ZIP code 94505: Discovery Bay, CA
ZIP code 94505 is in Discovery Bay (99% of residents), in Contra Costa County (100%) and Alameda County (0.4%), California. It is in California's 10th congressional district (100%) and California's 14th congressional district (0.4%). Its state senate districts are State Senate District 3 (100%) and State Senate District 5 (0.4%); its state house districts are Assembly District 11 (99%), Assembly District 16 (0.4%) and Assembly District 15 (0.1%).
See it on the mapAll of California
City and county
| City or town | Share of ZIP residents |
|---|---|
| Discovery Bay | 99% |
| County | Share of ZIP residents |
|---|---|
| Contra Costa County | 100% |
| Alameda County | 0.4% |
| Town or county subdivision | Share of ZIP residents |
|---|---|
| East Contra Costa CCD | 100% |
| Livermore-Pleasanton CCD | 0.4% |
Congressional districts
| Congressional district | Share of ZIP residents |
|---|---|
| California's 10th congressional district (CA-10) | 100% |
| California's 14th congressional district (CA-14) | 0.4% |
This ZIP is split between districts. A mailing address in it could be in either; the map or locate_point gives the district for an exact address.
Elected officials
| Office | Member | Contact | Share of residents |
|---|---|---|---|
| U.S. Representative (CA-10) | Mark DeSaulnier (D) | 202-225-2095 | 100% |
| U.S. Representative (CA-14) | Aisha Wahab (D) | 202-225-5065 | 0.4% |
| 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 3) | Christopher Cabaldon (Democratic) | 707-454-3808 | 100% |
| State Senator (State Senate District 5) | Jerry McNerney (Democratic) | 209-472-9535 | 0.4% |
| Assembly Member (Assembly District 11) | Lori Wilson (Democratic) | 707-438-7359 | 99% |
| Assembly Member (Assembly District 16) | Rebecca Bauer-Kahan (Democratic) | 925-244-1600 | 0.4% |
| Assembly Member (Assembly District 15) | Anamarie Avila Farias (Democratic) | 925-521-1511 | 0.1% |
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
- Discovery Bay website: https://www.todb.ca.gov/
- Discovery Bay laws: search for the Discovery Bay, 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
- 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 ZIP residents |
|---|---|
| State Senate District 3 | 100% |
| State Senate District 5 | 0.4% |
| State house district | Share of ZIP residents |
|---|---|
| Assembly District 11 | 99% |
| Assembly District 16 | 0.4% |
| Assembly District 15 | 0.1% |
Voting precincts
15 voting precincts overlap ZIP 94505. Map them, with each precinct's share of the ZIP's residents.
Get this in your AI agent
Your agent can get these cities, counties, districts and precincts with their shares, and their GeoJSON boundaries, from Boundary Atlas. Add https://atlas-production-d344.up.railway.app/mcp to Claude, ChatGPT, Cursor or Codex (free, no key; how), then:
related_geographies(id="us:zcta:94505")
ZIP 94505 here is the Census Bureau's ZIP Code Tabulation Area, which approximates the USPS ZIP Code; PO-box-only ZIPs have none. Districts are the maps in force for the November 3, 2026 election.