Castro Valley, California
Castro Valley is a Census-designated place (an unincorporated community) in Alameda County, California, with 66,441 residents in 2020. It spans 2 congressional districts: CA-10 (79%) and CA-14 (21%). Its state senate district is State Senate District 9; its state house district is Assembly District 20.
County
| County | Share of residents |
|---|---|
| Alameda County | 100% |
Congressional districts
| Congressional district | Share of residents |
|---|---|
| California's 10th congressional district (CA-10) | 79% |
| California's 14th congressional district (CA-14) | 21% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (CA-10) | Mark DeSaulnier (D) | 202-225-2095 | 79% |
| U.S. Representative (CA-14) | Aisha Wahab (D) | 202-225-5065 | 21% |
| 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 9) | Tim Grayson (Democratic) | 925-258-1176 | 100% |
| Assembly Member (Assembly District 20) | Liz Ortega (Democratic) | 510-583-8818 | 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
- Castro Valley laws: search for the Castro Valley, California code of ordinances
- Alameda County website: https://www.acgov.org/
- Alameda County laws: search for the Alameda County, California code of ordinances
State legislative districts
| State senate district | Share of residents |
|---|---|
| State Senate District 9 | 100% |
| State house district | Share of residents |
|---|---|
| Assembly District 20 | 100% |
ZIP codes
Percentages mark ZIPs only partly in Castro Valley: the share of that ZIP's residents living in it.
Get this in your AI agent
Your agent can get Castro Valley'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:0611964")
Castro Valley here is the Census Bureau's place boundary as of January 1, 2025 (a Census-designated place, which has no municipal government). Shares are of 2020 Census population. Districts are the maps in force for the November 3, 2026 election.