Contra Costa County, California Population 2020

Contra Costa County, California's estimated population is 1,144,863 with a growth rate of 0.67% in the past year according to the most recent United States census data. Contra Costa County, California is the 9th largest county in California.

Year Population Growth Growth Rate
20181,150,2155,3520.47%
20171,144,8637,6690.67%
20161,137,19412,5881.12%
20151,124,60615,2481.37%
20141,109,35815,6001.43%
20131,093,75816,0271.49%
20121,077,73112,2791.15%
20111,065,45212,8931.22%
20101,052,559248,82730.96%
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%

How Many People Live in Contra Costa County, California?

1,144,863

Population by Race

Race Population Percentage
White648,32557.21%
Asian185,06516.33%
Some Other Race112,9769.97%
Black or African American97,3338.59%
Two or More Races78,4346.92%
Native Hawaiian and Other Pacific Islander5,5850.49%
American Indian and Alaska Native5,5290.49%

Contra Costa County, California Population Pyramid 2020

Contra Costa County, California Median Age

39.4


Total

38.1


Male

40.7


Female

Contra Costa County, California Adults

There are 871,947 adults, (169,782 of whom are seniors) in Contra Costa County, California.

Contra Costa County, California Age Dependency

61.4

Age Dependency Ratio

24.2

Old Age Dependency Ratio

37.2

Child Dependency Ratio

Contra Costa County, California Sex Ratio

Female

579,546

51.14%

Male

553,701

48.86%

Contra Costa County, California Households and Families

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

Contra Costa County, California Household Types

Type Owner Renter
Married77.2%22.8%
All65.6%34.4%
Non Family53.8%46.2%
Male51.2%48.8%
Female47%53%

65.6%

Rate of Home Ownership

Type Count Average Size Owned
All392,2772.8665.6
Married215,0253.4477.2
Non Family110,1921.3353.8
Female47,8963.5147
Male19,1643.5651.2

3.35

Average Family Size

2.86

Average Household Size

5.5%

Unmarried (Opposite Sex)

0.4%

Unmarried (Same Sex)

Contra Costa County, California Education

Education Attained Count Percentage
Less Than 9th Grade44,7595.76%
9th to 12th Grade37,8154.86%
High School Graduate136,61017.57%
Some College169,70521.83%
Associates Degree64,2938.27%
Bachelors Degree203,10126.12%
Graduate Degree121,23615.59%

Contra Costa County, California Educational Attainment by Race

Name Total High School Bachelors
White383,538370,418193,429
Hispanic164,713115,51927,896
Asian134,527122,18875,257
Other Race66,04543,1527,621
Black65,44359,65317,252
Multiple Races34,24031,35012,093
Native American3,8643,084633
Islander3,4972,871558

The highest rate of high school graduation is among white people with a rate of 96.58%.

The highest rate of bachelors degrees is among asian people with a rate of 55.94%.

Name Average Male Female
Overall$52,838$62,562$43,785
Less Than High School$25,948$30,694$18,957
High School Grad$35,165$40,367$29,184
Some College$45,837$54,159$38,219
Bachelors Degree$72,778$90,405$59,161
Graduate Degree$95,927$125,270$76,728

$52,838

Average Earnings

$62,562

Average Male

$43,785

Average Female

Contra Costa County, California Language

Contra Costa County, California Language by Age

Contra Costa County, California Language

64.88% of Contra Costa County, California residents speak only English, while 35.12% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 18.01% of the population.

Contra Costa County, California Poverty

Contra Costa County, California Poverty by Race

Name Total In Poverty Poverty Rate
Hispanic285,50039,08513.69%
White499,06127,7755.57%
Other111,76718,52616.58%
Black95,80616,11116.82%
Asian184,23012,0746.55%
Multiple77,7329,67112.44%
Islander5,4185359.87%
Native5,4904528.23%

9.12%

Overall Poverty Rate

8.39%

Male Poverty Rate

9.83%

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 16.82% below the poverty level.

The race least likely to be in poverty in Contra Costa County, California is White, with 5.57% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 1.55%. Among those working part-time, it was 10.85%, and for those that did not work, the poverty rate was 15.37%.

Name Poverty
Less Than High School19.02%
High School11.73%
Some College7.33%
Bachelors or Greater3.42%

Contra Costa County, California Income

Contra Costa County, California Income by Household Type

Name Median Mean
Households$93,712$128,079
Families$107,907$144,933
Married Families$127,156$165,747
Non Families$55,976$77,826

Contra Costa County, California Marital Status

Contra Costa County, California Marital Status

Marriage Rates

51.7%

Overall Marriage Rate

54.0%

Male Marriage Rate

49.5%

Female Marriage Rate

Contra Costa County, California Married by Age and Sex

Contra Costa County, California Marriage

The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 35-44.

Contra Costa County, California Marital Status by Race

Contra Costa County, California Veterans

48,245

Number of Veterans

44,685

Male Veterans

3,560

Female Veterans

War Veterans
Vietnam17,800
First Gulf War7,340
Second Gulf War5,367
Korea5,342
World War II3,153

Contra Costa County, California Veterans by Race

Name Veterans % of Total
White35,3576.84%
Black5,6107.48%
Hispanic4,7312.41%
Asian3,6672.48%
2 or More1,8884.28%
Other1,2691.60%
Hawaiian2305.71%
Indian2245.11%

Contra Costa County, California Veterans by Education

4.42%

Veteran Poverty Rate

29.52%

Veteran Disability Rate

Contra Costa County, California Employment Status

64.7%

Labor Force Participation

60.7%

Employment Rate

6.1%

Unemployment Rate

Contra Costa County, California Place of Birth

Origin of Non Citizens

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

Origin of Naturalized Citizens

55.63%

Born in California

75.01%

Native Born

24.99%

Foreign Born

11.49%

Non Citizen

Place of Birth

75.01% of Contra Costa County, California residents were born in the United States, with 55.63% having been born in California. 11.49% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Population of Cities in Contra Costa County, California

City 2010 Census 2016 Estimated Growth Growth Rate
Concord12215412872665725.38%
Antioch10274511089881537.94%
Richmond10364510981361685.95%
San Ramon714547563941855.86%
Pittsburg6325970679742011.73%
Walnut Creek641656912249577.73%
Brentwood5162460532890817.26%
Danville418494463127826.65%
Oakley3543240622519014.65%
Martinez360363825922236.17%
Pleasant Hill331143485317395.25%
San Pablo291343053614024.81%
Lafayette237942610323099.70%
El Cerrito235862540018147.69%
Hercules240702536012905.36%
Orinda177511947017199.68%
Pinole18330192939635.25%
Moraga160061741614108.81%
Clayton109181199210749.84%
  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