• county
  • FIPS 06013
  • Largest town: Concord

Contra Costa County, California

Contra Costa County had 1,172,607 residents in the Census Vintage 2024 estimate, on 716.9 square miles of land. It ranks 9th of 58 in California by population and 51st by land area.

Population
1,172,607
#9 of 58 in California · #41 in US
Area
716.9 sq mi
#51 of 58 in California · #1,261 in US
Density
1,636 / sq mi
#7 of 58 in California · #97 in US
Median household income
$122,000
#5 of 58 in California · #32 in US

Census Vintage 2024 estimates · SAIPE 2023 income · 2024 Gazetteer land area

Contra Costa County within California. Pin: Sacramento.

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Tools and pages that start from Contra Costa County

Contra Costa County population, land area and income

Contra Costa County had 1,172,607 residents in the Census Vintage 2024 estimate, on 716.9 square miles of land. It ranks 9th of 58 in California by population and 51st by land area. That works out to 1,635.7 people per square mile, 17.0 times the US average of 96.3, and in the top tenth nationally.

The median county-equivalent in California has 187,274 residents, so Contra Costa County is 6.3 times that size.

Its SAIPE 2023 median household income of $122,000 is in the top tenth among 3,143 counties with an estimate.

National rank among 3,144

Population

1,172,607

3144th1st

41st of 3,144 (US)

Land area

717 sq mi

3144th1st

1261st of 3,144 (US)

Density

1,635.7 / sq mi

3144th1st

97th of 3,144 (US)

Median household income

$122,000

3143rd1st

32nd of 3,143 (US)

Rank within California (58)

Population

1,172,607

58th1st

9th of 58 (CA)

Land area

717 sq mi

58th1st

51st of 58 (CA)

Density

1,635.7 / sq mi

58th1st

7th of 58 (CA)

Median household income

$122,000

58th1st

5th of 58 (CA)

How Contra Costa County's population changed since 2020

Contra Costa County gained 6,442 residents between the July 2020 and July 2024 estimates, a rise of 0.6%. That ranks 21st of 58 in California for growth. The median California county changed by -0.6%, and the state as a whole by -0.2%.

Since the April 2020 estimates base, Contra Costa County recorded 48,971 births and 37,681 deaths, a natural change of +11,290. Net international migration added +32,081 and net domestic migration, people moving to or from other US counties, came to -37,989. The largest single component was domestic migration, which removed 37,989 people.

1.17M20201.16M20211.16M20221.16M20231.17M2024
Census Vintage 2024 county estimates for July 1 of each year. The axis starts above zero so year-to-year changes are visible.

Components of change, April 2020 to July 2024

Births
48,971
Deaths
37,681
Net international migration
+32,081
Net domestic migration
-37,989
Change, July 2023 to July 2024
+10,428

Where Contra Costa County is

The Census internal point of Contra Costa County is at 37.919500, -121.951500. It sits in UTM zone 10N. The map shades California's 58 county-equivalents by population change from 2020 to 2024, darker for faster growth, with Contra Costa County outlined. Dots are towns of 1,000+ people with residents in it.

Los Angeles County: -2.4%Kings County: +1.4%Sierra County: -3.6%Riverside County: +4.3%Santa Barbara County: -0.8%San Bernardino County: +1.4%Nevada County: -0.1%Santa Clara County: +0.1%Yuba County: +6.7%Fresno County: +1.4%Plumas County: -4.7%Monterey County: -1.0%Amador County: +3.6%Alameda County: -1.9%Tulare County: +2.0%San Joaquin County: +4.5%Alpine County: -6.8%Siskiyou County: -3.4%Butte County: -0.9%Kern County: +1.8%San Diego County: -0.1%Sacramento County: +1.5%Ventura County: -1.0%Yolo County: +3.4%Lake County: -0.6%Napa County: -3.4%Tehama County: -1.9%San Francisco County: -5.4%El Dorado County: +0.8%Calaveras County: +2.5%Inyo County: -2.7%Shasta County: -0.6%Lassen County: -12.3%San Luis Obispo County: -0.0%Mariposa County: -0.5%Trinity County: -2.8%Contra Costa County: +0.6%Mendocino County: -2.4%Imperial County: +1.1%Santa Cruz County: -3.4%Placer County: +6.9%Orange County: -0.5%San Benito County: +7.2%Marin County: -1.9%San Mateo County: -2.6%Colusa County: +0.9%Del Norte County: -2.2%Solano County: +0.5%Glenn County: -2.0%Tuolumne County: -2.7%Sonoma County: -0.6%Humboldt County: -2.9%Mono County: -1.8%Stanislaus County: +0.6%Merced County: +4.9%Sutter County: -0.9%Madera County: +5.8%Modoc County: -2.1%
Change 2020 to 2024
  1. < -2.7%
  2. < -1.0%
  3. < -0.0%
  4. < +1.5%
  5. ≥ +1.5%
no data

