Population Demographics for O'fallon, Missouri in 2020, 2019
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| | Male | Female | Total | | Total Population | 38,742 | 40,587 | 79,329 | | White | 34,785 | 36,530 | 71,315 | | Black or African American | 1,583 | 1,581 | 3,164 | | Asian | 1,184 | 1,315 | 2,499 | | Hispanic or Latino | 1,069 | 1,090 | 2,159 | | Two or More Races | 707 | 745 | 1,452 | | Some Other Race | 362 | 296 | 658 | | American Indian | 98 | 99 | 197 |
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| Total population in O'fallon | | | Total Population: | 79,329 | | Male Population: | 38,742 | | Female Population: | 40,587 |
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| Median age in O'fallon | | | Both sexes | 34 | | Male | 33 | | Female | 35 |
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| Population in households in O'fallon | | | Total Population: | 79,035 | | Male Population: | 38,656 | | Under 5 years: | 3,237 | | 5 to 9 years: | 3,624 | | 10 to 14 years: | 3,374 | | 15 to 17 years: | 1,876 | | 18 and 19 years: | 899 | | 20 years: | 393 | | 21 years: | 404 | | 22 to 24 years: | 1,112 | | 25 to 29 years: | 2,415 | | 30 to 34 years: | 2,914 | | 35 to 39 years: | 3,328 | | 40 to 44 years: | 3,173 | | 45 to 49 years: | 3,197 | | 50 to 54 years: | 2,620 | | 55 to 59 years: | 1,764 | | 60 and 61 years: | 604 | | 62 to 64 years: | 806 | | 65 and 66 years: | 456 | | 67 to 69 years: | 577 | | 70 to 74 years: | 735 | | 75 to 79 years: | 584 | | 80 to 84 years: | 344 | | 85 years and over: | 220 | | Female Population: | 40,379 | | Under 5 years: | 3,109 | | 5 to 9 years: | 3,500 | | 10 to 14 years: | 3,266 | | 15 to 17 years: | 1,792 | | 18 and 19 years: | 916 | | 20 years: | 365 | | 21 years: | 335 | | 22 to 24 years: | 1,194 | | 25 to 29 years: | 2,714 | | 30 to 34 years: | 3,071 | | 35 to 39 years: | 3,504 | | 40 to 44 years: | 3,361 | | 45 to 49 years: | 3,210 | | 50 to 54 years: | 2,663 | | 55 to 59 years: | 1,909 | | 60 and 61 years: | 643 | | 62 to 64 years: | 912 | | 65 and 66 years: | 494 | | 67 to 69 years: | 710 | | 70 to 74 years: | 940 | | 75 to 79 years: | 771 | | 80 to 84 years: | 513 | | 85 years and over: | 487 |
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| Average household size in O'fallon | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in O'fallon | | | Total: | 28,234 | | Family led homes: | 21,436 | | Husband-wife family: | 17,401 | | Other family: | 4,035 | | Population of male led with no wife present: | 1,206 | | Population female led with no husband present: | 2,829 | | Population of Nonfamily homes: | 6,798 | | Population living alone: | 5,445 | | Population not living alone: | 1,353 |
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| Total occupied homes in O'fallon with people under 18 years old: | | | Total: | 28,234 | | Population of homes with one or more people under 18 years: | 12,623 | | Population of family homes: | 12,517 | | Husband-wife family: | 9,751 | | Under 6 years only: | 2,417 | | Under 6 years and 6 to 17 years: | 2,233 | | 6 to 17 years only: | 5,101 | | Other family: | 2,766 | | Male householder, no wife present: | 780 | | Under 6 years only: | 211 | | Under 6 years and 6 to 17 years: | 128 | | 6 to 17 years only: | 441 | | Female led with no husband present: | 1,986 | | Under 6 years only: | 395 | | Under 6 years and 6 to 17 years: | 297 | | 6 to 17 years only: | 1,294 | | Nonfamily households: | 106 | | Male led households: | 77 | | Under 6 years only: | 16 | | Under 6 years and 6 to 17 years: | 8 | | 6 to 17 years only: | 53 | | Female led householder: | 29 | | Under 6 years only: | 5 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 24 | | Households with no people under 18 years: | 15,611 | | Family households: | 8,919 | | Husband-wife family: | 7,650 | | Other family: | 1,269 | | Male led with no wife present: | 426 | | Female led with no husband present: | 843 | | Nonfamily households: | 6,692 | | Male led householder: | 2,979 | | Female led householder: | 3,713 |
