Population Demographics for Jefferson County, Iowa in 2020, 2019
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| Total population in Jefferson County | | | Total Population: | 16,843 | | Male Population: | 8,997 | | Female Population: | 7,846 |
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| Median age in Jefferson County | | | Both sexes | 44 | | Male | 39 | | Female | 48 |
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| Population in households in Jefferson County | | | Total Population: | 15,112 | | Male Population: | 7,562 | | Under 5 years: | 405 | | 5 to 9 years: | 413 | | 10 to 14 years: | 464 | | 15 to 17 years: | 304 | | 18 and 19 years: | 168 | | 20 years: | 62 | | 21 years: | 83 | | 22 to 24 years: | 245 | | 25 to 29 years: | 430 | | 30 to 34 years: | 410 | | 35 to 39 years: | 386 | | 40 to 44 years: | 389 | | 45 to 49 years: | 498 | | 50 to 54 years: | 627 | | 55 to 59 years: | 888 | | 60 and 61 years: | 343 | | 62 to 64 years: | 420 | | 65 and 66 years: | 156 | | 67 to 69 years: | 194 | | 70 to 74 years: | 245 | | 75 to 79 years: | 167 | | 80 to 84 years: | 142 | | 85 years and over: | 123 | | Female Population: | 7,550 | | Under 5 years: | 357 | | 5 to 9 years: | 392 | | 10 to 14 years: | 423 | | 15 to 17 years: | 296 | | 18 and 19 years: | 134 | | 20 years: | 69 | | 21 years: | 80 | | 22 to 24 years: | 204 | | 25 to 29 years: | 400 | | 30 to 34 years: | 377 | | 35 to 39 years: | 395 | | 40 to 44 years: | 400 | | 45 to 49 years: | 545 | | 50 to 54 years: | 632 | | 55 to 59 years: | 802 | | 60 and 61 years: | 342 | | 62 to 64 years: | 388 | | 65 and 66 years: | 199 | | 67 to 69 years: | 198 | | 70 to 74 years: | 249 | | 75 to 79 years: | 239 | | 80 to 84 years: | 203 | | 85 years and over: | 226 |
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| Average household size in Jefferson County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 2 |
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| Number of occupied homes in Jefferson County | | | Total: | 6,846 | | Family led homes: | 4,080 | | Husband-wife family: | 3,271 | | Other family: | 809 | | Population of male led with no wife present: | 248 | | Population female led with no husband present: | 561 | | Population of Nonfamily homes: | 2,766 | | Population living alone: | 2,321 | | Population not living alone: | 445 |
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| Total occupied homes in Jefferson County with people under 18 years old: | | | Total: | 6,846 | | Population of homes with one or more people under 18 years: | 1,669 | | Population of family homes: | 1,645 | | Husband-wife family: | 1,123 | | Under 6 years only: | 219 | | Under 6 years and 6 to 17 years: | 246 | | 6 to 17 years only: | 658 | | Other family: | 522 | | Male householder, no wife present: | 146 | | Under 6 years only: | 48 | | Under 6 years and 6 to 17 years: | 25 | | 6 to 17 years only: | 73 | | Female led with no husband present: | 376 | | Under 6 years only: | 90 | | Under 6 years and 6 to 17 years: | 55 | | 6 to 17 years only: | 231 | | Nonfamily households: | 24 | | Male led households: | 18 | | Under 6 years only: | 3 | | Under 6 years and 6 to 17 years: | 3 | | 6 to 17 years only: | 12 | | Female led householder: | 6 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 6 | | Households with no people under 18 years: | 5,177 | | Family households: | 2,435 | | Husband-wife family: | 2,148 | | Other family: | 287 | | Male led with no wife present: | 102 | | Female led with no husband present: | 185 | | Nonfamily households: | 2,742 | | Male led householder: | 1,356 | | Female led householder: | 1,386 |
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| Total number led homes in Jefferson County, by type | | | Total Home Population: | 6,846 | | Population of Family homes: | 4,080 | | Population of 15 to 24 year olds: | 116 | | Population of 25 to 34 year olds: | 504 | | Population of 35 to 44 year olds: | 653 | | Population of 45 to 54 year olds: | 891 | | Population of 55 to 59 year olds: | 603 | | Population of 60 to 64 year olds: | 529 | | Population of 65 to 74 year olds: | 440 | | Population of 75 to 84 year olds: | 253 | | Population of 85 year olds and over: | 91 | | Population of Nonfamily Homes: | 2,766 | | Population of 15 to 24 year olds: | 149 | | Population of 25 to 34 year olds: | 298 | | Population of 35 to 44 year olds: | 223 | | Population of 45 to 54 year olds: | 419 | | Population of 55 to 59 year olds: | 424 | | Population of 60 to 64 year olds: | 426 | | Population of 65 to 74 year olds: | 352 | | Population of 75 to 84 year olds: | 281 | | Population of 85 year olds and over: | 194 |
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| households in Jefferson County containing people over 60 | | | Total Population: | 6,846 | | Population of homes with one or more people 60 years and over: | 2,762 | | 1-person household: | 1,136 | | 2-or-more-person household: | 1,626 | | Family households: | 1,476 | | Nonfamily households: | 150 | | Population of homes with no people 60 years and over: | 4,084 | | 1-person household: | 1,185 | | 2-or-more-person household: | 2,899 | | Family homes: | 2,604 | | Nonfamily homes: | 295 |
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| homes in Jefferson County with multiple generations. | | | Total Population: | 6,846 | | Home has three or more generations: | 98 | | Home does not have three or more generations: | 6,748 |
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| Unmarried population in Jefferson County under 18 years old in homes | | | Total Population: | 3,050 | | Unmarried partner of home lead present: | 314 | | In family homes: | 293 | | Population of male led and male partner homes: | 7 | | Population of male led and female partner households: | 112 | | Population of female led and female partner households: | 12 | | Population of female led and male partner households: | 162 | | In nonfamily homes: | 21 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 21 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 0 | | No unmarried partner of home lead present: | 2,736 | | In family homes: | 2,727 | | Population of husband-wife family homes: | 2,157 | | Population of male lead with no wife present, family homes: | 121 | | Population of female lead with no husband present, family homes: | 449 | | In nonfamily homes: | 9 |
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| Population in families living in Jefferson County | | | Total Population: | 11,398 | | Population Under 18 years: | 2,980 | | Population 18 years and over: | 8,418 |
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| How long in Jefferson County have lived in one place. | | | Total: | 6,846 | | Population of Owner occupied homes: | 4,573 | | Family home: | 3,179 | | Nonfamily homess: | 1,394 | | Male led home: | 678 | | Living alone: | 557 | | Not living alone: | 121 | | Female led home: | 716 | | Living alone: | 616 | | Not living alone: | 100 | | Population of Renter occupied homes: | 2,273 | | Family run homes: | 901 | | Husband-wife family: | 558 | | Other family: | 343 | | Male led with no wife present: | 87 | | Female led with no husband present: | 256 | | Nonfamily Homes: | 1,372 | | Male led homes: | 696 | | Male living alone: | 560 | | Male not living alone: | 136 | | Female led homes: | 676 | | Females living alone: | 588 | | Females not living alone: | 88 |
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