Millbrae, California
Millbrae is a city in San Mateo County, California, with 23,216 residents in 2020. It is in California's 15th congressional district. Its state senate district is State Senate District 13; its state house district is Assembly District 21.
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 | 100% |
| Assembly Member (Assembly District 21) | Diane Papan (Democratic) | 650-349-2200 | 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
- Millbrae website: https://www.ci.millbrae.ca.us
- Millbrae laws: search for the Millbrae, 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 | 100% |
| State house district | Share of residents |
|---|---|
| Assembly District 21 | 100% |
ZIP codes
Percentages mark ZIPs only partly in Millbrae: the share of that ZIP's residents living in it.
Get this in your AI agent
Your agent can get Millbrae's counties and districts with shares, its ZIP codes (level='zcta'), and its boundary as GeoJSON (get_boundaries). Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:place:0647486")
Millbrae 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.