Data Last Updated: April 1, 2025

Contra Costa County, CA ZIP Codes

ZIP Codes: Shows how many general ZIP Codes, PO Boxes, Unique (Business), and Multi County ZIP Codes are associated with Contra Costa, CA.	56 ZIP Codes (38 General, 13 PO Box, 1 Unique, & 4 Multi County) [More Details]
Area Codes: The Telephone Area Codes that are associated with Contra Costa, CA. Area Codes are used in the North American Numbering Plan (NANP) to facilitate phone routing. There are approximately 350 area codes in use in the United States.	341, 369, 510, 707, 925
Timezone: Time zone designation within the U.S. Please note that not all areas in the U.S. observe daylight saving time which can affect actual local time for this city. There are 7 standard time zones which are, from west to east: Hawaii-Aleutian, Alaska, Pacific, Mountain, Central, Eastern, Atlantic. Also included in U.S. Territories are Samoa, Guam and Palau.	Pacific
Local Time: The current local time for each timezone. If more than 1 time zone for this area, all local times will be shown. Counties can cross timezones, so more than 1 may be shown.	12:00:00 AM
Population: The population of Contra Costa, CA from the U.S. Census 2020. Included are U.S. Citizens, permanent residents, temporary migrants, and undocumented individuals. The total population represents people who live in the city, not just those present while the Census was being completed.	1,165,927 [More Details]
FIPS: FIPS stands for Federal Information Processing Standards, which are a set of publicly announced standards for computer systems. A county FIPS code is a unique numeric identifier for a county in the United States, assigned by the National Institute of Standards and Technology (NIST). County FIPS codes have five digits, with the first two digits identifying the state and the last 3 indicating the county.	06013
CBSA: A Core Based Statistical Area (CBSA) is the recognized term for a region that functions around an urban core with a population of at least 10,000 people, according to the standards set by the Office of Management and Budget (OMB) in 2000. A CBSA is divided into two subsets: Metro and Micro, and these classifications are determined by population density. A Micro area is identified by a population ranging between 10,000 to 50,000, while a Metro area is defined as having a population that exceeds 50,000.	San Francisco-Oakland-Fremont, CA
Land Area: The approximate amount of land area covered by Contra Costa, CA in square miles. The Land Area provided by the Census Bureau is based on geographic boundaries that include the mainland, islands, inland, coastal, Great Lakes, and territorial waters associated with each city.	717 square miles
Water Area: The approximate amount of water area covered by Contra Costa, CA in square miles. Calculations by the Census Bureau for Water Area take into account inland bodies of water, coastal regions, Great Lakes, and territorial sea waters. This encompasses features such as lakes, reservoirs, rivers, and coastal water bodies.	87 square miles
Coordinates: The latitude/longitude centroid coordinates for Contra Costa County, CA.	-121.927527, 37.919157
Quick Link: Copy the direct link to the Contra Costa, CACounty page and use anywhere you like!	https://www.zip-codes.com/county/ca-contra-costa.asp

Contra Costa, CA ZIP Code Boundaries

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Contra Costa County, CA Covers 56 ZIP Codes

