Population Demographics for St Clair County, Illinois in 2020, 2019
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| | Male | Female | Total | | Total Population | 129,976 | 140,080 | 270,056 | | White | 85,751 | 88,707 | 174,458 | | Black or African American | 37,948 | 44,354 | 82,302 | | Hispanic or Latino | 4,522 | 4,263 | 8,785 | | Two or More Races | 2,877 | 3,131 | 6,008 | | Asian | 1,266 | 2,010 | 3,276 | | Some Other Race | 1,711 | 1,422 | 3,133 | | American Indian | 316 | 336 | 652 | | Three or more races | 203 | 278 | 481 | | Native Hawaiian Pacific Islander | 107 | 120 | 227 |
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| Total population in St Clair County | | | Total Population: | 270,056 | | Male Population: | 129,976 | | Female Population: | 140,080 |
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| Median age in St Clair County | | | Both sexes | 36 | | Male | 35 | | Female | 38 |
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| Population in households in St Clair County | | | Total Population: | 265,605 | | Male Population: | 127,411 | | Under 5 years: | 9,405 | | 5 to 9 years: | 9,565 | | 10 to 14 years: | 9,613 | | 15 to 17 years: | 6,257 | | 18 and 19 years: | 3,588 | | 20 years: | 1,665 | | 21 years: | 1,640 | | 22 to 24 years: | 4,844 | | 25 to 29 years: | 8,600 | | 30 to 34 years: | 7,957 | | 35 to 39 years: | 8,141 | | 40 to 44 years: | 8,386 | | 45 to 49 years: | 9,950 | | 50 to 54 years: | 9,734 | | 55 to 59 years: | 8,270 | | 60 and 61 years: | 2,724 | | 62 to 64 years: | 3,716 | | 65 and 66 years: | 1,946 | | 67 to 69 years: | 2,518 | | 70 to 74 years: | 3,144 | | 75 to 79 years: | 2,582 | | 80 to 84 years: | 1,938 | | 85 years and over: | 1,228 | | Female Population: | 138,194 | | Under 5 years: | 8,947 | | 5 to 9 years: | 9,084 | | 10 to 14 years: | 9,531 | | 15 to 17 years: | 6,035 | | 18 and 19 years: | 3,462 | | 20 years: | 1,657 | | 21 years: | 1,703 | | 22 to 24 years: | 5,343 | | 25 to 29 years: | 9,188 | | 30 to 34 years: | 8,908 | | 35 to 39 years: | 9,021 | | 40 to 44 years: | 9,281 | | 45 to 49 years: | 10,567 | | 50 to 54 years: | 10,578 | | 55 to 59 years: | 9,092 | | 60 and 61 years: | 3,011 | | 62 to 64 years: | 4,018 | | 65 and 66 years: | 2,217 | | 67 to 69 years: | 2,950 | | 70 to 74 years: | 4,181 | | 75 to 79 years: | 3,657 | | 80 to 84 years: | 3,041 | | 85 years and over: | 2,722 |
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| Average household size in St Clair County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in St Clair County | | | Total: | 105,045 | | Family led homes: | 70,689 | | Husband-wife family: | 46,846 | | Other family: | 23,843 | | Population of male led with no wife present: | 5,254 | | Population female led with no husband present: | 18,589 | | Population of Nonfamily homes: | 34,356 | | Population living alone: | 28,916 | | Population not living alone: | 5,440 |
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| Total occupied homes in St Clair County with people under 18 years old: | | | Total: | 105,045 | | Population of homes with one or more people under 18 years: | 36,427 | | Population of family homes: | 36,088 | | Husband-wife family: | 20,638 | | Under 6 years only: | 4,883 | | Under 6 years and 6 to 17 years: | 4,332 | | 6 to 17 years only: | 11,423 | | Other family: | 15,450 | | Male householder, no wife present: | 2,974 | | Under 6 years only: | 808 | | Under 6 years and 6 to 17 years: | 472 | | 6 to 17 years only: | 1,694 | | Female led with no husband present: | 12,476 | | Under 6 years only: | 2,757 | | Under 6 years and 6 to 17 years: | 2,844 | | 6 to 17 years only: | 6,875 | | Nonfamily households: | 339 | | Male led households: | 260 | | Under 6 years only: | 65 | | Under 6 years and 6 to 17 years: | 22 | | 6 to 17 years only: | 173 | | Female led householder: | 79 | | Under 6 years only: | 25 | | Under 6 years and 6 to 17 years: | 7 | | 6 to 17 years only: | 47 | | Households with no people under 18 years: | 68,618 | | Family households: | 34,601 | | Husband-wife family: | 26,208 | | Other family: | 8,393 | | Male led with no wife present: | 2,280 | | Female led with no husband present: | 6,113 | | Nonfamily households: | 34,017 | | Male led householder: | 15,907 | | Female led householder: | 18,110 |
