Population Demographics for Jefferson County, Missouri in 2020, 2019
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| | Male | Female | Total | | Total Population | 108,846 | 109,887 | 218,733 | | White | 104,921 | 106,086 | 211,007 | | Hispanic or Latino | 1,776 | 1,632 | 3,408 | | Two or More Races | 1,477 | 1,472 | 2,949 | | Black or African American | 1,028 | 770 | 1,798 | | Asian | 591 | 826 | 1,417 | | Some Other Race | 474 | 362 | 836 | | American Indian | 331 | 346 | 677 | | Three or more races | 73 | 64 | 137 |
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| Total population in Jefferson County | | | Total Population: | 218,733 | | Male Population: | 108,846 | | Female Population: | 109,887 |
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| Median age in Jefferson County | | | Both sexes | 37 | | Male | 36 | | Female | 38 |
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| Population in households in Jefferson County | | | Total Population: | 216,750 | | Male Population: | 107,889 | | Under 5 years: | 7,700 | | 5 to 9 years: | 7,756 | | 10 to 14 years: | 7,907 | | 15 to 17 years: | 4,905 | | 18 and 19 years: | 2,867 | | 20 years: | 1,284 | | 21 years: | 1,279 | | 22 to 24 years: | 3,683 | | 25 to 29 years: | 6,893 | | 30 to 34 years: | 7,199 | | 35 to 39 years: | 7,268 | | 40 to 44 years: | 7,593 | | 45 to 49 years: | 9,151 | | 50 to 54 years: | 8,772 | | 55 to 59 years: | 7,139 | | 60 and 61 years: | 2,538 | | 62 to 64 years: | 3,281 | | 65 and 66 years: | 1,747 | | 67 to 69 years: | 2,440 | | 70 to 74 years: | 2,773 | | 75 to 79 years: | 1,886 | | 80 to 84 years: | 1,121 | | 85 years and over: | 707 | | Female Population: | 108,861 | | Under 5 years: | 7,271 | | 5 to 9 years: | 7,329 | | 10 to 14 years: | 7,534 | | 15 to 17 years: | 4,527 | | 18 and 19 years: | 2,731 | | 20 years: | 1,227 | | 21 years: | 1,145 | | 22 to 24 years: | 3,648 | | 25 to 29 years: | 7,024 | | 30 to 34 years: | 7,102 | | 35 to 39 years: | 7,428 | | 40 to 44 years: | 7,742 | | 45 to 49 years: | 9,261 | | 50 to 54 years: | 8,628 | | 55 to 59 years: | 7,410 | | 60 and 61 years: | 2,513 | | 62 to 64 years: | 3,509 | | 65 and 66 years: | 1,894 | | 67 to 69 years: | 2,628 | | 70 to 74 years: | 3,141 | | 75 to 79 years: | 2,307 | | 80 to 84 years: | 1,567 | | 85 years and over: | 1,295 |
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| Average household size in Jefferson County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Jefferson County | | | Total: | 81,700 | | Family led homes: | 60,031 | | Husband-wife family: | 46,193 | | Other family: | 13,838 | | Population of male led with no wife present: | 4,581 | | Population female led with no husband present: | 9,257 | | Population of Nonfamily homes: | 21,669 | | Population living alone: | 17,093 | | Population not living alone: | 4,576 |
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| Total occupied homes in Jefferson County with people under 18 years old: | | | Total: | 81,700 | | Population of homes with one or more people under 18 years: | 30,149 | | Population of family homes: | 29,714 | | Husband-wife family: | 20,699 | | Under 6 years only: | 4,953 | | Under 6 years and 6 to 17 years: | 4,538 | | 6 to 17 years only: | 11,208 | | Other family: | 9,015 | | Male householder, no wife present: | 2,947 | | Under 6 years only: | 790 | | Under 6 years and 6 to 17 years: | 494 | | 6 to 17 years only: | 1,663 | | Female led with no husband present: | 6,068 | | Under 6 years only: | 1,372 | | Under 6 years and 6 to 17 years: | 1,103 | | 6 to 17 years only: | 3,593 | | Nonfamily households: | 435 | | Male led households: | 366 | | Under 6 years only: | 74 | | Under 6 years and 6 to 17 years: | 31 | | 6 to 17 years only: | 261 | | Female led householder: | 69 | | Under 6 years only: | 14 | | Under 6 years and 6 to 17 years: | 7 | | 6 to 17 years only: | 48 | | Households with no people under 18 years: | 51,551 | | Family households: | 30,317 | | Husband-wife family: | 25,494 | | Other family: | 4,823 | | Male led with no wife present: | 1,634 | | Female led with no husband present: | 3,189 | | Nonfamily households: | 21,234 | | Male led householder: | 10,793 | | Female led householder: | 10,441 |
