Contra Costa County ZIP Codes
Contra Costa County is a county of California.
- ZIP codes
- 52
- Cities & towns
- 30
- Area codes
- 5
- Land area
- 717 sq mi
Every ZIP code in Contra Costa County
| ZIP code | City |
|---|---|
| 94505 | Discovery Bay |
| 94506 | Danville |
| 94507 | Alamo |
| 94509 | Antioch |
| 94511 | Bethel Island |
| 94513 | Brentwood |
| 94514 | Byron |
| 94516 | Canyon |
| 94517 | Clayton |
| 94518 | Concord |
| 94519 | Concord |
| 94520 | Concord |
| 94521 | Concord |
| 94522 | Concord |
| 94523 | Pleasant Hill |
| 94524 | Concord |
| 94525 | Crockett |
| 94526 | Danville |
| 94527 | Concord |
| 94528 | Diablo |
| 94529 | Concord |
| 94530 | El Cerrito |
| 94531 | Antioch |
| 94547 | Hercules |
| 94548 | Knightsen |
| 94549 | Lafayette |
| 94553 | Martinez |
| 94556 | Moraga |
| 94561 | Oakley |
| 94563 | Orinda |
| 94564 | Pinole |
| 94565 | Pittsburg |
| 94569 | Port Costa |
| 94570 | Moraga |
| 94572 | Rodeo |
| 94575 | Moraga |
| 94582 | San Ramon |
| 94583 | San Ramon |
| 94595 | Walnut Creek |
| 94596 | Walnut Creek |
| 94597 | Walnut Creek |
| 94598 | Walnut Creek |
| 94801 | Richmond |
| 94802 | Richmond |
| 94803 | El Sobrante |
| 94804 | Richmond |
| 94805 | Richmond |
| 94806 | San Pablo |
| 94807 | Richmond |
| 94808 | Richmond |
| 94820 | El Sobrante |
| 94850 | Richmond |
We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Contra Costa County codes above are listed without a column we would have to invent.
Cities and towns in Contra Costa County
A further 10 places in Contra Costa County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.
Area codes covering Contra Costa County
Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.
Where Contra Costa County's ZIP codes sit
- Reference points and footprint
- Not an official NANPA boundary
- Not a USPS delivery area
Scope every ZIP code recorded in Contra Costa County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated . The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.