Population Demographics for Contra Costa County, California in 2020, 2019
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| | Race | Population | % of Total | | Total Population | 1,049,025 | 100 | | White | 614,512 | 58 | | Hispanic or Latino | 255,560 | 24 | | Asian | 151,469 | 14 | | Some Other Race | 112,691 | 10 | | Black or African American | 97,161 | 9 | | Two or More Races | 62,225 | 5 | | American Indian | 6,122 | Below 1% | | Three or more races | 5,849 | Below 1% | | Native Hawaiian Pacific Islander | 4,845 | Below 1% | | Native Hawaiian | 648 | Below 1% |
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| | Male | Female | Total | | Total Population | 511,526 | 537,499 | 1,049,025 | | White | 301,629 | 312,883 | 614,512 | | Hispanic or Latino | 128,889 | 126,671 | 255,560 | | Asian | 71,121 | 80,348 | 151,469 | | Some Other Race | 57,796 | 54,895 | 112,691 | | Black or African American | 45,053 | 52,108 | 97,161 | | Two or More Races | 30,609 | 31,616 | 62,225 | | American Indian | 3,053 | 3,069 | 6,122 | | Three or more races | 2,796 | 3,053 | 5,849 | | Native Hawaiian Pacific Islander | 2,265 | 2,580 | 4,845 | | Native Hawaiian | 299 | 349 | 648 |
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| Total population in Contra Costa County | | | Total Population: | 1,049,025 | | Male Population: | 511,526 | | Female Population: | 537,499 |
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| Median age in Contra Costa County | | | Both sexes | 38 | | Male | 37 | | Female | 39 |
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| Population in households in Contra Costa County | | | Total Population: | 1,038,711 | | Male Population: | 506,195 | | Under 5 years: | 33,939 | | 5 to 9 years: | 36,946 | | 10 to 14 years: | 37,965 | | 15 to 17 years: | 23,764 | | 18 and 19 years: | 13,620 | | 20 years: | 6,214 | | 21 years: | 5,757 | | 22 to 24 years: | 18,113 | | 25 to 29 years: | 31,962 | | 30 to 34 years: | 31,272 | | 35 to 39 years: | 33,978 | | 40 to 44 years: | 37,711 | | 45 to 49 years: | 40,359 | | 50 to 54 years: | 38,519 | | 55 to 59 years: | 32,989 | | 60 and 61 years: | 11,818 | | 62 to 64 years: | 16,027 | | 65 and 66 years: | 8,470 | | 67 to 69 years: | 10,573 | | 70 to 74 years: | 13,394 | | 75 to 79 years: | 9,614 | | 80 to 84 years: | 7,004 | | 85 years and over: | 6,187 | | Female Population: | 532,516 | | Under 5 years: | 32,966 | | 5 to 9 years: | 35,274 | | 10 to 14 years: | 36,329 | | 15 to 17 years: | 22,602 | | 18 and 19 years: | 12,311 | | 20 years: | 5,805 | | 21 years: | 5,360 | | 22 to 24 years: | 17,429 | | 25 to 29 years: | 32,293 | | 30 to 34 years: | 33,099 | | 35 to 39 years: | 36,121 | | 40 to 44 years: | 39,941 | | 45 to 49 years: | 43,078 | | 50 to 54 years: | 40,987 | | 55 to 59 years: | 35,947 | | 60 and 61 years: | 13,149 | | 62 to 64 years: | 18,004 | | 65 and 66 years: | 9,623 | | 67 to 69 years: | 12,326 | | 70 to 74 years: | 15,750 | | 75 to 79 years: | 12,401 | | 80 to 84 years: | 10,355 | | 85 years and over: | 11,366 |
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| Average household size in Contra Costa County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 2 |
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| Number of occupied homes in Contra Costa County | | | Total: | 375,364 | | Family led homes: | 265,280 | | Husband-wife family: | 199,021 | | Other family: | 66,259 | | Population of male led with no wife present: | 19,553 | | Population female led with no husband present: | 46,706 | | Population of Nonfamily homes: | 110,084 | | Population living alone: | 85,055 | | Population not living alone: | 25,029 |
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| Total occupied homes in Contra Costa County with people under 18 years old: | | | Total: | 375,364 | | Population of homes with one or more people under 18 years: | 140,058 | | Population of family homes: | 138,944 | | Husband-wife family: | 99,268 | | Under 6 years only: | 22,193 | | Under 6 years and 6 to 17 years: | 22,468 | | 6 to 17 years only: | 54,607 | | Other family: | 39,676 | | Male householder, no wife present: | 11,102 | | Under 6 years only: | 2,727 | | Under 6 years and 6 to 17 years: | 2,044 | | 6 to 17 years only: | 6,331 | | Female led with no husband present: | 28,574 | | Under 6 years only: | 5,453 | | Under 6 years and 6 to 17 years: | 5,348 | | 6 to 17 years only: | 17,773 | | Nonfamily households: | 1,114 | | Male led households: | 792 | | Under 6 years only: | 161 | | Under 6 years and 6 to 17 years: | 72 | | 6 to 17 years only: | 559 | | Female led householder: | 322 | | Under 6 years only: | 69 | | Under 6 years and 6 to 17 years: | 17 | | 6 to 17 years only: | 236 | | Households with no people under 18 years: | 235,306 | | Family households: | 126,336 | | Husband-wife family: | 99,753 | | Other family: | 26,583 | | Male led with no wife present: | 8,451 | | Female led with no husband present: | 18,132 | | Nonfamily households: | 108,970 | | Male led householder: | 47,603 | | Female led householder: | 61,367 |
