Clayton, California
Clayton is a city in Contra Costa County, California, with 11,070 residents in 2020. It is in California's 10th congressional district. Its state senate district is State Senate District 9; its state house district is Assembly District 15.
County
| County | Share of residents |
|---|---|
| Contra Costa County | 100% |
Congressional district
| Congressional district | Share of residents |
|---|---|
| California's 10th congressional district (CA-10) | 100% |
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (CA-10) | Mark DeSaulnier (D) | 202-225-2095 | 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 9) | Tim Grayson (Democratic) | 925-258-1176 | 100% |
| Assembly Member (Assembly District 15) | Anamarie Avila Farias (Democratic) | 925-521-1511 | 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
- Clayton website: https://claytonca.gov/
- Clayton laws: search for the Clayton, California code of ordinances
- Contra Costa County website: https://www.contracosta.ca.gov/
- Contra Costa County laws: search for the Contra Costa 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 15 | 100% |
ZIP codes
Percentages mark ZIPs only partly in Clayton: the share of that ZIP's residents living in it.
- 94517 (88%)
Get this in your AI agent
Your agent can get Clayton'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:0613882")
Clayton 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.