ZIP code 94027: Atherton, CA
ZIP code 94027 is in Atherton (99% of residents), in San Mateo County, California. It is in California's 16th congressional district (97%) and California's 15th congressional district (2.7%). Its state senate district is State Senate District 13; its state house districts are Assembly District 23 (97%) and Assembly District 21 (2.7%).
See it on the mapAll of California
City and county
| City or town | Share of ZIP residents |
|---|---|
| Atherton | 99% |
| West Menlo Park | 0.4% |
| County | Share of ZIP residents |
|---|---|
| San Mateo County | 100% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| San Mateo CCD | 100% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| California's 16th congressional district (CA-16) | 97% |
| California's 15th congressional district (CA-15) | 2.7% |
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-16) | Sam T. Liccardo (D) | 202-225-8104 | 97% |
| U.S. Representative (CA-15) | Kevin Mullin (D) | 202-225-3531 | 2.7% |
| 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 | 97% |
| Assembly Member (Assembly District 21) | Diane Papan (Democratic) | 650-349-2200 | 2.7% |
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
- Atherton website: http://www.ci.atherton.ca.us
- Atherton laws: search for the Atherton, 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
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 | 97% |
| Assembly District 21 | 2.7% |
Voting precincts
6 voting precincts overlap ZIP 94027. 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:94027")
ZIP 94027 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.