Population Demographics for Jefferson County, Kansas in 2020, 2019
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| Total population in Jefferson County | | | Total Population: | 19,126 | | Male Population: | 9,698 | | Female Population: | 9,428 |
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| Median age in Jefferson County | | | Both sexes | 43 | | Male | 42 | | Female | 43 |
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| Population in households in Jefferson County | | | Total Population: | 18,891 | | Male Population: | 9,579 | | Under 5 years: | 588 | | 5 to 9 years: | 689 | | 10 to 14 years: | 769 | | 15 to 17 years: | 460 | | 18 and 19 years: | 219 | | 20 years: | 92 | | 21 years: | 77 | | 22 to 24 years: | 241 | | 25 to 29 years: | 461 | | 30 to 34 years: | 480 | | 35 to 39 years: | 515 | | 40 to 44 years: | 641 | | 45 to 49 years: | 845 | | 50 to 54 years: | 803 | | 55 to 59 years: | 738 | | 60 and 61 years: | 242 | | 62 to 64 years: | 367 | | 65 and 66 years: | 197 | | 67 to 69 years: | 280 | | 70 to 74 years: | 351 | | 75 to 79 years: | 256 | | 80 to 84 years: | 162 | | 85 years and over: | 106 | | Female Population: | 9,312 | | Under 5 years: | 509 | | 5 to 9 years: | 586 | | 10 to 14 years: | 679 | | 15 to 17 years: | 442 | | 18 and 19 years: | 192 | | 20 years: | 68 | | 21 years: | 83 | | 22 to 24 years: | 239 | | 25 to 29 years: | 462 | | 30 to 34 years: | 452 | | 35 to 39 years: | 557 | | 40 to 44 years: | 662 | | 45 to 49 years: | 844 | | 50 to 54 years: | 810 | | 55 to 59 years: | 683 | | 60 and 61 years: | 252 | | 62 to 64 years: | 333 | | 65 and 66 years: | 208 | | 67 to 69 years: | 265 | | 70 to 74 years: | 362 | | 75 to 79 years: | 252 | | 80 to 84 years: | 193 | | 85 years and over: | 179 |
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| Average household size in Jefferson County | | | Total: | 3 | | Under 18 years: | 1 | | 18 years and over: | 2 |
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| Number of occupied homes in Jefferson County | | | Total: | 7,366 | | Family led homes: | 5,440 | | Husband-wife family: | 4,475 | | Other family: | 965 | | Population of male led with no wife present: | 378 | | Population female led with no husband present: | 587 | | Population of Nonfamily homes: | 1,926 | | Population living alone: | 1,592 | | Population not living alone: | 334 |
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| Total occupied homes in Jefferson County with people under 18 years old: | | | Total: | 7,366 | | Population of homes with one or more people under 18 years: | 2,474 | | Population of family homes: | 2,446 | | Husband-wife family: | 1,776 | | Under 6 years only: | 348 | | Under 6 years and 6 to 17 years: | 381 | | 6 to 17 years only: | 1,047 | | Other family: | 670 | | Male householder, no wife present: | 262 | | Under 6 years only: | 53 | | Under 6 years and 6 to 17 years: | 34 | | 6 to 17 years only: | 175 | | Female led with no husband present: | 408 | | Under 6 years only: | 62 | | Under 6 years and 6 to 17 years: | 73 | | 6 to 17 years only: | 273 | | Nonfamily households: | 28 | | Male led households: | 23 | | Under 6 years only: | 5 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 18 | | Female led householder: | 5 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 5 | | Households with no people under 18 years: | 4,892 | | Family households: | 2,994 | | Husband-wife family: | 2,699 | | Other family: | 295 | | Male led with no wife present: | 116 | | Female led with no husband present: | 179 | | Nonfamily households: | 1,898 | | Male led householder: | 988 | | Female led householder: | 910 |
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| Total number led homes in Jefferson County, by type | | | Total Home Population: | 7,366 | | Population of Family homes: | 5,440 | | Population of 15 to 24 year olds: | 99 | | Population of 25 to 34 year olds: | 662 | | Population of 35 to 44 year olds: | 1,061 | | Population of 45 to 54 year olds: | 1,419 | | Population of 55 to 59 year olds: | 584 | | Population of 60 to 64 year olds: | 499 | | Population of 65 to 74 year olds: | 699 | | Population of 75 to 84 year olds: | 344 | | Population of 85 year olds and over: | 73 | | Population of Nonfamily Homes: | 1,926 | | Population of 15 to 24 year olds: | 72 | | Population of 25 to 34 year olds: | 155 | | Population of 35 to 44 year olds: | 141 | | Population of 45 to 54 year olds: | 402 | | Population of 55 to 59 year olds: | 230 | | Population of 60 to 64 year olds: | 188 | | Population of 65 to 74 year olds: | 328 | | Population of 75 to 84 year olds: | 268 | | Population of 85 year olds and over: | 142 |
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| households in Jefferson County containing people over 60 | | | Total Population: | 7,366 | | Population of homes with one or more people 60 years and over: | 2,733 | | 1-person household: | 855 | | 2-or-more-person household: | 1,878 | | Family households: | 1,798 | | Nonfamily households: | 80 | | Population of homes with no people 60 years and over: | 4,633 | | 1-person household: | 737 | | 2-or-more-person household: | 3,896 | | Family homes: | 3,642 | | Nonfamily homes: | 254 |
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| homes in Jefferson County with multiple generations. | | | Total Population: | 7,366 | | Home has three or more generations: | 232 | | Home does not have three or more generations: | 7,134 |
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| Unmarried population in Jefferson County under 18 years old in homes | | | Total Population: | 4,721 | | Unmarried partner of home lead present: | 356 | | In family homes: | 334 | | Population of male led and male partner homes: | 10 | | Population of male led and female partner households: | 180 | | Population of female led and female partner households: | 10 | | Population of female led and male partner households: | 134 | | In nonfamily homes: | 22 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 20 | | Population of female led and female partner homes: | 1 | | Population of female led and male partner homes: | 1 | | No unmarried partner of home lead present: | 4,365 | | In family homes: | 4,351 | | Population of husband-wife family homes: | 3,510 | | Population of male lead with no wife present, family homes: | 257 | | Population of female lead with no husband present, family homes: | 584 | | In nonfamily homes: | 14 |
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| Population in families living in Jefferson County | | | Total Population: | 16,170 | | Population Under 18 years: | 4,599 | | Population 18 years and over: | 11,571 |
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| How long in Jefferson County have lived in one place. | | | Total: | 7,366 | | Population of Owner occupied homes: | 6,194 | | Family home: | 4,770 | | Nonfamily homess: | 1,424 | | Male led home: | 765 | | Living alone: | 601 | | Not living alone: | 164 | | Female led home: | 659 | | Living alone: | 572 | | Not living alone: | 87 | | Population of Renter occupied homes: | 1,172 | | Family run homes: | 670 | | Husband-wife family: | 391 | | Other family: | 279 | | Male led with no wife present: | 98 | | Female led with no husband present: | 181 | | Nonfamily Homes: | 502 | | Male led homes: | 246 | | Male living alone: | 198 | | Male not living alone: | 48 | | Female led homes: | 256 | | Females living alone: | 221 | | Females not living alone: | 35 |
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