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| Total number led homes in O'fallon, by type | | | Total Home Population: | 28,234 | | Population of Family homes: | 21,436 | | Population of 15 to 24 year olds: | 343 | | Population of 25 to 34 year olds: | 3,917 | | Population of 35 to 44 year olds: | 6,303 | | Population of 45 to 54 year olds: | 5,485 | | Population of 55 to 59 year olds: | 1,575 | | Population of 60 to 64 year olds: | 1,268 | | Population of 65 to 74 year olds: | 1,619 | | Population of 75 to 84 year olds: | 781 | | Population of 85 year olds and over: | 145 | | Population of Nonfamily Homes: | 6,798 | | Population of 15 to 24 year olds: | 441 | | Population of 25 to 34 year olds: | 1,330 | | Population of 35 to 44 year olds: | 898 | | Population of 45 to 54 year olds: | 1,267 | | Population of 55 to 59 year olds: | 536 | | Population of 60 to 64 year olds: | 478 | | Population of 65 to 74 year olds: | 785 | | Population of 75 to 84 year olds: | 716 | | Population of 85 year olds and over: | 347 |
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| households in O'fallon containing people over 60 | | | Total Population: | 28,234 | | Population of homes with one or more people 60 years and over: | 6,808 | | 1-person household: | 2,186 | | 2-or-more-person household: | 4,622 | | Family households: | 4,448 | | Nonfamily households: | 174 | | Population of homes with no people 60 years and over: | 21,426 | | 1-person household: | 3,259 | | 2-or-more-person household: | 18,167 | | Family homes: | 16,988 | | Nonfamily homes: | 1,179 |
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| homes in O'fallon with multiple generations. | | | Total Population: | 28,234 | | Home has three or more generations: | 828 | | Home does not have three or more generations: | 27,406 |
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| Unmarried population in O'fallon under 18 years old in homes | | | Total Population: | 23,770 | | Unmarried partner of home lead present: | 1,222 | | In family homes: | 1,112 | | Population of male led and male partner homes: | 28 | | Population of male led and female partner households: | 475 | | Population of female led and female partner households: | 69 | | Population of female led and male partner households: | 540 | | In nonfamily homes: | 110 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 91 | | Population of female led and female partner homes: | 5 | | Population of female led and male partner homes: | 14 | | No unmarried partner of home lead present: | 22,548 | | In family homes: | 22,516 | | Population of husband-wife family homes: | 18,974 | | Population of male lead with no wife present, family homes: | 788 | | Population of female lead with no husband present, family homes: | 2,754 | | In nonfamily homes: | 32 |
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| Population in families living in O'fallon | | | Total Population: | 69,284 | | Population Under 18 years: | 23,488 | | Population 18 years and over: | 45,796 |
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| How long in O'fallon have lived in one place. | | | Total: | 28,234 | | Population of Owner occupied homes: | 23,375 | | Family home: | 18,846 | | Nonfamily homess: | 4,529 | | Male led home: | 2,032 | | Living alone: | 1,514 | | Not living alone: | 518 | | Female led home: | 2,497 | | Living alone: | 2,139 | | Not living alone: | 358 | | Population of Renter occupied homes: | 4,859 | | Family run homes: | 2,590 | | Husband-wife family: | 1,305 | | Other family: | 1,285 | | Male led with no wife present: | 340 | | Female led with no husband present: | 945 | | Nonfamily Homes: | 2,269 | | Male led homes: | 1,024 | | Male living alone: | 732 | | Male not living alone: | 292 | | Female led homes: | 1,245 | | Females living alone: | 1,060 | | Females not living alone: | 185 |
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