Contra Costa County, California Population 2021

Contra Costa County, California's estimated population is 1,159,540 with a growth rate of 0.26% in the past year according to the most recent United States census data. Contra Costa County, California is the 10th largest county in California. The 2010 Population was 1,052,540 and has seen a growth of 10.17% since this time.

Note: 2020 and 2021 data is projected
Year Population Growth Growth Rate
20211,159,5403,0100.26%
20201,156,5303,0000.26%
20191,153,5303,0100.26%
20181,150,5204,9800.43%
20171,145,5408,2700.73%
20161,137,27012,8701.14%
20151,124,40015,5201.40%
20141,108,88015,4801.42%
20131,093,40015,8501.47%
20121,077,55012,1101.14%
20111,065,44012,9001.23%
20101,052,540248,80830.96%
1990803,732147,35222.45%
1980656,38097,99117.55%
1970558,389149,35936.52%
1960409,030110,04636.81%
1950298,984198,534197.64%
1940100,45021,84227.79%
193078,60824,71945.87%
192053,88922,21570.14%
191031,67413,62875.52%
190018,0464,53133.53%
189013,5159907.90%
188012,5254,06448.03%
18708,4613,13358.80%
18605,3280.00%
2021 Growth Rate
0.26%
County Website
County Seat
2010 Population
1,052,540
Growth Since 2010
10.17%
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Contra Costa County, California Population Growth

Population by Race

Race Population Percentage
White637,90455.85%
Asian190,98316.72%
Some Other Race124,62910.91%
Black or African American99,6428.72%
Two or More Races77,9566.82%
Native Hawaiian and Other Pacific Islander5,6310.49%
American Indian and Alaska Native5,5060.48%
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Contra Costa County, California Population by Race

Contra Costa County, California Population Pyramid $2021

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Contra Costa County, California Median Age

39.7


Total

38.3


Male

40.9


Female

Contra Costa County, California Adults

There are 881,048 adults, (175,882 of whom are seniors) in Contra Costa County, California.

Contra Costa County, California Age Dependency

62

Age Dependency Ratio

24.9

Old Age Dependency Ratio

37

Child Dependency Ratio

Contra Costa County, California Sex Ratio

Female

583,749

51.11%

Male

558,502

48.89%

Contra Costa County, California Population by Age

Contra Costa County, California Renter vs Owner Occupied by Household Type

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Contra Costa County, California Household Types

Type Owner Renter
Married77.1%22.9%
All65.9%34.1%
Non Family54.4%45.6%
Male52%48%
Female47.5%52.5%

65.9%

Rate of Home Ownership

Contra Costa County, California Households and Families

Type Count Average Size Owned
All394,7692.8765.9
Married217,3703.4577.1
Non Family109,9631.3254.4
Female48,2563.5247.5
Male19,1803.5552

3.35

Average Family Size

2.87

Average Household Size

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Contra Costa County, California Households by Type

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Education Attained Count Percentage
Less Than 9th Grade44,3935.64%
9th to 12th Grade38,5284.89%
High School Graduate135,82517.25%
Some College168,81121.45%
Associates Degree66,2238.41%
Bachelors Degree206,62226.25%
Graduate Degree126,77616.11%
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Contra Costa County, California Educational Attainment by Sex (over 25)

Contra Costa County, California Educational Attainment by Race

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Race Total High School Bachelors
White382,807370,462195,792
Hispanic168,367118,02628,817
Asian139,449126,85379,328
Other Race72,54146,5978,219
Black67,30861,88318,236
2+ Races34,80531,68012,638
Native American3,8673,065684
Islander3,6653,012660

The highest rate of high school graduation is among white people with a rate of 96.78%.

The highest rate of bachelors degrees is among asian people with a rate of 56.89%.

