Population Demographics for Lake St Louis, Missouri in 2020, 2019
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| Total population in Lake St Louis | | | Total Population: | 14,545 | | Male Population: | 7,202 | | Female Population: | 7,343 |
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| Median age in Lake St Louis | | | Both sexes | 41 | | Male | 40 | | Female | 42 |
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| Population in households in Lake St Louis | | | Total Population: | 14,545 | | Male Population: | 7,202 | | Under 5 years: | 422 | | 5 to 9 years: | 502 | | 10 to 14 years: | 535 | | 15 to 17 years: | 311 | | 18 and 19 years: | 166 | | 20 years: | 77 | | 21 years: | 70 | | 22 to 24 years: | 220 | | 25 to 29 years: | 419 | | 30 to 34 years: | 390 | | 35 to 39 years: | 472 | | 40 to 44 years: | 511 | | 45 to 49 years: | 544 | | 50 to 54 years: | 534 | | 55 to 59 years: | 498 | | 60 and 61 years: | 154 | | 62 to 64 years: | 288 | | 65 and 66 years: | 165 | | 67 to 69 years: | 238 | | 70 to 74 years: | 294 | | 75 to 79 years: | 193 | | 80 to 84 years: | 140 | | 85 years and over: | 59 | | Female Population: | 7,343 | | Under 5 years: | 415 | | 5 to 9 years: | 446 | | 10 to 14 years: | 503 | | 15 to 17 years: | 270 | | 18 and 19 years: | 147 | | 20 years: | 58 | | 21 years: | 67 | | 22 to 24 years: | 231 | | 25 to 29 years: | 404 | | 30 to 34 years: | 415 | | 35 to 39 years: | 459 | | 40 to 44 years: | 501 | | 45 to 49 years: | 601 | | 50 to 54 years: | 558 | | 55 to 59 years: | 515 | | 60 and 61 years: | 220 | | 62 to 64 years: | 299 | | 65 and 66 years: | 162 | | 67 to 69 years: | 232 | | 70 to 74 years: | 354 | | 75 to 79 years: | 221 | | 80 to 84 years: | 182 | | 85 years and over: | 83 |
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| Average household size in Lake St Louis | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Lake St Louis | | | Total: | 5,816 | | Family led homes: | 4,213 | | Husband-wife family: | 3,539 | | Other family: | 674 | | Population of male led with no wife present: | 221 | | Population female led with no husband present: | 453 | | Population of Nonfamily homes: | 1,603 | | Population living alone: | 1,293 | | Population not living alone: | 310 |
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| Total occupied homes in Lake St Louis with people under 18 years old: | | | Total: | 5,816 | | Population of homes with one or more people under 18 years: | 1,834 | | Population of family homes: | 1,814 | | Husband-wife family: | 1,376 | | Under 6 years only: | 316 | | Under 6 years and 6 to 17 years: | 291 | | 6 to 17 years only: | 769 | | Other family: | 438 | | Male householder, no wife present: | 135 | | Under 6 years only: | 28 | | Under 6 years and 6 to 17 years: | 19 | | 6 to 17 years only: | 88 | | Female led with no husband present: | 303 | | Under 6 years only: | 59 | | Under 6 years and 6 to 17 years: | 49 | | 6 to 17 years only: | 195 | | Nonfamily households: | 20 | | Male led households: | 13 | | Under 6 years only: | 3 | | Under 6 years and 6 to 17 years: | 1 | | 6 to 17 years only: | 9 | | Female led householder: | 7 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 2 | | 6 to 17 years only: | 5 | | Households with no people under 18 years: | 3,982 | | Family households: | 2,399 | | Husband-wife family: | 2,163 | | Other family: | 236 | | Male led with no wife present: | 86 | | Female led with no husband present: | 150 | | Nonfamily households: | 1,583 | | Male led householder: | 733 | | Female led householder: | 850 |
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| Total number led homes in Lake St Louis, by type | | | Total Home Population: | 5,816 | | Population of Family homes: | 4,213 | | Population of 15 to 24 year olds: | 71 | | Population of 25 to 34 year olds: | 479 | | Population of 35 to 44 year olds: | 859 | | Population of 45 to 54 year olds: | 977 | | Population of 55 to 59 year olds: | 432 | | Population of 60 to 64 year olds: | 414 | | Population of 65 to 74 year olds: | 627 | | Population of 75 to 84 year olds: | 299 | | Population of 85 year olds and over: | 55 | | Population of Nonfamily Homes: | 1,603 | | Population of 15 to 24 year olds: | 120 | | Population of 25 to 34 year olds: | 288 | | Population of 35 to 44 year olds: | 205 | | Population of 45 to 54 year olds: | 261 | | Population of 55 to 59 year olds: | 129 | | Population of 60 to 64 year olds: | 139 | | Population of 65 to 74 year olds: | 234 | | Population of 75 to 84 year olds: | 189 | | Population of 85 year olds and over: | 38 |
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| households in Lake St Louis containing people over 60 | | | Total Population: | 5,816 | | Population of homes with one or more people 60 years and over: | 2,125 | | 1-person household: | 552 | | 2-or-more-person household: | 1,573 | | Family households: | 1,519 | | Nonfamily households: | 54 | | Population of homes with no people 60 years and over: | 3,691 | | 1-person household: | 741 | | 2-or-more-person household: | 2,950 | | Family homes: | 2,694 | | Nonfamily homes: | 256 |
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| homes in Lake St Louis with multiple generations. | | | Total Population: | 5,816 | | Home has three or more generations: | 139 | | Home does not have three or more generations: | 5,677 |
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| Unmarried population in Lake St Louis under 18 years old in homes | | | Total Population: | 3,403 | | Unmarried partner of home lead present: | 183 | | In family homes: | 166 | | Population of male led and male partner homes: | 6 | | Population of male led and female partner households: | 71 | | Population of female led and female partner households: | 10 | | Population of female led and male partner households: | 79 | | In nonfamily homes: | 17 | | 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: | 4 | | No unmarried partner of home lead present: | 3,220 | | In family homes: | 3,207 | | Population of husband-wife family homes: | 2,664 | | Population of male lead with no wife present, family homes: | 135 | | Population of female lead with no husband present, family homes: | 408 | | In nonfamily homes: | 13 |
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| Population in families living in Lake St Louis | | | Total Population: | 12,370 | | Population Under 18 years: | 3,352 | | Population 18 years and over: | 9,018 |
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| How long in Lake St Louis have lived in one place. | | | Total: | 5,816 | | Population of Owner occupied homes: | 4,543 | | Family home: | 3,558 | | Nonfamily homess: | 985 | | Male led home: | 404 | | Living alone: | 290 | | Not living alone: | 114 | | Female led home: | 581 | | Living alone: | 518 | | Not living alone: | 63 | | Population of Renter occupied homes: | 1,273 | | Family run homes: | 655 | | Husband-wife family: | 358 | | Other family: | 297 | | Male led with no wife present: | 101 | | Female led with no husband present: | 196 | | Nonfamily Homes: | 618 | | Male led homes: | 342 | | Male living alone: | 260 | | Male not living alone: | 82 | | Female led homes: | 276 | | Females living alone: | 225 | | Females not living alone: | 51 |
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