43 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 94565 | Pittsburg | 99,933 |
| 94509 | Antioch | 71,013 |
| 94513 | Brentwood | 68,160 |
| 94806 | San Pablo | 61,749 |
| 94553 | Martinez | 48,600 |
| 94582 | San Ramon | 47,182 |
| 94561 | Oakley | 45,386 |
| 94531 | Antioch | 44,746 |
| 94804 | Richmond | 44,679 |
| 94521 | Concord | 41,118 |
| 94583 | San Ramon | 39,418 |
| 94520 | Concord | 36,767 |
| 94523 | Pleasant Hill | 34,789 |
| 94801 | Richmond | 33,564 |
| 94526 | Danville | 33,085 |
| 94549 | Lafayette | 28,247 |
| 94518 | Concord | 27,743 |
| 94803 | El Sobrante | 27,588 |
| 94506 | Danville | 27,261 |
| 94598 | Walnut Creek | 26,293 |
| 94547 | Hercules | 26,245 |
| 94530 | El Cerrito | 26,229 |
| 94597 | Walnut Creek | 24,235 |
| 94596 | Walnut Creek | 23,592 |
| 94519 | Concord | 19,918 |
| 94563 | Orinda | 19,409 |
| 94564 | Pinole | 18,835 |
| 94595 | Walnut Creek | 17,051 |
| 94556 | Moraga | 15,922 |
| 94805 | Richmond | 15,356 |
| 94505 | Discovery Bay | 15,316 |
| 94507 | Alamo | 14,546 |
| 94517 | Clayton | 12,164 |
| 94708 | Berkeley | 11,967 |
| 94572 | Rodeo | 8,712 |
| 94525 | Crockett | 3,665 |
| 94511 | Bethel Island | 2,144 |
| 94514 | Byron | 2,044 |
| 94575 | Moraga | 1,005 |
| 94528 | Diablo | 1,000 |
| 94548 | Knightsen | 637 |
| 94516 | Canyon | 208 |
| 94569 | Port Costa | 194 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 43 ZCTAs in Contra Costa County, California (US Census).