Orange pin: Contra Costa County internal point. Dark pin: Sacramento.

Internal point

Decimal
37.919500, -121.951500
DMS
37°55'10.20"N 121°57'5.40"W
UTM
10N 592157.3E 4197401.7N
Geohash
9q9r8zj9h
Plus code
849WW29X+R9

Towns in Contra Costa County

19 incorporated places of 1,000+ people have residents in Contra Costa County, 995,431 people together, or 85% of the county. Each figure counts only the part of the town inside Contra Costa County; towns marked "part" extend into another county. The largest is Concord with 124,016.

  1. 01Concord124,016
  2. 02Antioch118,453
  3. 03Richmond115,353
  4. 04San Ramon85,924
  5. 05Pittsburg77,131
  6. 06Walnut Creek70,817
  7. 07Brentwood66,286
  8. 08Oakley47,158
  9. 09Danville43,410
  10. 10Martinez37,006
  11. 11Pleasant Hill34,169
  12. 12San Pablo31,562
  13. 13Hercules26,499
  14. 14El Cerrito26,409
  15. 15Lafayette25,371
Census Vintage 2024 subcounty estimates, county parts of incorporated places (SUMLEV 157).

Counties bordering Contra Costa County

The Census 2024 county adjacency file lists 7 neighbors for Contra Costa County. The most populous is Alameda County, CA, with 1,649,060 residents. Distances run between Census internal points in a straight line.

Distance to Sacramento and the nearest big city

Sacramento is 51.8 miles NNE of Contra Costa County's internal point in a straight line. The nearest place of 100,000 or more is Concord, CA (population 124,016), 4.5 miles away. The nearest place of 10,000 or more is Clayton, CA (population 10,933), 1.9 miles away.

Contra Costa County FIPS code

The FIPS code of Contra Costa County is 06013: state code 06 for California plus county code 013. Use it as text, with the leading zero, when joining Census, BLS, or CDC county tables. SAIPE lists its 2023 median household income as $122,000.

Questions people ask

What is the population of Contra Costa County, California?

The Census Vintage 2024 estimate for July 1, 2024 is 1,172,607. That is up 6,442 people (0.6%) from the July 2020 estimate of 1,166,165.

What is the FIPS code of Contra Costa County?

06013. The first two digits (06) are California; the last three (013) identify the county.

What is the largest town in Contra Costa County?

Concord, with 124,016 residents inside Contra Costa County in 2024.

Which counties border Contra Costa County?

7 county-equivalents border it in the Census 2024 adjacency file: Alameda County, CA; Sacramento County, CA; San Francisco County, CA; San Joaquin County, CA; Sonoma County, CA; Solano County, CA; Marin County, CA.

Sources and data as of

Data as of: Census Vintage 2024 population estimates, 2024 Gazetteer land area and internal points, SAIPE 2023 median household income.

  1. 01Census Vintage 2024 county population estimates
  2. 02Census 2024 Gazetteer, counties
  3. 03Census SAIPE 2023 state and county estimates
  4. 04Census Vintage 2024 subcounty population estimates
  5. 05Census 2024 county adjacency file
  6. 06Census 2024 cartographic boundary file, counties (1:5,000,000)

How every number is computed: methodology. Spotted a wrong figure? Report an error.