ZIP code 94558: Napa, CA
ZIP code 94558 is in Napa (81% of residents) and Silverado Resort (1.5%), in Napa County, California. 17% of its residents live outside city limits. It is in California's 4th congressional district. Its state senate district is State Senate District 3; its state house district is Assembly District 4.
See it on the mapAll of California
City and county
| City or town | Share of ZIP residents |
|---|---|
| Napa | 81% |
| Silverado Resort | 1.5% |
| Moskowite Corner | 0.4% |
| Oakville | <0.1% |
| County | Share of ZIP residents |
|---|---|
| Napa County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| Napa CCD | 98% |
| Lake Berryessa CCD | 1.7% |
| St. Helena CCD | 0.5% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| California's 4th congressional district (CA-04) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (CA-04) | Mike Thompson (D) | 202-225-3311 | 100% |
| 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% |
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
- Napa website: http://www.cityofnapa.org
- Napa laws: search for the Napa, California code of ordinances
- Silverado Resort website: http://www.silveradoresort.com
- Silverado Resort laws: search for the Silverado Resort, California code of ordinances
- Napa County website: https://www.napacounty.gov/
- Napa County laws: search for the Napa 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% |
Voting precincts
99 voting precincts overlap ZIP 94558. 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:94558")
ZIP 94558 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.