Population Demographics for St Clair County, Missouri in 2020, 2019
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| Total population in St Clair County | | Total Population: | 9,805 | Male Population: | 4,947 | Female Population: | 4,858 |
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| Median age in St Clair County | | Both sexes | 48 | Male | 47 | Female | 49 |
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| Population in households in St Clair County | | Total Population: | 9,598 | Male Population: | 4,825 | Under 5 years: | 251 | 5 to 9 years: | 266 | 10 to 14 years: | 313 | 15 to 17 years: | 165 | 18 and 19 years: | 140 | 20 years: | 49 | 21 years: | 46 | 22 to 24 years: | 118 | 25 to 29 years: | 201 | 30 to 34 years: | 175 | 35 to 39 years: | 258 | 40 to 44 years: | 260 | 45 to 49 years: | 396 | 50 to 54 years: | 393 | 55 to 59 years: | 382 | 60 and 61 years: | 168 | 62 to 64 years: | 195 | 65 and 66 years: | 142 | 67 to 69 years: | 213 | 70 to 74 years: | 303 | 75 to 79 years: | 194 | 80 to 84 years: | 115 | 85 years and over: | 82 | Female Population: | 4,773 | Under 5 years: | 237 | 5 to 9 years: | 252 | 10 to 14 years: | 277 | 15 to 17 years: | 199 | 18 and 19 years: | 84 | 20 years: | 30 | 21 years: | 44 | 22 to 24 years: | 117 | 25 to 29 years: | 189 | 30 to 34 years: | 204 | 35 to 39 years: | 238 | 40 to 44 years: | 284 | 45 to 49 years: | 334 | 50 to 54 years: | 389 | 55 to 59 years: | 353 | 60 and 61 years: | 164 | 62 to 64 years: | 236 | 65 and 66 years: | 144 | 67 to 69 years: | 209 | 70 to 74 years: | 289 | 75 to 79 years: | 207 | 80 to 84 years: | 131 | 85 years and over: | 162 |
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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: | 4,161 | Family led homes: | 2,737 | Husband-wife family: | 2,217 | Other family: | 520 | Population of male led with no wife present: | 175 | Population female led with no husband present: | 345 | Population of Nonfamily homes: | 1,424 | Population living alone: | 1,234 | Population not living alone: | 190 |
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| Total occupied homes in St Clair County with people under 18 years old: | | Total: | 4,161 | Population of homes with one or more people under 18 years: | 1,018 | Population of family homes: | 1,003 | Husband-wife family: | 701 | Under 6 years only: | 127 | Under 6 years and 6 to 17 years: | 165 | 6 to 17 years only: | 409 | Other family: | 302 | Male householder, no wife present: | 106 | Under 6 years only: | 30 | Under 6 years and 6 to 17 years: | 17 | 6 to 17 years only: | 59 | Female led with no husband present: | 196 | Under 6 years only: | 43 | Under 6 years and 6 to 17 years: | 30 | 6 to 17 years only: | 123 | Nonfamily households: | 15 | Male led households: | 12 | Under 6 years only: | 2 | Under 6 years and 6 to 17 years: | 0 | 6 to 17 years only: | 10 | Female led householder: | 3 | Under 6 years only: | 0 | Under 6 years and 6 to 17 years: | 1 | 6 to 17 years only: | 2 | Households with no people under 18 years: | 3,143 | Family households: | 1,734 | Husband-wife family: | 1,516 | Other family: | 218 | Male led with no wife present: | 69 | Female led with no husband present: | 149 | Nonfamily households: | 1,409 | Male led householder: | 761 | Female led householder: | 648 |
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| Total number led homes in St Clair County, by type | | Total Home Population: | 4,161 | Population of Family homes: | 2,737 | Population of 15 to 24 year olds: | 71 | Population of 25 to 34 year olds: | 276 | Population of 35 to 44 year olds: | 422 | Population of 45 to 54 year olds: | 570 | Population of 55 to 59 year olds: | 279 | Population of 60 to 64 year olds: | 277 | Population of 65 to 74 year olds: | 535 | Population of 75 to 84 year olds: | 246 | Population of 85 year olds and over: | 61 | Population of Nonfamily Homes: | 1,424 | Population of 15 to 24 year olds: | 39 | Population of 25 to 34 year olds: | 54 | Population of 35 to 44 year olds: | 106 | Population of 45 to 54 year olds: | 257 | Population of 55 to 59 year olds: | 142 | Population of 60 to 64 year olds: | 147 | Population of 65 to 74 year olds: | 313 | Population of 75 to 84 year olds: | 222 | Population of 85 year olds and over: | 144 |
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| households in St Clair County containing people over 60 | | Total Population: | 4,161 | Population of homes with one or more people 60 years and over: | 2,056 | 1-person household: | 760 | 2-or-more-person household: | 1,296 | Family households: | 1,211 | Nonfamily households: | 85 | Population of homes with no people 60 years and over: | 2,105 | 1-person household: | 474 | 2-or-more-person household: | 1,631 | Family homes: | 1,526 | Nonfamily homes: | 105 |
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| homes in St Clair County with multiple generations. | | Total Population: | 4,161 | Home has three or more generations: | 123 | Home does not have three or more generations: | 4,038 |
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| Unmarried population in St Clair County under 18 years old in homes | | Total Population: | 1,958 | Unmarried partner of home lead present: | 220 | In family homes: | 206 | Population of male led and male partner homes: | 8 | Population of male led and female partner households: | 82 | Population of female led and female partner households: | 6 | Population of female led and male partner households: | 110 | In nonfamily homes: | 14 | Population of male led and male partner homes: | 0 | Population of male led and female partner homes: | 13 | Population of female led and female partner homes: | 0 | Population of female led and male partner homes: | 1 | No unmarried partner of home lead present: | 1,738 | In family homes: | 1,732 | Population of husband-wife family homes: | 1,423 | Population of male lead with no wife present, family homes: | 74 | Population of female lead with no husband present, family homes: | 235 | In nonfamily homes: | 6 |
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| Population in families living in St Clair County | | Total Population: | 7,739 | Population Under 18 years: | 1,913 | Population 18 years and over: | 5,826 |
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| How long in St Clair County have lived in one place. | | Total: | 4,161 | Population of Owner occupied homes: | 3,281 | Family home: | 2,304 | Nonfamily homess: | 977 | Male led home: | 534 | Living alone: | 425 | Not living alone: | 109 | Female led home: | 443 | Living alone: | 399 | Not living alone: | 44 | Population of Renter occupied homes: | 880 | Family run homes: | 433 | Husband-wife family: | 270 | Other family: | 163 | Male led with no wife present: | 39 | Female led with no husband present: | 124 | Nonfamily Homes: | 447 | Male led homes: | 239 | Male living alone: | 211 | Male not living alone: | 28 | Female led homes: | 208 | Females living alone: | 199 | Females not living alone: | 9 |
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