topographic

Unincorporated Contra Costa County

178,527
Total Population in 2020
In 2020, Unincorporated Contra Costa County was home to 178,527 people. Residents were a majority working age. The population was diverse, with no racial group in the majority, and there were more men than women.

Most Populous Demographics

CategoryDemographicTotalPercentage
Age18-64108,18261%
SexFemale90,66251%
Race and Hispanic or LatinoWhite (Not Hispanic or Latino)80,12645%

Age

In 2020, Unincorporated Contra Costa County's population was majority working-age adults, while those under age 18 were a moderately larger share than those 65 and older. Looking at 10-year age ranges, 50-59 was the largest group.

Population by Age Range

07k14k21k28k0-910-1920-2930-3940-4950-5960-6970-7980+11%13%11%13%13%15%13%8%4%
07k14k21k28k11%13%11%13%13%15%13%8%4%0-910-1920-2930-3940-4950-5960-6970-7980+
/View Population by Age Range dynamic table

Population by Age Group

61%
18-64
    39,123
    Under 18
    108,182
    18-64
    31,222
    65 and over
/View Population by Age Group dynamic table

Table: Population by Age Range

Age RangePopulation in Unincorporated Contra Costa County
TotalPercentage
0-919,44411%
10-1923,96813%
20-2919,38411%
30-3922,60613%
40-4923,45013%
50-5926,02115%
60-6922,70013%
70-7914,2928%
80+6,6624%

Table: Population by Age Group

Age GroupPopulation in Unincorporated Contra Costa County
TotalPercentage
Under 1839,12322%
18-64108,18261%
65 and over31,22217%
* For both charts above, the data is collected from the U.S. Census Bureau Decennial Data 2020, Demographic and Housing Characteristics File (DHC), P12 Sex by Age for Selected Age Categories. Figures for unincorporated areas were calculated by subtracting the sum of counts for incorporated places from totals for the county.

Sex and Age

In 2020, females outnumbered males by a moderate amount in Unincorporated Contra Costa County. Females 50-59 were the largest group by age, followed by males 50-59 and males 10-19. The biggest gap was in the 70-79 age group, where females were the larger share.

Population by Sex

51%
Female
    87,865
    Male
    90,662
    Female
/View Population by Sex dynamic table

Population by Sex and Age

03.5k7k10.5k14k0-910-1920-2930-3940-4950-5960-6970-7980+9,86112,2569,92411,04011,44412,74011,0286,6622,9109,58311,7129,46011,56612,00613,28111,6727,6303,752
03.5k7k10.5k14k0-910-1920-2930-3940-4950-5960-6970-7980+9,86112,2569,92411,04011,44412,74011,0286,6622,9109,58311,7129,46011,56612,00613,28111,6727,6303,752
14k10.5k7k3.5k03.5k7k10.5k14k0-910-1920-2930-3940-4950-5960-6970-7980+9,86112,2569,92411,04011,44412,74011,0286,6622,9109,58311,7129,46011,56612,00613,28111,6727,6303,752
/View Population by Sex and Age dynamic table
Male
Female

Table: Population by Sex

SexUnincorporated Contra Costa County
TotalPercentage
Male87,86549%
Female90,66251%

Table: Population by Sex and Age

Sex and AgeUnincorporated Contra Costa County
TotalPercentage
Male87,86549%
Male: 0-99,8616%
Male: 10-1912,2567%
Male: 20-299,9246%
Male: 30-3911,0406%
Male: 40-4911,4446%
Male: 50-5912,7407%
Male: 60-6911,0286%
Male: 70-796,6624%
Male: 80+2,9102%
Female90,66251%
Female: 0-99,5835%
Female: 10-1911,7127%
Female: 20-299,4605%
Female: 30-3911,5666%
Female: 40-4912,0067%
Female: 50-5913,2817%
Female: 60-6911,6727%
Female: 70-797,6304%
Female: 80+3,7522%
* For both charts above, the data is collected from the U.S. Census Bureau Decennial Data 2020, Demographic and Housing Characteristics File (DHC), P12 Sex by Age for Selected Age Categories. Figures for unincorporated areas were calculated by subtracting the sum of counts for incorporated places from totals for the county.

Race and Hispanic or Latino

45%
White (Not Hispanic or Latino)
In 2020, Unincorporated Contra Costa County had a diverse population with no race/ethnicity being a majority. White and Hispanic people were the largest groups, while Asian and other/multiracial residents were the next biggest segments of the population.

Population by Race and Hispanic or Latino

025k50k75k100kWhite*Black or African American*American Indian / Alaska Native*Asian*Native Hawaiian / Pacific Islander*Other / Multiracial*Hispanic or Latino (any race)45%6%<1%16%<1%6%27%
025k50k75k100kWhite*Black or African American*American Indian / Alaska Native*Asian*Native Hawaiian / Pacific Islander*Other / Multiracial*Hispanic or Latino (any race)45%6%<1%16%<1%6%27%
025k50k75k100kWhite*Black or African American*American Indian / Alaska Native*Asian*Native Hawaiian / Pacific Islander*Other / Multiracial*Hispanic or Latino (any race)45%6%<1%16%<1%6%27%
/View Population by Race and Hispanic or Latino dynamic table

Table: Population by Race and Hispanic or Latino

Race and Hispanic or LatinoPopulation in Unincorporated Contra Costa County
TotalPercentage
White80,12645%
Black or African American10,0426%
American Indian / Alaska Native422<1%
Asian27,66816%
Native Hawaiian / Pacific Islander661<1%
Other / Multiracial11,2246%
Hispanic or Latino (any race)48,38427%
* Categorized as Not Hispanic. This means that all the racial groups marked with an asterisk — White, Black or African American, American Indian / Alaska Native, Asian, Native Hawaiian / Pacific Islander, and Other / Multiracial — do not include individuals who identify as Hispanic or Latino. The "Hispanic or Latino (any race)" category is separate, as Hispanic/Latino is considered an ethnicity rather than a racial category. For the chart above, the data is collected from the U.S. Census Bureau Decennial Data 2020, Demographic and Housing Characteristics File (DHC), P5 Hispanic or Latino Origin by Race. Figures for unincorporated areas were calculated by subtracting the sum of counts for incorporated places from totals for the county.