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| Total number led homes in Jefferson County, by type | | | Total Home Population: | 81,700 | | Population of Family homes: | 60,031 | | Population of 15 to 24 year olds: | 1,456 | | Population of 25 to 34 year olds: | 9,779 | | Population of 35 to 44 year olds: | 13,055 | | Population of 45 to 54 year olds: | 15,279 | | Population of 55 to 59 year olds: | 6,043 | | Population of 60 to 64 year olds: | 4,983 | | Population of 65 to 74 year olds: | 6,284 | | Population of 75 to 84 year olds: | 2,613 | | Population of 85 year olds and over: | 539 | | Population of Nonfamily Homes: | 21,669 | | Population of 15 to 24 year olds: | 1,083 | | Population of 25 to 34 year olds: | 2,782 | | Population of 35 to 44 year olds: | 2,530 | | Population of 45 to 54 year olds: | 4,692 | | Population of 55 to 59 year olds: | 2,355 | | Population of 60 to 64 year olds: | 2,065 | | Population of 65 to 74 year olds: | 3,092 | | Population of 75 to 84 year olds: | 2,202 | | Population of 85 year olds and over: | 868 |
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| households in Jefferson County containing people over 60 | | | Total Population: | 81,700 | | Population of homes with one or more people 60 years and over: | 24,861 | | 1-person household: | 7,554 | | 2-or-more-person household: | 17,307 | | Family households: | 16,484 | | Nonfamily households: | 823 | | Population of homes with no people 60 years and over: | 56,839 | | 1-person household: | 9,539 | | 2-or-more-person household: | 47,300 | | Family homes: | 43,547 | | Nonfamily homes: | 3,753 |
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| homes in Jefferson County with multiple generations. | | | Total Population: | 81,700 | | Home has three or more generations: | 3,260 | | Home does not have three or more generations: | 78,440 |
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| Unmarried population in Jefferson County under 18 years old in homes | | | Total Population: | 54,908 | | Unmarried partner of home lead present: | 5,232 | | In family homes: | 4,780 | | Population of male led and male partner homes: | 104 | | Population of male led and female partner households: | 2,299 | | Population of female led and female partner households: | 189 | | Population of female led and male partner households: | 2,188 | | In nonfamily homes: | 452 | | Population of male led and male partner homes: | 1 | | Population of male led and female partner homes: | 410 | | Population of female led and female partner homes: | 9 | | Population of female led and male partner homes: | 32 | | No unmarried partner of home lead present: | 49,676 | | In family homes: | 49,506 | | Population of husband-wife family homes: | 39,012 | | Population of male lead with no wife present, family homes: | 2,498 | | Population of female lead with no husband present, family homes: | 7,996 | | In nonfamily homes: | 170 |
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| Population in families living in Jefferson County | | | Total Population: | 183,768 | | Population Under 18 years: | 53,581 | | Population 18 years and over: | 130,187 |
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| How long in Jefferson County have lived in one place. | | | Total: | 81,700 | | Population of Owner occupied homes: | 66,836 | | Family home: | 51,615 | | Nonfamily homess: | 15,221 | | Male led home: | 7,814 | | Living alone: | 5,884 | | Not living alone: | 1,930 | | Female led home: | 7,407 | | Living alone: | 6,220 | | Not living alone: | 1,187 | | Population of Renter occupied homes: | 14,864 | | Family run homes: | 8,416 | | Husband-wife family: | 3,874 | | Other family: | 4,542 | | Male led with no wife present: | 1,280 | | Female led with no husband present: | 3,262 | | Nonfamily Homes: | 6,448 | | Male led homes: | 3,345 | | Male living alone: | 2,473 | | Male not living alone: | 872 | | Female led homes: | 3,103 | | Females living alone: | 2,516 | | Females not living alone: | 587 |
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