ZIP Code	Classification	City	Population	% of Population
ZIP Code 94505	General	Discovery Bay	15,445	1.32%
ZIP Code 94506	General	Danville	25,361	2.18%
ZIP Code 94507	General	Alamo	15,495	1.33%
ZIP Code 94509	General	Antioch	69,931	6.00%
ZIP Code 94511	P.O. Box	Bethel Island	2,131	0.18%
ZIP Code 94513	General	Brentwood	67,394	5.78%
ZIP Code 94514	General	Byron	1,248	0.11%
ZIP Code 94516	P.O. Box	Canyon	212	0.02%
ZIP Code 94517	General	Clayton	12,525	1.07%
ZIP Code 94518	General	Concord	27,209	2.33%
ZIP Code 94519	General	Concord	18,677	1.60%
ZIP Code 94520	General	Concord	38,383	3.29%
ZIP Code 94521	General	Concord	42,885	3.68%
ZIP Code 94522	P.O. Box	Concord	0	0.00%
ZIP Code 94523	General	Pleasant Hill	35,272	3.03%
ZIP Code 94524	P.O. Box	Concord	0	0.00%
ZIP Code 94525	General	Crockett	3,288	0.28%
ZIP Code 94526	General	Danville	33,064	2.84%
ZIP Code 94527	P.O. Box	Concord	0	0.00%
ZIP Code 94528	P.O. Box	Diablo	1,054	0.09%
ZIP Code 94529	Unique	Concord	0	0.00%
ZIP Code 94530	General	El Cerrito	26,360	2.26%
ZIP Code 94531	General	Antioch	45,342	3.89%
ZIP Code 94547	General	Hercules	26,016	2.23%
ZIP Code 94548	P.O. Box	Knightsen	420	0.04%
ZIP Code 94549	General	Lafayette	28,637	2.46%
ZIP Code 94551 *	General	Livermore	40,358	--
ZIP Code 94553	General	Martinez	49,756	4.27%
ZIP Code 94556	General	Moraga	16,134	1.38%
ZIP Code 94561	General	Oakley	44,545	3.82%
ZIP Code 94563	General	Orinda	19,496	1.67%
ZIP Code 94564	General	Pinole	19,024	1.63%
ZIP Code 94565	General	Pittsburg	100,341	8.61%
ZIP Code 94569	P.O. Box	Port Costa	210	0.02%
ZIP Code 94570	P.O. Box	Moraga	0	0.00%
ZIP Code 94572	General	Rodeo	9,622	0.83%
ZIP Code 94575	General	Moraga	933	0.08%
ZIP Code 94582	General	San Ramon	49,311	4.23%
ZIP Code 94583	General	San Ramon	38,444	3.30%
ZIP Code 94595	General	Walnut Creek	17,716	1.52%
ZIP Code 94596	General	Walnut Creek	22,861	1.96%
ZIP Code 94597	General	Walnut Creek	23,661	2.03%
ZIP Code 94598	General	Walnut Creek	26,826	2.30%
ZIP Code 94706 *	General	Albany	21,134	--
ZIP Code 94707 *	General	Berkeley	12,781	--
ZIP Code 94708 *	General	Berkeley	11,553	--
ZIP Code 94801	General	Richmond	33,486	2.87%
ZIP Code 94802	P.O. Box	Richmond	0	0.00%
ZIP Code 94803	General	El Sobrante	26,457	2.27%
ZIP Code 94804	General	Richmond	45,108	3.87%
ZIP Code 94805	General	Richmond	14,958	1.28%
ZIP Code 94806	General	San Pablo	64,589	5.54%
ZIP Code 94807	P.O. Box	Richmond	0	0.00%
ZIP Code 94808	P.O. Box	Richmond	0	0.00%
ZIP Code 94820	P.O. Box	El Sobrante	0	0.00%
ZIP Code 94850	General	Richmond	0	0.00%

* Indicates a Multi County ZIP Code. These ZIP Codes partially cross over into Contra Costa, CA, but will mostly cover area in a different County. Not included in % of Population calculations.

Important Contra Costa, CA Information

Contra Costa County, CA Covers 56 ZIP Codes. This includes 38 General ZIP Codes, 13 PO Box ZIP Codes, and 1 Unique (reserved for Business and Volume Mail Receivers). There are also 4 Multi County ZIP Codes. These records are assigned a different primary county, but they partially cover area in Contra Costa County.

The population for Contra Costa County is 1,165,927, according to the U.S. Census. Population Density is 1,626.12 persons per square mile. With 423,342 Housing Units, the Average Household Size is 2.84 persons. There are 407,029 Family Households with an Average Family Size of 3.00 persons. 4.27% of the population is without Health Insurance. The 61.19% Employment Rate is 1.39% above the national average of 59.8%.810,988 people aged 25+ have some educational achievement, with 44.91% (or 364,216 people) having attained a Bachelor's Degree or higher.More Demographics are available below.

There are 5 area codes serving this area including341, 369, 510, 707 and 925. Contra Costa is also located in the Pacific timezone and the current local time is shown above.

Contra Costa is part of the San Francisco-Oakland-Fremont, CA Core Based Statistical Area (CBSA). Its CBSA Code is 41860.It is classified as a metro area, which means the combined population is 50,000 or more (at its core).

CBSAs are defined by the OMB as geographic areas that have at least one core with a population of 10,000 or more (for a micro area) and adjacent territory with a high degree of social and economic integration. CBSA codes are commonly used to accurately file Medicare claims and to verify applicable incentives using a patient's ZIP Code.

