Population Demographics for Jefferson County, Tennessee in 2020, 2019
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| Total population in Jefferson County | | | Total Population: | 51,407 | | Male Population: | 25,245 | | Female Population: | 26,162 |
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| Median age in Jefferson County | | | Both sexes | 40 | | Male | 39 | | Female | 41 |
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| Population in households in Jefferson County | | | Total Population: | 49,813 | | Male Population: | 24,433 | | Under 5 years: | 1,525 | | 5 to 9 years: | 1,503 | | 10 to 14 years: | 1,686 | | 15 to 17 years: | 1,031 | | 18 and 19 years: | 630 | | 20 years: | 281 | | 21 years: | 294 | | 22 to 24 years: | 804 | | 25 to 29 years: | 1,302 | | 30 to 34 years: | 1,310 | | 35 to 39 years: | 1,612 | | 40 to 44 years: | 1,698 | | 45 to 49 years: | 1,898 | | 50 to 54 years: | 1,806 | | 55 to 59 years: | 1,597 | | 60 and 61 years: | 609 | | 62 to 64 years: | 1,017 | | 65 and 66 years: | 624 | | 67 to 69 years: | 887 | | 70 to 74 years: | 1,080 | | 75 to 79 years: | 688 | | 80 to 84 years: | 366 | | 85 years and over: | 185 | | Female Population: | 25,380 | | Under 5 years: | 1,432 | | 5 to 9 years: | 1,520 | | 10 to 14 years: | 1,608 | | 15 to 17 years: | 971 | | 18 and 19 years: | 553 | | 20 years: | 332 | | 21 years: | 347 | | 22 to 24 years: | 832 | | 25 to 29 years: | 1,274 | | 30 to 34 years: | 1,349 | | 35 to 39 years: | 1,667 | | 40 to 44 years: | 1,795 | | 45 to 49 years: | 1,972 | | 50 to 54 years: | 1,861 | | 55 to 59 years: | 1,729 | | 60 and 61 years: | 740 | | 62 to 64 years: | 1,129 | | 65 and 66 years: | 643 | | 67 to 69 years: | 873 | | 70 to 74 years: | 1,104 | | 75 to 79 years: | 785 | | 80 to 84 years: | 481 | | 85 years and over: | 383 |
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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: | 19,864 | | Family led homes: | 14,305 | | Husband-wife family: | 11,078 | | Other family: | 3,227 | | Population of male led with no wife present: | 1,035 | | Population female led with no husband present: | 2,192 | | Population of Nonfamily homes: | 5,559 | | Population living alone: | 4,596 | | Population not living alone: | 963 |
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| Total occupied homes in Jefferson County with people under 18 years old: | | | Total: | 19,864 | | Population of homes with one or more people under 18 years: | 6,306 | | Population of family homes: | 6,222 | | Husband-wife family: | 4,210 | | Under 6 years only: | 915 | | Under 6 years and 6 to 17 years: | 904 | | 6 to 17 years only: | 2,391 | | Other family: | 2,012 | | Male householder, no wife present: | 614 | | Under 6 years only: | 168 | | Under 6 years and 6 to 17 years: | 97 | | 6 to 17 years only: | 349 | | Female led with no husband present: | 1,398 | | Under 6 years only: | 320 | | Under 6 years and 6 to 17 years: | 220 | | 6 to 17 years only: | 858 | | Nonfamily households: | 84 | | Male led households: | 61 | | Under 6 years only: | 17 | | Under 6 years and 6 to 17 years: | 8 | | 6 to 17 years only: | 36 | | Female led householder: | 23 | | Under 6 years only: | 6 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 17 | | Households with no people under 18 years: | 13,558 | | Family households: | 8,083 | | Husband-wife family: | 6,868 | | Other family: | 1,215 | | Male led with no wife present: | 421 | | Female led with no husband present: | 794 | | Nonfamily households: | 5,475 | | Male led householder: | 2,564 | | Female led householder: | 2,911 |
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| Total number led homes in Jefferson County, by type | | | Total Home Population: | 19,864 | | Population of Family homes: | 14,305 | | Population of 15 to 24 year olds: | 415 | | Population of 25 to 34 year olds: | 1,827 | | Population of 35 to 44 year olds: | 2,895 | | Population of 45 to 54 year olds: | 3,113 | | Population of 55 to 59 year olds: | 1,287 | | Population of 60 to 64 year olds: | 1,430 | | Population of 65 to 74 year olds: | 2,272 | | Population of 75 to 84 year olds: | 913 | | Population of 85 year olds and over: | 153 | | Population of Nonfamily Homes: | 5,559 | | Population of 15 to 24 year olds: | 337 | | Population of 25 to 34 year olds: | 430 | | Population of 35 to 44 year olds: | 575 | | Population of 45 to 54 year olds: | 1,061 | | Population of 55 to 59 year olds: | 555 | | Population of 60 to 64 year olds: | 571 | | Population of 65 to 74 year olds: | 1,037 | | Population of 75 to 84 year olds: | 723 | | Population of 85 year olds and over: | 270 |
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| households in Jefferson County containing people over 60 | | | Total Population: | 19,864 | | Population of homes with one or more people 60 years and over: | 8,008 | | 1-person household: | 2,405 | | 2-or-more-person household: | 5,603 | | Family households: | 5,368 | | Nonfamily households: | 235 | | Population of homes with no people 60 years and over: | 11,856 | | 1-person household: | 2,191 | | 2-or-more-person household: | 9,665 | | Family homes: | 8,937 | | Nonfamily homes: | 728 |
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| homes in Jefferson County with multiple generations. | | | Total Population: | 19,864 | | Home has three or more generations: | 829 | | Home does not have three or more generations: | 19,035 |
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| Unmarried population in Jefferson County under 18 years old in homes | | | Total Population: | 11,267 | | Unmarried partner of home lead present: | 1,023 | | In family homes: | 939 | | Population of male led and male partner homes: | 32 | | Population of male led and female partner households: | 426 | | Population of female led and female partner households: | 42 | | Population of female led and male partner households: | 439 | | In nonfamily homes: | 84 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 77 | | Population of female led and female partner homes: | 2 | | Population of female led and male partner homes: | 5 | | No unmarried partner of home lead present: | 10,244 | | In family homes: | 10,207 | | Population of husband-wife family homes: | 7,802 | | Population of male lead with no wife present, family homes: | 560 | | Population of female lead with no husband present, family homes: | 1,845 | | In nonfamily homes: | 37 |
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| Population in families living in Jefferson County | | | Total Population: | 41,784 | | Population Under 18 years: | 10,996 | | Population 18 years and over: | 30,788 |
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| How long in Jefferson County have lived in one place. | | | Total: | 19,864 | | Population of Owner occupied homes: | 14,973 | | Family home: | 11,304 | | Nonfamily homess: | 3,669 | | Male led home: | 1,643 | | Living alone: | 1,383 | | Not living alone: | 260 | | Female led home: | 2,026 | | Living alone: | 1,797 | | Not living alone: | 229 | | Population of Renter occupied homes: | 4,891 | | Family run homes: | 3,001 | | Husband-wife family: | 1,693 | | Other family: | 1,308 | | Male led with no wife present: | 381 | | Female led with no husband present: | 927 | | Nonfamily Homes: | 1,890 | | Male led homes: | 982 | | Male living alone: | 704 | | Male not living alone: | 278 | | Female led homes: | 908 | | Females living alone: | 712 | | Females not living alone: | 196 |
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