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County ProfileCA

Contra Costa County

Population: 1,165,927 · 52 ZIP codes

Demographics

Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.

People
Total population
1,165,927
People
Median age
40.5
Housing
Total households
414,417
Income
Median household income
$127,229
Housing
Total housing units
429,260
Employment
Employment rate
60.4%
Education
Bachelor’s degree or higher
45.2%
Healthcare
Insured population
95.4%
County details
Local time 22:53:49(PT)
NameContra Costa
Total ZIP codes52total
ZIP codes (by type)
38 Standard13 PO Box1 Unique
Area code341, 510, 650, 805, 820, 925
TimezonePacific Time (PT)
Coordinates37.919479, -121.9515431
Land area716.9 sq miles(1,856.8 km²)

Map of Contra Costa county, California with ZIP codes

Map of Contra Costa County, California and ZIP codes

Cities and Communities in Contra Costa County

Compare the largest cities in Contra Costa County by population, median income, and growth. Use the table below to analyze key demographic shifts across the region.

CityPopulation
Median incomeHousehold
ZIP codes
Concord125,410$108,7098ZIPs
Richmond116,448$95,3917ZIPs
Antioch115,291$97,4652ZIPs
San Ramon84,605$196,1612ZIPs
Pittsburg76,416$99,8611ZIPs
Walnut Creek70,127$130,4324ZIPs
Brentwood64,292$142,4941ZIPs
Danville43,582$232,2162ZIPs
Oakley43,357$137,6771ZIPs
Martinez37,287$127,3551ZIPs
Pleasant Hill34,613$145,0291ZIPs
San Pablo32,127$79,4781ZIPs
Hercules26,016$129,3971ZIPs
El Cerrito25,962$127,8761ZIPs
Lafayette25,391$228,2501ZIPs
Orinda19,514$250,0011ZIPs
Pinole19,022$127,7171ZIPs
Moraga16,870$216,1933ZIPs
El Sobrante15,524$114,8532ZIPs
Discovery Bay15,358$147,1171ZIPs
Alamo15,314$250,0011ZIPs
Clayton11,070$175,7071ZIPs
Rodeo9,653$91,4841ZIPs
Crockett3,242$110,8991ZIPs
Bethel Island2,131$74,9721ZIPs
Knightsen1,596$177,2321ZIPs
Diablo1,255$248,1501ZIPs
Byron1,140$76,4241ZIPs
Canyon212—1ZIPs
Port Costa190$38,9291ZIPs

— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.

ZIP Codes in Contra Costa County

Review the most populated postal areas across Contra Costa County. Use the ranking below to compare resident density and demographic scales between the county's major zones.

ZIPCity
Median incomeHousehold
Population (ZIP)
94565Pittsburg$95,556100,341
94509Antioch$86,19669,931
94513Brentwood$142,22367,394
94806San Pablo$86,03464,589
94553Martinez$124,13049,756
94582San Ramon$214,67749,311
94531Antioch$120,92745,342
94804Richmond$91,03745,108
94561Oakley$134,67844,545
94521Concord$125,89942,885
94583San Ramon$184,89838,444
94520Concord$82,47938,383
94523Pleasant Hill$142,58635,272
94801Richmond$81,72833,486
94526Danville$225,09733,064
94549Lafayette$234,51628,637
94518Concord$112,09427,209
94598Walnut Creek$186,22526,826
94803El Sobrante$118,44726,457
94530El Cerrito$128,52926,360

Data Sources & Citations

The geographic and demographic information presented on this site is compiled from publicly available, authoritative sources, including:

  • United States Census BureauDemographic, population, housing, and socioeconomic data sourced from Census Bureau datasets, including the Decennial Census and the American Community Survey (ACS).Census Data
  • United States Postal Service (USPS)ZIP code classifications, delivery types, and postal designations used for reference purposes. USPS ZIP codes are intended for mail delivery and may not always align exactly with Census geographic boundaries.USPS