Population Demographics for Jefferson County, Illinois in 2020, 2019
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| Total population in Jefferson County | | | Total Population: | 38,827 | | Male Population: | 19,945 | | Female Population: | 18,882 |
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| Median age in Jefferson County | | | Both sexes | 40 | | Male | 39 | | Female | 42 |
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| Population in households in Jefferson County | | | Total Population: | 36,624 | | Male Population: | 17,974 | | Under 5 years: | 1,260 | | 5 to 9 years: | 1,173 | | 10 to 14 years: | 1,250 | | 15 to 17 years: | 757 | | 18 and 19 years: | 516 | | 20 years: | 239 | | 21 years: | 168 | | 22 to 24 years: | 571 | | 25 to 29 years: | 1,034 | | 30 to 34 years: | 1,058 | | 35 to 39 years: | 1,067 | | 40 to 44 years: | 1,165 | | 45 to 49 years: | 1,270 | | 50 to 54 years: | 1,335 | | 55 to 59 years: | 1,278 | | 60 and 61 years: | 524 | | 62 to 64 years: | 671 | | 65 and 66 years: | 376 | | 67 to 69 years: | 547 | | 70 to 74 years: | 654 | | 75 to 79 years: | 451 | | 80 to 84 years: | 337 | | 85 years and over: | 273 | | Female Population: | 18,650 | | Under 5 years: | 1,173 | | 5 to 9 years: | 1,132 | | 10 to 14 years: | 1,119 | | 15 to 17 years: | 719 | | 18 and 19 years: | 495 | | 20 years: | 206 | | 21 years: | 200 | | 22 to 24 years: | 619 | | 25 to 29 years: | 1,090 | | 30 to 34 years: | 1,024 | | 35 to 39 years: | 1,079 | | 40 to 44 years: | 1,158 | | 45 to 49 years: | 1,329 | | 50 to 54 years: | 1,374 | | 55 to 59 years: | 1,405 | | 60 and 61 years: | 470 | | 62 to 64 years: | 699 | | 65 and 66 years: | 396 | | 67 to 69 years: | 571 | | 70 to 74 years: | 744 | | 75 to 79 years: | 587 | | 80 to 84 years: | 485 | | 85 years and over: | 576 |
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| Average household size in Jefferson County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Jefferson County | | | Total: | 15,365 | | Family led homes: | 10,140 | | Husband-wife family: | 7,690 | | Other family: | 2,450 | | Population of male led with no wife present: | 696 | | Population female led with no husband present: | 1,754 | | Population of Nonfamily homes: | 5,225 | | Population living alone: | 4,477 | | Population not living alone: | 748 |
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| Total occupied homes in Jefferson County with people under 18 years old: | | | Total: | 15,365 | | Population of homes with one or more people under 18 years: | 4,628 | | Population of family homes: | 4,551 | | Husband-wife family: | 2,837 | | Under 6 years only: | 652 | | Under 6 years and 6 to 17 years: | 607 | | 6 to 17 years only: | 1,578 | | Other family: | 1,714 | | Male householder, no wife present: | 457 | | Under 6 years only: | 139 | | Under 6 years and 6 to 17 years: | 76 | | 6 to 17 years only: | 242 | | Female led with no husband present: | 1,257 | | Under 6 years only: | 326 | | Under 6 years and 6 to 17 years: | 246 | | 6 to 17 years only: | 685 | | Nonfamily households: | 77 | | Male led households: | 60 | | Under 6 years only: | 17 | | Under 6 years and 6 to 17 years: | 8 | | 6 to 17 years only: | 35 | | Female led householder: | 17 | | Under 6 years only: | 7 | | Under 6 years and 6 to 17 years: | 1 | | 6 to 17 years only: | 9 | | Households with no people under 18 years: | 10,737 | | Family households: | 5,589 | | Husband-wife family: | 4,853 | | Other family: | 736 | | Male led with no wife present: | 239 | | Female led with no husband present: | 497 | | Nonfamily households: | 5,148 | | Male led householder: | 2,394 | | Female led householder: | 2,754 |
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| Total number led homes in Jefferson County, by type | | | Total Home Population: | 15,365 | | Population of Family homes: | 10,140 | | Population of 15 to 24 year olds: | 384 | | Population of 25 to 34 year olds: | 1,530 | | Population of 35 to 44 year olds: | 1,892 | | Population of 45 to 54 year olds: | 2,165 | | Population of 55 to 59 year olds: | 1,046 | | Population of 60 to 64 year olds: | 965 | | Population of 65 to 74 year olds: | 1,322 | | Population of 75 to 84 year olds: | 665 | | Population of 85 year olds and over: | 171 | | Population of Nonfamily Homes: | 5,225 | | Population of 15 to 24 year olds: | 270 | | Population of 25 to 34 year olds: | 523 | | Population of 35 to 44 year olds: | 534 | | Population of 45 to 54 year olds: | 843 | | Population of 55 to 59 year olds: | 503 | | Population of 60 to 64 year olds: | 464 | | Population of 65 to 74 year olds: | 820 | | Population of 75 to 84 year olds: | 710 | | Population of 85 year olds and over: | 558 |
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| households in Jefferson County containing people over 60 | | | Total Population: | 15,365 | | Population of homes with one or more people 60 years and over: | 5,975 | | 1-person household: | 2,405 | | 2-or-more-person household: | 3,570 | | Family households: | 3,400 | | Nonfamily households: | 170 | | Population of homes with no people 60 years and over: | 9,390 | | 1-person household: | 2,072 | | 2-or-more-person household: | 7,318 | | Family homes: | 6,740 | | Nonfamily homes: | 578 |
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| homes in Jefferson County with multiple generations. | | | Total Population: | 15,365 | | Home has three or more generations: | 422 | | Home does not have three or more generations: | 14,943 |
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| Unmarried population in Jefferson County under 18 years old in homes | | | Total Population: | 8,578 | | Unmarried partner of home lead present: | 965 | | In family homes: | 889 | | Population of male led and male partner homes: | 17 | | Population of male led and female partner households: | 396 | | Population of female led and female partner households: | 49 | | Population of female led and male partner households: | 427 | | In nonfamily homes: | 76 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 64 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 12 | | No unmarried partner of home lead present: | 7,613 | | In family homes: | 7,582 | | Population of husband-wife family homes: | 5,355 | | Population of male lead with no wife present, family homes: | 358 | | Population of female lead with no husband present, family homes: | 1,869 | | In nonfamily homes: | 31 |
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| Population in families living in Jefferson County | | | Total Population: | 29,598 | | Population Under 18 years: | 8,366 | | Population 18 years and over: | 21,232 |
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| How long in Jefferson County have lived in one place. | | | Total: | 15,365 | | Population of Owner occupied homes: | 11,192 | | Family home: | 8,204 | | Nonfamily homess: | 2,988 | | Male led home: | 1,456 | | Living alone: | 1,184 | | Not living alone: | 272 | | Female led home: | 1,532 | | Living alone: | 1,385 | | Not living alone: | 147 | | Population of Renter occupied homes: | 4,173 | | Family run homes: | 1,936 | | Husband-wife family: | 857 | | Other family: | 1,079 | | Male led with no wife present: | 250 | | Female led with no husband present: | 829 | | Nonfamily Homes: | 2,237 | | Male led homes: | 998 | | Male living alone: | 806 | | Male not living alone: | 192 | | Female led homes: | 1,239 | | Females living alone: | 1,102 | | Females not living alone: | 137 |
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