Boundary Atlas

ZIP code 94591: Vallejo, CA

ZIP code 94591 is in Vallejo (97% of residents), in Solano County (100%) and Napa County (<0.1%), California. It is in California's 8th congressional district. Its state senate district is State Senate District 3; its state house district is Assembly District 11.

56,305residents (2020 Census)
21.1 sq miland area
1cities and towns
1congressional district
28voting precincts

See it on the mapAll of California

City and county

City or townShare of ZIP residents
Vallejo97%

CountyShare of ZIP residents
Solano County100%
Napa Countyland only

Town or county subdivisionShare of ZIP residents
Vallejo CCD96%
Fairfield-Suisun City CCD3.9%
Napa CCDland only

Congressional district

Congressional districtShare of ZIP residents
California's 8th congressional district (CA-08)100%
California's 4th congressional district (CA-04)land only

State legislative districts

State senate districtShare of ZIP residents
State Senate District 3100%

State house districtShare of ZIP residents
Assembly District 11100%
Assembly District 4land only

Voting precincts

28 voting precincts overlap ZIP 94591. 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:94591")

ZIP 94591 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.