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| Total number led homes in Contra Costa County, by type | | | Total Home Population: | 375,364 | | Population of Family homes: | 265,280 | | Population of 15 to 24 year olds: | 4,836 | | Population of 25 to 34 year olds: | 34,278 | | Population of 35 to 44 year olds: | 61,360 | | Population of 45 to 54 year olds: | 69,133 | | Population of 55 to 59 year olds: | 27,723 | | Population of 60 to 64 year olds: | 22,830 | | Population of 65 to 74 year olds: | 26,942 | | Population of 75 to 84 year olds: | 13,693 | | Population of 85 year olds and over: | 4,485 | | Population of Nonfamily Homes: | 110,084 | | Population of 15 to 24 year olds: | 4,579 | | Population of 25 to 34 year olds: | 14,754 | | Population of 35 to 44 year olds: | 12,597 | | Population of 45 to 54 year olds: | 20,015 | | Population of 55 to 59 year olds: | 11,378 | | Population of 60 to 64 year olds: | 11,545 | | Population of 65 to 74 year olds: | 15,160 | | Population of 75 to 84 year olds: | 11,937 | | Population of 85 year olds and over: | 8,119 |
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| households in Contra Costa County containing people over 60 | | | Total Population: | 375,364 | | Population of homes with one or more people 60 years and over: | 132,916 | | 1-person household: | 41,809 | | 2-or-more-person household: | 91,107 | | Family households: | 85,014 | | Nonfamily households: | 6,093 | | Population of homes with no people 60 years and over: | 242,448 | | 1-person household: | 43,246 | | 2-or-more-person household: | 199,202 | | Family homes: | 180,266 | | Nonfamily homes: | 18,936 |
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| homes in Contra Costa County with multiple generations. | | | Total Population: | 375,364 | | Home has three or more generations: | 19,835 | | Home does not have three or more generations: | 355,529 |
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| Unmarried population in Contra Costa County under 18 years old in homes | | | Total Population: | 259,676 | | Total Population: | 259,676 | | Unmarried partner of home lead present: | 17,932 | | Unmarried partner of home lead present: | 17,932 | | In family homes: | 17,218 | | In family homes: | 17,218 | | Population of male led and male partner homes: | 642 | | Population of male led and male partner homes: | 642 | | Population of male led and female partner households: | 7,787 | | Population of male led and female partner households: | 7,787 | | Population of female led and female partner households: | 1,173 | | Population of female led and female partner households: | 1,173 | | Population of female led and male partner households: | 7,616 | | Population of female led and male partner households: | 7,616 | | In nonfamily homes: | 714 | | In nonfamily homes: | 714 | | Population of male led and male partner homes: | 28 | | Population of male led and male partner homes: | 28 | | Population of male led and female partner homes: | 575 | | Population of male led and female partner homes: | 575 | | Population of female led and female partner homes: | 26 | | Population of female led and female partner homes: | 26 | | Population of female led and male partner homes: | 85 | | Population of female led and male partner homes: | 85 | | No unmarried partner of home lead present: | 241,744 | | No unmarried partner of home lead present: | 241,744 | | In family homes: | 240,900 | | In family homes: | 240,900 | | Population of husband-wife family homes: | 189,715 | | Population of husband-wife family homes: | 189,715 | | Population of male lead with no wife present, family homes: | 10,529 | | Population of male lead with no wife present, family homes: | 10,529 | | Population of female lead with no husband present, family homes: | 40,656 | | Population of female lead with no husband present, family homes: | 40,656 | | In nonfamily homes: | 844 | | In nonfamily homes: | 844 |
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| Population in families living in Contra Costa County | | | Total Population: | 866,090 | | Total Population: | 866,090 | | Population Under 18 years: | 255,515 | | Population Under 18 years: | 255,515 | | Population 18 years and over: | 610,575 | | Population 18 years and over: | 610,575 |
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| How long in Contra Costa County have lived in one place. | | | Total: | 375,364 | | Population of Owner occupied homes: | 251,904 | | Family home: | 190,371 | | Nonfamily homess: | 61,533 | | Male led home: | 24,971 | | Living alone: | 18,482 | | Not living alone: | 6,489 | | Female led home: | 36,562 | | Living alone: | 30,839 | | Not living alone: | 5,723 | | Population of Renter occupied homes: | 123,460 | | Family run homes: | 74,909 | | Husband-wife family: | 41,400 | | Other family: | 33,509 | | Male led with no wife present: | 9,322 | | Female led with no husband present: | 24,187 | | Nonfamily Homes: | 48,551 | | Male led homes: | 23,424 | | Male living alone: | 15,996 | | Male not living alone: | 7,428 | | Female led homes: | 25,127 | | Females living alone: | 19,738 | | Females not living alone: | 5,389 |
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