Population Demographics for St Louis County, Missouri in 2020, 2019
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| | Male | Female | Total | | Total Population | 472,903 | 526,051 | 998,954 | | White | 337,018 | 364,930 | 701,948 | | Black or African American | 104,595 | 128,434 | 233,029 | | Asian | 16,657 | 17,940 | 34,597 | | Hispanic or Latino | 12,819 | 12,205 | 25,024 | | Two or More Races | 8,915 | 9,681 | 18,596 | | Some Other Race | 4,594 | 3,921 | 8,515 | | American Indian | 975 | 987 | 1,962 | | Three or more races | 692 | 856 | 1,548 | | Native Hawaiian Pacific Islander | 149 | 158 | 307 |
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| Total population in St Louis County | | | Total Population: | 998,954 | | Male Population: | 472,903 | | Female Population: | 526,051 |
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| Median age in St Louis County | | | Both sexes | 39 | | Male | 37 | | Female | 41 |
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| Population in households in St Louis County | | | Total Population: | 979,500 | | Male Population: | 463,893 | | Under 5 years: | 29,876 | | 5 to 9 years: | 31,990 | | 10 to 14 years: | 34,664 | | 15 to 17 years: | 22,580 | | 18 and 19 years: | 11,781 | | 20 years: | 5,076 | | 21 years: | 5,166 | | 22 to 24 years: | 17,493 | | 25 to 29 years: | 30,398 | | 30 to 34 years: | 27,256 | | 35 to 39 years: | 27,256 | | 40 to 44 years: | 29,916 | | 45 to 49 years: | 35,520 | | 50 to 54 years: | 36,934 | | 55 to 59 years: | 32,601 | | 60 and 61 years: | 11,272 | | 62 to 64 years: | 15,078 | | 65 and 66 years: | 8,077 | | 67 to 69 years: | 10,782 | | 70 to 74 years: | 13,691 | | 75 to 79 years: | 11,272 | | 80 to 84 years: | 8,627 | | 85 years and over: | 6,587 | | Female Population: | 515,607 | | Under 5 years: | 28,655 | | 5 to 9 years: | 30,898 | | 10 to 14 years: | 33,031 | | 15 to 17 years: | 21,519 | | 18 and 19 years: | 11,144 | | 20 years: | 5,071 | | 21 years: | 5,330 | | 22 to 24 years: | 18,956 | | 25 to 29 years: | 32,784 | | 30 to 34 years: | 30,285 | | 35 to 39 years: | 30,946 | | 40 to 44 years: | 33,759 | | 45 to 49 years: | 40,436 | | 50 to 54 years: | 41,617 | | 55 to 59 years: | 37,065 | | 60 and 61 years: | 13,485 | | 62 to 64 years: | 18,087 | | 65 and 66 years: | 9,649 | | 67 to 69 years: | 13,461 | | 70 to 74 years: | 17,547 | | 75 to 79 years: | 15,631 | | 80 to 84 years: | 13,424 | | 85 years and over: | 12,827 |
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| Average household size in St Louis County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in St Louis County | | | Total: | 404,765 | | Family led homes: | 263,423 | | Husband-wife family: | 189,432 | | Other family: | 73,991 | | Population of male led with no wife present: | 16,338 | | Population female led with no husband present: | 57,653 | | Population of Nonfamily homes: | 141,342 | | Population living alone: | 119,346 | | Population not living alone: | 21,996 |
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| Total occupied homes in St Louis County with people under 18 years old: | | | Total: | 404,765 | | Population of homes with one or more people under 18 years: | 126,823 | | Population of family homes: | 125,893 | | Husband-wife family: | 80,283 | | Under 6 years only: | 18,305 | | Under 6 years and 6 to 17 years: | 15,708 | | 6 to 17 years only: | 46,270 | | Other family: | 45,610 | | Male householder, no wife present: | 8,956 | | Under 6 years only: | 2,264 | | Under 6 years and 6 to 17 years: | 1,290 | | 6 to 17 years only: | 5,402 | | Female led with no husband present: | 36,654 | | Under 6 years only: | 7,405 | | Under 6 years and 6 to 17 years: | 7,046 | | 6 to 17 years only: | 22,203 | | Nonfamily households: | 930 | | Male led households: | 700 | | Under 6 years only: | 158 | | Under 6 years and 6 to 17 years: | 61 | | 6 to 17 years only: | 481 | | Female led householder: | 230 | | Under 6 years only: | 52 | | Under 6 years and 6 to 17 years: | 21 | | 6 to 17 years only: | 157 | | Households with no people under 18 years: | 277,942 | | Family households: | 137,530 | | Husband-wife family: | 109,149 | | Other family: | 28,381 | | Male led with no wife present: | 7,382 | | Female led with no husband present: | 20,999 | | Nonfamily households: | 140,412 | | Male led householder: | 58,240 | | Female led householder: | 82,172 |