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| Total number led homes in St Clair County, by type | | | Total Home Population: | 105,045 | | Population of Family homes: | 70,689 | | Population of 15 to 24 year olds: | 2,425 | | Population of 25 to 34 year olds: | 11,829 | | Population of 35 to 44 year olds: | 15,099 | | Population of 45 to 54 year olds: | 16,882 | | Population of 55 to 59 year olds: | 6,921 | | Population of 60 to 64 year olds: | 5,565 | | Population of 65 to 74 year olds: | 6,768 | | Population of 75 to 84 year olds: | 4,158 | | Population of 85 year olds and over: | 1,042 | | Population of Nonfamily Homes: | 34,356 | | Population of 15 to 24 year olds: | 1,947 | | Population of 25 to 34 year olds: | 4,810 | | Population of 35 to 44 year olds: | 4,038 | | Population of 45 to 54 year olds: | 6,526 | | Population of 55 to 59 year olds: | 3,432 | | Population of 60 to 64 year olds: | 2,915 | | Population of 65 to 74 year olds: | 4,555 | | Population of 75 to 84 year olds: | 4,088 | | Population of 85 year olds and over: | 2,045 |
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| households in St Clair County containing people over 60 | | | Total Population: | 105,045 | | Population of homes with one or more people 60 years and over: | 33,717 | | 1-person household: | 12,834 | | 2-or-more-person household: | 20,883 | | Family households: | 19,953 | | Nonfamily households: | 930 | | Population of homes with no people 60 years and over: | 71,328 | | 1-person household: | 16,082 | | 2-or-more-person household: | 55,246 | | Family homes: | 50,736 | | Nonfamily homes: | 4,510 |
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| homes in St Clair County with multiple generations. | | | Total Population: | 105,045 | | Home has three or more generations: | 4,583 | | Home does not have three or more generations: | 100,462 |
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| Unmarried population in St Clair County under 18 years old in homes | | | Total Population: | 68,398 | | Unmarried partner of home lead present: | 6,135 | | In family homes: | 5,815 | | Population of male led and male partner homes: | 105 | | Population of male led and female partner households: | 2,069 | | Population of female led and female partner households: | 232 | | Population of female led and male partner households: | 3,409 | | In nonfamily homes: | 320 | | Population of male led and male partner homes: | 2 | | Population of male led and female partner homes: | 283 | | Population of female led and female partner homes: | 10 | | Population of female led and male partner homes: | 25 | | No unmarried partner of home lead present: | 62,263 | | In family homes: | 62,108 | | Population of husband-wife family homes: | 39,021 | | Population of male lead with no wife present, family homes: | 2,746 | | Population of female lead with no husband present, family homes: | 20,341 | | In nonfamily homes: | 155 |
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| Population in families living in St Clair County | | | Total Population: | 218,289 | | Population Under 18 years: | 67,350 | | Population 18 years and over: | 150,939 |
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| How long in St Clair County have lived in one place. | | | Total: | 105,045 | | Population of Owner occupied homes: | 69,646 | | Family home: | 51,105 | | Nonfamily homess: | 18,541 | | Male led home: | 8,315 | | Living alone: | 6,649 | | Not living alone: | 1,666 | | Female led home: | 10,226 | | Living alone: | 9,143 | | Not living alone: | 1,083 | | Population of Renter occupied homes: | 35,399 | | Family run homes: | 19,584 | | Husband-wife family: | 7,312 | | Other family: | 12,272 | | Male led with no wife present: | 2,083 | | Female led with no husband present: | 10,189 | | Nonfamily Homes: | 15,815 | | Male led homes: | 7,852 | | Male living alone: | 6,289 | | Male not living alone: | 1,563 | | Female led homes: | 7,963 | | Females living alone: | 6,835 | | Females not living alone: | 1,128 |
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