Walnut Creek, California
Walnut Creek is a city in Contra Costa County, California, with 70,127 residents in 2020. It is in California's 10th congressional district. It spans 2 state house districts. Its state senate district is State Senate District 9.
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 16) | Rebecca Bauer-Kahan (Democratic) | 925-244-1600 | 100% |
| Assembly Member (Assembly District 15) | Anamarie Avila Farias (Democratic) | 925-521-1511 | 0.5% |
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
- Walnut Creek laws: search for the Walnut Creek, 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 16 | 100% |
| Assembly District 15 | 0.5% |
ZIP codes
Percentages mark ZIPs only partly in Walnut Creek: the share of that ZIP's residents living in it.
Get this in your AI agent
Your agent can get Walnut Creek'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:0683346")
Walnut Creek 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.