Population Demographics for Jefferson County, Idaho in 2020, 2019
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| | Male | Female | Total | | Total Population | 13,114 | 13,026 | 26,140 | | White | 11,882 | 11,962 | 23,844 | | Hispanic or Latino | 1,396 | 1,245 | 2,641 | | Some Other Race | 826 | 688 | 1,514 | | Two or More Races | 209 | 192 | 401 | | American Indian | 105 | 98 | 203 | | Asian | 46 | 57 | 103 |
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| Total population in Jefferson County | | | Total Population: | 26,140 | | Male Population: | 13,114 | | Female Population: | 13,026 |
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| Median age in Jefferson County | | | Both sexes | 30 | | Male | 30 | | Female | 30 |
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| Population in households in Jefferson County | | | Total Population: | 26,029 | | Male Population: | 13,029 | | Under 5 years: | 1,419 | | 5 to 9 years: | 1,298 | | 10 to 14 years: | 1,257 | | 15 to 17 years: | 697 | | 18 and 19 years: | 372 | | 20 years: | 128 | | 21 years: | 141 | | 22 to 24 years: | 395 | | 25 to 29 years: | 815 | | 30 to 34 years: | 975 | | 35 to 39 years: | 789 | | 40 to 44 years: | 734 | | 45 to 49 years: | 774 | | 50 to 54 years: | 816 | | 55 to 59 years: | 671 | | 60 and 61 years: | 248 | | 62 to 64 years: | 305 | | 65 and 66 years: | 168 | | 67 to 69 years: | 243 | | 70 to 74 years: | 329 | | 75 to 79 years: | 209 | | 80 to 84 years: | 146 | | 85 years and over: | 100 | | Female Population: | 13,000 | | Under 5 years: | 1,399 | | 5 to 9 years: | 1,330 | | 10 to 14 years: | 1,193 | | 15 to 17 years: | 687 | | 18 and 19 years: | 304 | | 20 years: | 145 | | 21 years: | 131 | | 22 to 24 years: | 417 | | 25 to 29 years: | 909 | | 30 to 34 years: | 894 | | 35 to 39 years: | 823 | | 40 to 44 years: | 676 | | 45 to 49 years: | 810 | | 50 to 54 years: | 791 | | 55 to 59 years: | 619 | | 60 and 61 years: | 240 | | 62 to 64 years: | 327 | | 65 and 66 years: | 164 | | 67 to 69 years: | 244 | | 70 to 74 years: | 326 | | 75 to 79 years: | 251 | | 80 to 84 years: | 169 | | 85 years and over: | 151 |
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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: | 8,146 | | Family led homes: | 6,698 | | Husband-wife family: | 5,748 | | Other family: | 950 | | Population of male led with no wife present: | 345 | | Population female led with no husband present: | 605 | | Population of Nonfamily homes: | 1,448 | | Population living alone: | 1,225 | | Population not living alone: | 223 |
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| Total occupied homes in Jefferson County with people under 18 years old: | | | Total: | 8,146 | | Population of homes with one or more people under 18 years: | 3,882 | | Population of family homes: | 3,862 | | Husband-wife family: | 3,208 | | Under 6 years only: | 765 | | Under 6 years and 6 to 17 years: | 1,052 | | 6 to 17 years only: | 1,391 | | Other family: | 654 | | Male householder, no wife present: | 224 | | Under 6 years only: | 44 | | Under 6 years and 6 to 17 years: | 54 | | 6 to 17 years only: | 126 | | Female led with no husband present: | 430 | | Under 6 years only: | 89 | | Under 6 years and 6 to 17 years: | 118 | | 6 to 17 years only: | 223 | | Nonfamily households: | 20 | | Male led households: | 17 | | Under 6 years only: | 2 | | Under 6 years and 6 to 17 years: | 3 | | 6 to 17 years only: | 12 | | Female led householder: | 3 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 3 | | Households with no people under 18 years: | 4,264 | | Family households: | 2,836 | | Husband-wife family: | 2,540 | | Other family: | 296 | | Male led with no wife present: | 121 | | Female led with no husband present: | 175 | | Nonfamily households: | 1,428 | | Male led householder: | 692 | | Female led householder: | 736 |
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| Total number led homes in Jefferson County, by type | | | Total Home Population: | 8,146 | | Population of Family homes: | 6,698 | | Population of 15 to 24 year olds: | 241 | | Population of 25 to 34 year olds: | 1,481 | | Population of 35 to 44 year olds: | 1,422 | | Population of 45 to 54 year olds: | 1,428 | | Population of 55 to 59 year olds: | 598 | | Population of 60 to 64 year olds: | 474 | | Population of 65 to 74 year olds: | 647 | | Population of 75 to 84 year olds: | 333 | | Population of 85 year olds and over: | 74 | | Population of Nonfamily Homes: | 1,448 | | Population of 15 to 24 year olds: | 65 | | Population of 25 to 34 year olds: | 143 | | Population of 35 to 44 year olds: | 136 | | Population of 45 to 54 year olds: | 255 | | Population of 55 to 59 year olds: | 140 | | Population of 60 to 64 year olds: | 139 | | Population of 65 to 74 year olds: | 251 | | Population of 75 to 84 year olds: | 200 | | Population of 85 year olds and over: | 119 |
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| households in Jefferson County containing people over 60 | | | Total Population: | 8,146 | | Population of homes with one or more people 60 years and over: | 2,406 | | 1-person household: | 665 | | 2-or-more-person household: | 1,741 | | Family households: | 1,687 | | Nonfamily households: | 54 | | Population of homes with no people 60 years and over: | 5,740 | | 1-person household: | 560 | | 2-or-more-person household: | 5,180 | | Family homes: | 5,011 | | Nonfamily homes: | 169 |
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| homes in Jefferson County with multiple generations. | | | Total Population: | 8,146 | | Home has three or more generations: | 301 | | Home does not have three or more generations: | 7,845 |
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| Unmarried population in Jefferson County under 18 years old in homes | | | Total Population: | 9,276 | | Unmarried partner of home lead present: | 309 | | In family homes: | 291 | | Population of male led and male partner homes: | 21 | | Population of male led and female partner households: | 149 | | Population of female led and female partner households: | 3 | | Population of female led and male partner households: | 118 | | In nonfamily homes: | 18 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 16 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 2 | | No unmarried partner of home lead present: | 8,967 | | In family homes: | 8,958 | | Population of husband-wife family homes: | 7,949 | | Population of male lead with no wife present, family homes: | 247 | | Population of female lead with no husband present, family homes: | 762 | | In nonfamily homes: | 9 |
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| Population in families living in Jefferson County | | | Total Population: | 23,935 | | Population Under 18 years: | 9,204 | | Population 18 years and over: | 14,731 |
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| How long in Jefferson County have lived in one place. | | | Total: | 8,146 | | Population of Owner occupied homes: | 6,774 | | Family home: | 5,704 | | Nonfamily homess: | 1,070 | | Male led home: | 492 | | Living alone: | 407 | | Not living alone: | 85 | | Female led home: | 578 | | Living alone: | 533 | | Not living alone: | 45 | | Population of Renter occupied homes: | 1,372 | | Family run homes: | 994 | | Husband-wife family: | 675 | | Other family: | 319 | | Male led with no wife present: | 100 | | Female led with no husband present: | 219 | | Nonfamily Homes: | 378 | | Male led homes: | 217 | | Male living alone: | 160 | | Male not living alone: | 57 | | Female led homes: | 161 | | Females living alone: | 125 | | Females not living alone: | 36 |
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