Population Demographics for Jefferson County, Kentucky in 2020, 2019
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| | Male | Female | Total | Total Population | 357,699 | 383,397 | 741,096 | White | 261,556 | 277,158 | 538,714 | Black or African American | 71,766 | 82,480 | 154,246 | Hispanic or Latino | 17,652 | 14,890 | 32,542 | Two or More Races | 8,042 | 8,613 | 16,655 | Asian | 7,890 | 8,448 | 16,338 | Some Other Race | 7,312 | 5,583 | 12,895 | American Indian | 900 | 888 | 1,788 | Three or more races | 544 | 695 | 1,239 | Native Hawaiian Pacific Islander | 233 | 227 | 460 | Native Hawaiian | 61 | 74 | 135 |
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| Total population in Jefferson County | | Total Population: | 741,096 | Male Population: | 357,699 | Female Population: | 383,397 |
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| Median age in Jefferson County | | Both sexes | 38 | Male | 36 | Female | 39 |
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| Population in households in Jefferson County | | Total Population: | 726,943 | Male Population: | 350,209 | Under 5 years: | 24,877 | 5 to 9 years: | 23,896 | 10 to 14 years: | 24,173 | 15 to 17 years: | 14,311 | 18 and 19 years: | 8,712 | 20 years: | 4,275 | 21 years: | 4,225 | 22 to 24 years: | 14,447 | 25 to 29 years: | 25,838 | 30 to 34 years: | 24,577 | 35 to 39 years: | 23,533 | 40 to 44 years: | 23,143 | 45 to 49 years: | 26,353 | 50 to 54 years: | 26,331 | 55 to 59 years: | 23,294 | 60 and 61 years: | 8,528 | 62 to 64 years: | 10,921 | 65 and 66 years: | 5,596 | 67 to 69 years: | 7,367 | 70 to 74 years: | 9,253 | 75 to 79 years: | 7,315 | 80 to 84 years: | 5,462 | 85 years and over: | 3,782 | Female Population: | 376,734 | Under 5 years: | 23,672 | 5 to 9 years: | 23,219 | 10 to 14 years: | 22,959 | 15 to 17 years: | 13,710 | 18 and 19 years: | 8,410 | 20 years: | 4,334 | 21 years: | 4,581 | 22 to 24 years: | 14,947 | 25 to 29 years: | 27,168 | 30 to 34 years: | 25,119 | 35 to 39 years: | 24,382 | 40 to 44 years: | 23,656 | 45 to 49 years: | 27,947 | 50 to 54 years: | 28,836 | 55 to 59 years: | 26,189 | 60 and 61 years: | 9,437 | 62 to 64 years: | 12,257 | 65 and 66 years: | 6,572 | 67 to 69 years: | 9,077 | 70 to 74 years: | 12,489 | 75 to 79 years: | 10,577 | 80 to 84 years: | 9,039 | 85 years and over: | 8,157 |
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| Average household size in Jefferson County | | Total: | 2 | Under 18 years: | 1 | 18 years and over: | 2 |
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| Number of occupied homes in Jefferson County | | Total: | 309,175 | Family led homes: | 188,982 | Husband-wife family: | 126,329 | Other family: | 62,653 | Population of male led with no wife present: | 15,037 | Population female led with no husband present: | 47,616 | Population of Nonfamily homes: | 120,193 | Population living alone: | 98,843 | Population not living alone: | 21,350 |
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| Total occupied homes in Jefferson County with people under 18 years old: | | Total: | 309,175 | Population of homes with one or more people under 18 years: | 93,125 | Population of family homes: | 92,062 | Husband-wife family: | 52,114 | Under 6 years only: | 13,173 | Under 6 years and 6 to 17 years: | 10,930 | 6 to 17 years only: | 28,011 | Other family: | 39,948 | Male householder, no wife present: | 8,494 | Under 6 years only: | 2,422 | Under 6 years and 6 to 17 years: | 1,402 | 6 to 17 years only: | 4,670 | Female led with no husband present: | 31,454 | Under 6 years only: | 7,499 | Under 6 years and 6 to 17 years: | 6,761 | 6 to 17 years only: | 17,194 | Nonfamily households: | 1,063 | Male led households: | 759 | Under 6 years only: | 206 | Under 6 years and 6 to 17 years: | 59 | 6 to 17 years only: | 494 | Female led householder: | 304 | Under 6 years only: | 84 | Under 6 years and 6 to 17 years: | 22 | 6 to 17 years only: | 198 | Households with no people under 18 years: | 216,050 | Family households: | 96,920 | Husband-wife family: | 74,215 | Other family: | 22,705 | Male led with no wife present: | 6,543 | Female led with no husband present: | 16,162 | Nonfamily households: | 119,130 | Male led householder: | 54,482 | Female led householder: | 64,648 |
