Contra Costa County, California
43 ZIP codes · 716.9 sq mi of land · FIPS 06013
| Population | 1,165,012 |
|---|---|
| State | California |
| FIPS code | 06013 |
| Time zone | Pacific |
| Land area | 716.9 sq mi |
| Center (lat, long) | 37.9195, -121.9515 |
Area codes in this area
These are the area codes that most often serve Contra Costa County (including overlays). The exact area code depends on the phone number — landlines, mobiles and overlays can differ even on the same street.
Cities and towns (largest first)
Concord · 124,035Berkeley · 120,257Antioch · 116,477Richmond · 115,505San Ramon · 85,993Pittsburg · 76,257Walnut Creek · 70,088Brentwood · 65,208Oakley · 45,183Danville · 43,401Martinez · 36,903Pleasant Hill · 34,235San Pablo · 31,720Hercules · 26,302El Cerrito · 25,994Lafayette · 25,285Orinda · 19,514Pinole · 18,761Moraga · 16,769El Sobrante · 16,294Discovery Bay · 14,911Alamo · 14,488Bethel IslandByronCanyonClaytonCrockettDiabloKnightsenPort Costa
ZIP codes in Contra Costa County
94505 Discovery Bay94506 Danville94507 Alamo94509 Antioch94511 Bethel Island94513 Brentwood94514 Byron94516 Canyon94517 Clayton94518 Concord94519 Concord94520 Concord94521 Concord94523 Pleasant Hill94525 Crockett94526 Danville94528 Diablo94530 El Cerrito94531 Antioch94547 Hercules94548 Knightsen94549 Lafayette94553 Martinez94556 Moraga94561 Oakley94563 Orinda94564 Pinole94565 Pittsburg94569 Port Costa94572 Rodeo94575 Moraga94582 San Ramon94583 San Ramon94595 Walnut Creek94596 Walnut Creek94597 Walnut Creek94598 Walnut Creek94708 Berkeley94801 Richmond94803 El Sobrante94804 Richmond94805 Richmond94806 San Pablo
Population: U.S. Census Bureau, ACS 5-year estimates, 2024.