Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

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zipcodes.pro — STATE/CA/COUNTY/CONTRA-COSTA

Contra Costa County, CA ZIP codes

There are 53 ZIP codes in Contra Costa County, CA, in 31 towns, from 94505 to 94850. The largest are 94565 (Pittsburg), 94513 (Brentwood) and 94509 (Antioch).

The county seat is Martinez.

ZIP codes
53
Towns
31
County seat
Martinez
County FIPS
06013
Population
1,165,012
Median household income
$127,229
Land area
717 sq mi
Area codes
341, 510, 925

Contra Costa County ZIP codes by town

Martinez (county seat)
94553

Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.

Map of Contra Costa County ZIP codes

9450594506945079450994511945139451494516945179451894519945209452194522945239452494525945269452794528945299453094531945479454894549945539455694561945639456494565945699457094572945759458294583945959459694597945989470894801948029480394804948059480694807948089482094850

The ZIP codes of Contra Costa County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Contra Costa County in numbers

About 1,165,012 people live in Contra Costa County, in 414,417 households, the 9th most populous of California's 58 counties. The median household income is $127,229 a year, 28% above the California median of $99,122 (US: $80,734). The median owner-occupied home is valued at $866,800 (18% above the California median), and median gross rent is $2,375 a month. The median age is 40.5; 45.2% of adults 25 and over hold a bachelor's degree or higher (37.1% across California); the average commute takes 35 minutes.

Population1,165,012Contra Costa1,165,012
Households414,417Contra Costa414,417
Median age40.5Contra Costa40.5California37.9US 38.9
Median household income$127,229Contra Costa$127,229California$99,122US $80,734
Median home value$866,800Contra Costa$866,800California$734,700US $332,700
Median gross rent$2,375Contra Costa$2,375California$2,036US $1,413
Bachelor's degree or higher45.2%Contra Costa45.2%California37.1%US 35.7%
Mean commute35.3 minContra Costa35.3 minCalifornia28.7 minUS 26.4 min
Population density1,625 / sq miContra Costa1,625 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.

Largest towns in Contra Costa County

Largest towns in Contra Costa County
TownZIP codesPopulation
Concord 8 124,035
Berkeley 1 120,257
Antioch 2 116,477
Richmond 7 115,505
San Ramon 2 85,993
Pittsburg 1 76,257
Walnut Creek 4 70,088
Brentwood 1 65,208
Oakley 1 45,183
Danville 2 43,401
Martinez 1 36,903
Pleasant Hill 1 34,235
San Pablo 1 31,720
Hercules 1 26,302
El Cerrito 1 25,994

Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.

Neighbouring counties

Counties that share a ZIP code with Contra Costa County.

Not sure you are in Contra Costa County? What county am I in? answers from your location, near a county line included.

Every ZIP code in Contra Costa County, with figures

ZIP codes in Contra Costa County
ZIP City Type Population Median income Median home
94505 Discovery Bay , CA Standard 14,970 $146,480 $830,500
94506 Danville , CA Standard 27,055 $250,000+ $1,956,800
94507 Alamo , CA Standard 14,586 $250,000+ $2,000,000+
94509 Antioch , CA Standard 70,090 $86,196 $584,100
94511 Bethel Island , CA Standard 1,864 $74,972 $682,700
94513 Brentwood , CA Standard 69,755 $142,223 $837,800
94514 Byron , CA Standard 1,953 $76,511 $735,600
94516 Canyon , CA Standard 214 $113,333 $784,700
94517 Clayton , CA Standard 12,316 $168,921 $1,032,100
94518 Concord , CA Standard 27,345 $112,094 $859,000
94519 Concord , CA Standard 19,058 $122,418 $783,700
94520 Concord , CA Standard 37,381 $82,479 $601,000
94521 Concord , CA Standard 41,909 $125,899 $853,200
94522 Concord , CA No street area — — —
94523 Pleasant Hill , CA Standard 34,592 $142,586 $1,076,600
94524 Concord , CA No street area — — —
94525 Crockett , CA Standard 3,372 $110,899 $776,100
94526 Danville , CA Standard 32,584 $225,097 $1,677,700
94527 Concord , CA No street area — — —
94528 Diablo , CA Standard 1,049 $207,500 $2,000,000+
94529 Concord , CA No street area — — —
94530 El Cerrito , CA Standard 26,401 $128,529 $1,114,100
94531 Antioch , CA Standard 46,387 $120,927 $701,600
94547 Hercules , CA Standard 26,302 $129,397 $769,400
94548 Knightsen , CA Standard 832 $189,653 $959,900
94549 Lafayette , CA Standard 28,420 $234,516 $2,000,000+
94553 Martinez , CA Standard 48,643 $124,130 $825,900
94556 Moraga , CA Standard 15,998 $215,720 $1,659,600
94561 Oakley , CA Standard 46,368 $134,678 $659,800
94563 Orinda , CA Standard 19,378 $250,000+ $1,866,500
94564 Pinole , CA Standard 18,761 $127,717 $718,600
94565 Pittsburg , CA Standard 100,488 $95,556 $583,800
94569 Port Costa , CA Standard 296 $38,929 $600,000
94570 Moraga , CA No street area — — —
94572 Rodeo , CA Standard 8,976 $91,484 $663,200
94575 Moraga , CA Standard 975 — —
94582 San Ramon , CA Standard 47,424 $214,677 $1,635,700
94583 San Ramon , CA Standard 39,583 $184,898 $1,383,600
94595 Walnut Creek , CA Standard 16,988 $100,552 $860,600
94596 Walnut Creek , CA Standard 23,417 $135,635 $1,277,800
94597 Walnut Creek , CA Standard 23,129 $132,063 $1,026,800
94598 Walnut Creek , CA Standard 27,206 $186,225 $1,339,900
94708 Berkeley , CA Standard 11,947 $234,923 $1,593,000
94801 Richmond , CA Standard 33,591 $81,728 $609,000
94802 Richmond , CA No street area — — —
94803 El Sobrante , CA Standard 27,659 $118,447 $783,900
94804 Richmond , CA Standard 44,891 $91,037 $631,900
94805 Richmond , CA Standard 14,670 $111,152 $791,900
94806 San Pablo , CA Standard 62,546 $86,034 $607,800
94807 Richmond , CA No street area — — —
94808 Richmond , CA No street area — — —
94820 El Sobrante , CA No street area — — —
94850 Richmond , CA No street area — — —

Cite this page

zipcodes.pro. “Contra Costa County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/ca/county/contra-costa

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