Contra Costa County, California Educational Attainment by Race

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Name Average Male Female
Overall$54,396$64,594$45,951
Less Than 9th Grade$26,866$31,981$20,411
High School Graduate$37,701$43,737$30,408
Some College$47,298$55,061$39,391
Bachelors Degree$76,048$95,403$61,426
Graduate Degree$100,426$129,308$81,131

$54,396

Average Earnings

$64,594

Average Male

$45,951

Average Female

Contra Costa County, California Earnings by Educational Attainment

Contra Costa County, California Language by Age

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Contra Costa County, California Language

64.24% of Contra Costa County, California residents speak only English, while 35.76% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 18.32% of the population.

Contra Costa County, California Language

Contra Costa County, California Poverty by Race

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Name Total In Poverty Poverty Rate
Hispanic289,64337,52412.96%
White497,06226,5605.34%
Other123,35720,17716.36%
Black98,07716,06516.38%
Asian190,04511,7446.18%
Multiple77,1478,71311.29%
Native5,4154378.07%
Islander5,5572815.06%

8.70%

Overall Poverty Rate

7.92%

Male Poverty Rate

9.46%

Female Poverty Rate

Poverty in Contra Costa County, California

The race most likely to be in poverty in Contra Costa County, California is Black, with 16.38% below the poverty level.

The race least likely to be in poverty in Contra Costa County, California is Islander, with 5.06% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.57%. Among those working part-time, it was 10.22%, and for those that did not work, the poverty rate was 15.04%.

Contra Costa County, California Poverty

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Name Poverty
Less Than 9th Grade17.94%
High School11.22%
Some College7.00%
Bachelors or Greater3.38%

Contra Costa County, California Poverty Rate by Education

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Rate Poverty
Female Unemployed24.48%
Male Unemployed20.97%
Female Employed4.56%
Male Employed3.81%

Contra Costa County, California Poverty Rate by Employment Status and Sex

Contra Costa County, California Income by Household Type

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Name Median Mean
Households$99,716$135,742
Families$114,535$152,942
Married Families$135,343$175,223
Non Families$59,777$83,125
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Income by Household Type

Contra Costa County, California Marital Status

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Marriage Rates

51.8%

Overall Marriage Rate

54.2%

Male Marriage Rate

49.6%

Female Marriage Rate

Contra Costa County, California Married by Age and Sex

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Contra Costa County, California Marriage

The age group where males are most likely to be married is 45-54, while the female age group most likely to be married is 35-44.

Contra Costa County, California Marital Status by Race

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Contra Costa County, California Marital Status

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46,968

Number of Veterans

43,398

Male Veterans

3,570

Female Veterans

War Veterans
Vietnam17,286
First Gulf War7,520
Second Gulf War5,718
Korea4,713
World War II2,744

Contra Costa County, California Veterans by War

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Age Group Veterans
75+14,299
65 to 7412,810
35 to 549,903
55 to 647,715
18 to 342,241

Contra Costa County, California Veterans by Age

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Name Veterans % of Total
White34,3286.72%
Black5,7827.50%
Hispanic4,7532.37%
Asian3,3792.21%
2+ Races1,9434.43%
Other Race1,1031.26%
Native American2245.12%
Islander2094.87%

Contra Costa County, California Veterans by Race

Contra Costa County, California Veterans by Education

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4.34%

Veteran Poverty Rate

30.01%

Veteran Disability Rate

Contra Costa County, California Veterans by Education

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64.8%

Labor Force Participation

61.3%

Employment Rate

5.3%

Unemployment Rate

Contra Costa County, California Employment by Age

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Contra Costa County, California Employment by Race

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Contra Costa County, California Employment by Education

Origin of Non-Citizens

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Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

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55.33%

Born in Contra Costa County, California

74.60%

Native Born

25.40%

Foreign Born

11.52%

Non Citizen

13.89%

Naturalized

Place of Birth

74.60% of Contra Costa County, California residents were born in the United States, with 55.33% having been born in California. 11.52% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Contra Costa County, California Place of Birth

  1. US Census City/Town Population estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. Population of States and Counties of the United States: 1790 - 1990

Sources