ZIP code 94503: American Canyon, CA
ZIP code 94503 is in American Canyon (99% of residents), in Napa County (100%) and Solano County (0.4%), California. It is in California's 4th congressional district (100%) and California's 8th congressional district (0.4%). Its state senate district is State Senate District 3; its state house districts are Assembly District 4 (100%) and Assembly District 11 (0.4%).
See it on the mapAll of California
City and county
| City or town | Share of ZIP residents |
|---|---|
| American Canyon | 99% |
| County | Share of ZIP residents |
|---|---|
| Napa County | 100% |
| Solano County | 0.4% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Napa CCD | 100% |
| Fairfield-Suisun City CCD | 0.4% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| California's 4th congressional district (CA-04) | 100% |
| California's 8th congressional district (CA-08) | 0.4% |
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.
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (CA-04) | Mike Thompson (D) | 202-225-3311 | 100% |
| U.S. Representative (CA-08) | John Garamendi (D) | 202-225-1880 | 0.4% |
| U.S. Senator | Adam B. Schiff (D) | 202-224-3841 | statewide |
| U.S. Senator | Alex Padilla (D) | 202-224-3553 · contact form | statewide |
| State Senator (State Senate District 3) | Christopher Cabaldon (Democratic) | 707-454-3808 | 100% |
| Assembly Member (Assembly District 4) | Cecilia Aguiar-Curry (Democratic) | 530-757-1034 | 100% |
| Assembly Member (Assembly District 11) | Lori Wilson (Democratic) | 707-438-7359 | 0.4% |
Elected in 2024 under CA's previous congressional map; this district's lines changed for the 120th Congress (seated January 3, 2027).
Officials serving now (members of Congress until January 3, 2027). Sources: State legislators: Open States (public domain); Members of Congress: the @unitedstates project, congress-legislators (CC0).
Local government
- American Canyon website: http://www.cityofamericancanyon.org
- American Canyon laws: search for the American Canyon, California code of ordinances
- Napa County website: https://www.napacounty.gov/
- Napa County laws: search for the Napa County, California code of ordinances
- Solano County website: https://www.solanocounty.gov/
- Solano County laws: search for the Solano County, California code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 3 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| Assembly District 4 | 100% |
| Assembly District 11 | 0.4% |
Voting precincts
26 voting precincts overlap ZIP 94503. 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:94503")
ZIP 94503 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.