43 ZIP Codes
| Zip Code | City | Population ↓ |
|---|---|---|
| 94565 | Pittsburg | 100,488 |
| 94509 | Antioch | 70,090 |
| 94513 | Brentwood | 69,755 |
| 94806 | San Pablo | 62,546 |
| 94553 | Martinez | 48,643 |
| 94582 | San Ramon | 47,424 |
| 94531 | Antioch | 46,387 |
| 94561 | Oakley | 46,368 |
| 94804 | Richmond | 44,891 |
| 94521 | Concord | 41,909 |
| 94583 | San Ramon | 39,583 |
| 94520 | Concord | 37,381 |
| 94523 | Pleasant Hill | 34,592 |
| 94801 | Richmond | 33,591 |
| 94526 | Danville | 32,584 |
| 94549 | Lafayette | 28,420 |
| 94803 | El Sobrante | 27,659 |
| 94518 | Concord | 27,345 |
| 94598 | Walnut Creek | 27,206 |
| 94506 | Danville | 27,055 |
| 94530 | El Cerrito | 26,401 |
| 94547 | Hercules | 26,302 |
| 94596 | Walnut Creek | 23,417 |
| 94597 | Walnut Creek | 23,129 |
| 94563 | Orinda | 19,378 |
| 94519 | Concord | 19,058 |
| 94564 | Pinole | 18,761 |
| 94595 | Walnut Creek | 16,988 |
| 94556 | Moraga | 15,998 |
| 94505 | Discovery Bay | 14,970 |
| 94805 | Richmond | 14,670 |
| 94507 | Alamo | 14,586 |
| 94517 | Clayton | 12,316 |
| 94708 | Berkeley | 11,947 |
| 94572 | Rodeo | 8,976 |
| 94525 | Crockett | 3,372 |
| 94514 | Byron | 1,953 |
| 94511 | Bethel Island | 1,864 |
| 94528 | Diablo | 1,049 |
| 94575 | Moraga | 975 |
| 94548 | Knightsen | 832 |
| 94569 | Port Costa | 296 |
| 94516 | Canyon | 214 |
The data shown reflect ZCTAs from the US Census. As of 2025, there are 43 ZCTAs in Contra Costa County, California (US Census).