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| Total number led homes in St Louis County, by type | | | Total Home Population: | 404,765 | | Population of Family homes: | 263,423 | | Population of 15 to 24 year olds: | 5,636 | | Population of 25 to 34 year olds: | 36,640 | | Population of 35 to 44 year olds: | 52,149 | | Population of 45 to 54 year olds: | 64,909 | | Population of 55 to 59 year olds: | 28,164 | | Population of 60 to 64 year olds: | 23,542 | | Population of 65 to 74 year olds: | 29,621 | | Population of 75 to 84 year olds: | 17,834 | | Population of 85 year olds and over: | 4,928 | | Population of Nonfamily Homes: | 141,342 | | Population of 15 to 24 year olds: | 9,242 | | Population of 25 to 34 year olds: | 22,004 | | Population of 35 to 44 year olds: | 14,595 | | Population of 45 to 54 year olds: | 23,825 | | Population of 55 to 59 year olds: | 13,539 | | Population of 60 to 64 year olds: | 12,392 | | Population of 65 to 74 year olds: | 18,079 | | Population of 75 to 84 year olds: | 17,381 | | Population of 85 year olds and over: | 10,285 |
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| households in St Louis County containing people over 60 | | | Total Population: | 404,765 | | Population of homes with one or more people 60 years and over: | 143,797 | | 1-person household: | 55,149 | | 2-or-more-person household: | 88,648 | | Family households: | 84,981 | | Nonfamily households: | 3,667 | | Population of homes with no people 60 years and over: | 260,968 | | 1-person household: | 64,197 | | 2-or-more-person household: | 196,771 | | Family homes: | 178,442 | | Nonfamily homes: | 18,329 |
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| homes in St Louis County with multiple generations. | | | Total Population: | 404,765 | | Home has three or more generations: | 13,682 | | Home does not have three or more generations: | 391,083 |
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| Unmarried population in St Louis County under 18 years old in homes | | | Total Population: | 233,110 | | Unmarried partner of home lead present: | 15,301 | | In family homes: | 14,506 | | Population of male led and male partner homes: | 336 | | Population of male led and female partner households: | 5,321 | | Population of female led and female partner households: | 756 | | Population of female led and male partner households: | 8,093 | | In nonfamily homes: | 795 | | Population of male led and male partner homes: | 1 | | Population of male led and female partner homes: | 708 | | Population of female led and female partner homes: | 20 | | Population of female led and male partner homes: | 66 | | No unmarried partner of home lead present: | 217,809 | | In family homes: | 217,346 | | Population of husband-wife family homes: | 152,594 | | Population of male lead with no wife present, family homes: | 8,938 | | Population of female lead with no husband present, family homes: | 55,814 | | In nonfamily homes: | 463 |
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| Population in families living in St Louis County | | | Total Population: | 794,774 | | Population Under 18 years: | 230,419 | | Population 18 years and over: | 564,355 |
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| How long in St Louis County have lived in one place. | | | Total: | 404,765 | | Population of Owner occupied homes: | 291,937 | | Family home: | 209,915 | | Nonfamily homess: | 82,022 | | Male led home: | 31,997 | | Living alone: | 26,148 | | Not living alone: | 5,849 | | Female led home: | 50,025 | | Living alone: | 45,174 | | Not living alone: | 4,851 | | Population of Renter occupied homes: | 112,828 | | Family run homes: | 53,508 | | Husband-wife family: | 21,207 | | Other family: | 32,301 | | Male led with no wife present: | 6,082 | | Female led with no husband present: | 26,219 | | Nonfamily Homes: | 59,320 | | Male led homes: | 26,943 | | Male living alone: | 20,885 | | Male not living alone: | 6,058 | | Female led homes: | 32,377 | | Females living alone: | 27,139 | | Females not living alone: | 5,238 |
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