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| Total number led homes in Jefferson County, by type | | Total Home Population: | 309,175 | Population of Family homes: | 188,982 | Population of 15 to 24 year olds: | 6,677 | Population of 25 to 34 year olds: | 32,489 | Population of 35 to 44 year olds: | 38,947 | Population of 45 to 54 year olds: | 42,627 | Population of 55 to 59 year olds: | 18,500 | Population of 60 to 64 year olds: | 15,621 | Population of 65 to 74 year olds: | 19,428 | Population of 75 to 84 year olds: | 11,516 | Population of 85 year olds and over: | 3,177 | Population of Nonfamily Homes: | 120,193 | Population of 15 to 24 year olds: | 8,940 | Population of 25 to 34 year olds: | 19,930 | Population of 35 to 44 year olds: | 14,384 | Population of 45 to 54 year olds: | 21,796 | Population of 55 to 59 year olds: | 11,947 | Population of 60 to 64 year olds: | 10,650 | Population of 65 to 74 year olds: | 14,078 | Population of 75 to 84 year olds: | 12,231 | Population of 85 year olds and over: | 6,237 |
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| households in Jefferson County containing people over 60 | | Total Population: | 309,175 | Population of homes with one or more people 60 years and over: | 100,614 | 1-person household: | 40,681 | 2-or-more-person household: | 59,933 | Family households: | 56,773 | Nonfamily households: | 3,160 | Population of homes with no people 60 years and over: | 208,561 | 1-person household: | 58,162 | 2-or-more-person household: | 150,399 | Family homes: | 132,209 | Nonfamily homes: | 18,190 |
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| homes in Jefferson County with multiple generations. | | Total Population: | 309,175 | Home has three or more generations: | 10,962 | Home does not have three or more generations: | 298,213 |
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| Unmarried population in Jefferson County under 18 years old in homes | | Total Population: | 170,690 | Unmarried partner of home lead present: | 16,121 | In family homes: | 15,264 | Population of male led and male partner homes: | 333 | Population of male led and female partner households: | 5,490 | Population of female led and female partner households: | 751 | Population of female led and male partner households: | 8,690 | In nonfamily homes: | 857 | Population of male led and male partner homes: | 8 | Population of male led and female partner homes: | 701 | Population of female led and female partner homes: | 43 | Population of female led and male partner homes: | 105 | No unmarried partner of home lead present: | 154,569 | In family homes: | 154,006 | Population of husband-wife family homes: | 97,524 | Population of male lead with no wife present, family homes: | 8,275 | Population of female lead with no husband present, family homes: | 48,207 | In nonfamily homes: | 563 |
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| Population in families living in Jefferson County | | Total Population: | 563,026 | Population Under 18 years: | 167,710 | Population 18 years and over: | 395,316 |
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| How long in Jefferson County have lived in one place. | | Total: | 309,175 | Population of Owner occupied homes: | 194,997 | Family home: | 134,766 | Nonfamily homess: | 60,231 | Male led home: | 24,676 | Living alone: | 19,627 | Not living alone: | 5,049 | Female led home: | 35,555 | Living alone: | 31,436 | Not living alone: | 4,119 | Population of Renter occupied homes: | 114,178 | Family run homes: | 54,216 | Husband-wife family: | 21,015 | Other family: | 33,201 | Male led with no wife present: | 7,013 | Female led with no husband present: | 26,188 | Nonfamily Homes: | 59,962 | Male led homes: | 30,565 | Male living alone: | 23,673 | Male not living alone: | 6,892 | Female led homes: | 29,397 | Females living alone: | 24,107 | Females not living alone: | 5,290 |
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