districts are Assembly District 51 (100%) and Assembly District 42 (<0.1%).
See it on the mapAll of California
City and county
| City or town | Share of ZIP residents |
|---|---|
| Santa Monica | 100% |
| Los Angeles | <0.1% |
| County | Share of ZIP residents |
|---|---|
| Los Angeles County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Santa Monica CCD | 100% |
| Los Angeles CCD | <0.1% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| California's 36th congressional district (CA-36) | 100% |
| California's 32nd congressional district (CA-32) | <0.1% |
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 district | Share of ZIP residents |
|---|---|
| State Senate District 24 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| Assembly District 51 | 100% |
| Assembly District 42 | <0.1% |
Voting precincts
8 voting precincts overlap ZIP 90403. 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:90403")
ZIP 90403 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.