South San Francisco, California
South San Francisco is a city in San Mateo County, California, with 66,105 residents in 2020. It is in California's 15th congressional district. It spans 2 state senate and 2 state house districts.
County
| County | Share of residents |
|---|---|
| San Mateo County | 100% |
Congressional district
| Congressional district | Share of residents |
|---|---|
| California's 15th congressional district (CA-15) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (CA-15) | Kevin Mullin (D) | 202-225-3531 | 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 | 50% |
| State Senator (State Senate District 11) | Scott Wiener (Democratic) | 415-557-1300 | 50% |
| Assembly Member (Assembly District 21) | Diane Papan (Democratic) | 650-349-2200 | 50% |
| Assembly Member (Assembly District 19) | Catherine Stefani (Democratic) | 415-557-2312 | 50% |
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
- South San Francisco website: http://www.ssf.net
- South San Francisco laws: search for the South San Francisco, 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 residents |
|---|---|
| State Senate District 13 | 50% |
| State Senate District 11 | 50% |
| State house district | Share of residents |
|---|---|
| Assembly District 21 | 50% |
| Assembly District 19 | 50% |
ZIP codes
Percentages mark ZIPs only partly in South San Francisco: the share of that ZIP's residents living in it.
Get this in your AI agent
Your agent can get South San Francisco's counties and districts with shares, its ZIP codes (level='zcta'), and its boundary as GeoJSON (get_boundaries). Add https://boundarymcp.com/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:place:0673262")
South San Francisco here is the Census Bureau's place boundary as of January 1, 2025. Shares are of 2020 Census population. Districts are the maps in force for the November 3, 2026 election.