ZIP code 94028: Portola Valley, CA
ZIP code 94028 is in Portola Valley (65% of residents) and Ladera (23%), in San Mateo County (98%) and Santa Clara County (2.1%), California. 13% of its residents live outside city limits. It is in California's 16th congressional district. Its state senate district is State Senate District 13; its state house district is Assembly District 23.
See it on the mapAll of California
City and county
| City or town | Share of ZIP residents |
|---|---|
| Portola Valley | 65% |
| Ladera | 23% |
| Palo Alto | 0.4% |
| County | Share of ZIP residents |
|---|---|
| San Mateo County | 98% |
| Santa Clara County | 2.1% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| San Mateo CCD | 98% |
| West Santa Clara CCD | 2.1% |
Congressional district
| Congressional district | Share of ZIP residents |
|---|---|
| California's 16th congressional district (CA-16) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (CA-16) | Sam T. Liccardo (D) | 202-225-8104 | 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 13) | Josh Becker (Democratic) | 650-233-2724 | 100% |
| Assembly Member (Assembly District 23) | Marc Berman (Democratic) | 650-324-0224 | 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
- Portola Valley website: http://www.portolavalley.net
- Portola Valley laws: search for the Portola Valley, California code of ordinances
- Ladera laws: search for the Ladera, California code of ordinances
- San Mateo County website: https://smcgov.org
- San Mateo County laws: search for the San Mateo County, California code of ordinances
- Santa Clara County website: https://www.santaclaracounty.gov/
- Santa Clara County laws: search for the Santa Clara County, California code of ordinances
State legislative districts
| State senate district | Share of ZIP residents |
|---|---|
| State Senate District 13 | 100% |
| State house district | Share of ZIP residents |
|---|---|
| Assembly District 23 | 100% |
Voting precincts
9 voting precincts overlap ZIP 94028. 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:94028")
ZIP 94028 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.