ZIP Codes in Contra Costa, CA have 420,538 Residential mailboxes and 25,851 Business mailboxes.There are 25,513 businesses with a total of 339,204 employees. That is an average of 13.3 employees per business. Annual payroll for these businesses is $26,920,954,000. Other Demographics

Contra Costa County Demographic Profile

Population & People

Total Population

1,165,927

Income

Median Household Income

$125,727

Housing

Total Housing Units

423,342

Health

Without Healthcare Coverage

4.27%

Business & Economy

Total Businesses

25,513

Families

Total Households

407,029

Employment

Employment Rate

61.19%

Education

Bachelor's Degree or Higher

44.91%

Total Population: Total number of people from the 2020 U.S. Census for Contra Costa, CA. This reflects the exact count of this area at that point in time, not future estimates, regardless of citizenship or immigration status. It is intended to count all persons living within the geographic area, not just those present on the day of the census.	1,165,927
Current Population Estimate: This field gives the estimated household population for All ZIP Codes in Contra Costa, CA. This is derived from known delivery information, household occupancy rates, household size, and more to come up with an accurate estimation for the current population. IMPORTANT: This does not include population totals for persons in nursing homes, correctional facilities, or other institutions. This is an estimation of the household population based on US Postal Service delivery information.	1,195,251
Total Households: Total number of Households from the 2020 U.S. Census for Contra Costa, CA. A Household includes everyone living in a residential housing unit. This includes families, roommates in a single residence, or a person living alone.	407,029
Total Housing Units: The total number of Housing Units is the number of occupied units + the number of vacant units. Ownership is defined by whether the unit is occupied by an owner or by a tenant. Owner occupancy means that the owner lives in the unit. This value comes from the 2020 U.S. Census and is not a projection or estimate.	423,342
Average Household Size: The Average Household Size, is obtained by dividing the number of people in Households (excluding those in group quarters, nursing home, prisons, and dorm rooms) by the number of Households. A Household includes everyone living in a residential unit. Those who do not live in a household are classified as living in group accommodation. This value is an estimate from the U.S. Census ACS (American Community Survey) and is updated yearly.	2.84
Average Family Size: Average Family Size is calculated by dividing the number of people in a Family Household by the number of Family Households. The U.S. Census Bureau defines family households as households consisting of two or more individuals who are related by birth, marriage, or adoption. They also may include other unrelated people. Non-family households consist of people who live alone or who share their residence with unrelated individuals. The Average Family Size only looks at the households classified as Family Households. This value is an estimate from the U.S. Census ACS (American Community Survey) and is updated yearly.	3.00

Other Contra Costa Demographics

# Residential Mailboxes: The number of active residential delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	420,538
# Business Mailboxes: The number of active business delivery mailboxes and centralized units. This excludes PO Boxes and all other contract box types.	25,851
Total Delivery Receptacles: The total number of delivery receptacles. This includes curb side mailboxes, centralized units, PO Boxes, NDCBU, and contract boxes. This count is for Residential and Business combined.	520,994
Single Family Delivery Units: Total count of single family mail delivery receptacles; generally analogous to homes.	283,624
Multi Family Delivery Units: Total count of multifamily mail delivery receptacles; generally analogous to apartments.	76,560

# of Businesses: The total number of Business Establishments. Data taken from Business Census 2023.	25,513
1st Quarter Payroll: The total payroll for the first quarter. Data taken from Business Census 2023.	$6,901,905,000
Annual Payroll: The total annual payroll . Data taken from Business Census 2023.	$26,920,954,000
# of Employees: The total number of employees for all ZIP Codes in this City. Data taken from Business Census 2023.	339,204

Sum of all ZIP Codes assigned Contra Costa, CA as their primary County.

References

U.S. Postal Service [Last Updated: 4/1/2025], https://www.usps.com
ZIP-Codes.com Internal Data Creation [Last Updated: 4/1/2025], https://www.zip-codes.com
U.S. Geological Survey [Updated as needed], https://www.usgs.gov
U.S. Census [Updated Yearly], https://www.census.gov
U.S. Census 2020 [Decennial] [Last Updated: 5/25/2023], https://www.census.gov