ZIP code 95409: Santa Rosa, CA
ZIP code 95409 is in Santa Rosa (94% of residents), in Sonoma County, California. 5.8% of its residents live outside city limits. It is in California's 1st congressional district (97%) and California's 4th congressional district (2.8%). Its state senate district is State Senate District 2; its state house districts are Assembly District 2 (69%) and Assembly District 12 (31%).
See it on the mapAll of California
City and county
| City or town | Share of ZIP residents |
|---|---|
| Santa Rosa | 94% |
| County | Share of ZIP residents |
|---|---|
| Sonoma County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Santa Rosa CCD | 100% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| California's 1st congressional district (CA-01) | 97% |
| California's 4th congressional district (CA-04) | 2.8% |
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 2 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| Assembly District 2 | 69% |
| Assembly District 12 | 31% |
Voting precincts
37 voting precincts overlap ZIP 95409. 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:95409")
ZIP 95409 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.