Population Demographics for Jefferson County, Montana in 2020, 2019
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| Total population in Jefferson County | | | Total Population: | 11,406 | | Male Population: | 5,814 | | Female Population: | 5,592 |
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| Median age in Jefferson County | | | Both sexes | 46 | | Male | 46 | | Female | 46 |
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| Population in households in Jefferson County | | | Total Population: | 11,176 | | Male Population: | 5,701 | | Under 5 years: | 310 | | 5 to 9 years: | 345 | | 10 to 14 years: | 416 | | 15 to 17 years: | 262 | | 18 and 19 years: | 130 | | 20 years: | 35 | | 21 years: | 41 | | 22 to 24 years: | 116 | | 25 to 29 years: | 200 | | 30 to 34 years: | 218 | | 35 to 39 years: | 301 | | 40 to 44 years: | 336 | | 45 to 49 years: | 484 | | 50 to 54 years: | 552 | | 55 to 59 years: | 618 | | 60 and 61 years: | 212 | | 62 to 64 years: | 319 | | 65 and 66 years: | 166 | | 67 to 69 years: | 184 | | 70 to 74 years: | 208 | | 75 to 79 years: | 121 | | 80 to 84 years: | 88 | | 85 years and over: | 39 | | Female Population: | 5,475 | | Under 5 years: | 269 | | 5 to 9 years: | 341 | | 10 to 14 years: | 386 | | 15 to 17 years: | 264 | | 18 and 19 years: | 102 | | 20 years: | 39 | | 21 years: | 37 | | 22 to 24 years: | 94 | | 25 to 29 years: | 192 | | 30 to 34 years: | 228 | | 35 to 39 years: | 298 | | 40 to 44 years: | 381 | | 45 to 49 years: | 493 | | 50 to 54 years: | 591 | | 55 to 59 years: | 570 | | 60 and 61 years: | 163 | | 62 to 64 years: | 271 | | 65 and 66 years: | 125 | | 67 to 69 years: | 160 | | 70 to 74 years: | 196 | | 75 to 79 years: | 125 | | 80 to 84 years: | 92 | | 85 years and over: | 58 |
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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: | 4,512 | | Family led homes: | 3,301 | | Husband-wife family: | 2,875 | | Other family: | 426 | | Population of male led with no wife present: | 181 | | Population female led with no husband present: | 245 | | Population of Nonfamily homes: | 1,211 | | Population living alone: | 1,019 | | Population not living alone: | 192 |
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| Total occupied homes in Jefferson County with people under 18 years old: | | | Total: | 4,512 | | Population of homes with one or more people under 18 years: | 1,298 | | Population of family homes: | 1,292 | | Husband-wife family: | 1,020 | | Under 6 years only: | 178 | | Under 6 years and 6 to 17 years: | 198 | | 6 to 17 years only: | 644 | | Other family: | 272 | | Male householder, no wife present: | 119 | | Under 6 years only: | 22 | | Under 6 years and 6 to 17 years: | 24 | | 6 to 17 years only: | 73 | | Female led with no husband present: | 153 | | Under 6 years only: | 38 | | Under 6 years and 6 to 17 years: | 23 | | 6 to 17 years only: | 92 | | Nonfamily households: | 6 | | Male led households: | 4 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 4 | | Female led householder: | 2 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 2 | | Households with no people under 18 years: | 3,214 | | Family households: | 2,009 | | Husband-wife family: | 1,855 | | Other family: | 154 | | Male led with no wife present: | 62 | | Female led with no husband present: | 92 | | Nonfamily households: | 1,205 | | Male led householder: | 671 | | Female led householder: | 534 |
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| Total number led homes in Jefferson County, by type | | | Total Home Population: | 4,512 | | Population of Family homes: | 3,301 | | Population of 15 to 24 year olds: | 30 | | Population of 25 to 34 year olds: | 274 | | Population of 35 to 44 year olds: | 573 | | Population of 45 to 54 year olds: | 860 | | Population of 55 to 59 year olds: | 499 | | Population of 60 to 64 year olds: | 422 | | Population of 65 to 74 year olds: | 448 | | Population of 75 to 84 year olds: | 170 | | Population of 85 year olds and over: | 25 | | Population of Nonfamily Homes: | 1,211 | | Population of 15 to 24 year olds: | 34 | | Population of 25 to 34 year olds: | 79 | | Population of 35 to 44 year olds: | 86 | | Population of 45 to 54 year olds: | 263 | | Population of 55 to 59 year olds: | 193 | | Population of 60 to 64 year olds: | 160 | | Population of 65 to 74 year olds: | 219 | | Population of 75 to 84 year olds: | 130 | | Population of 85 year olds and over: | 47 |
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| households in Jefferson County containing people over 60 | | | Total Population: | 4,512 | | Population of homes with one or more people 60 years and over: | 1,739 | | 1-person household: | 510 | | 2-or-more-person household: | 1,229 | | Family households: | 1,171 | | Nonfamily households: | 58 | | Population of homes with no people 60 years and over: | 2,773 | | 1-person household: | 509 | | 2-or-more-person household: | 2,264 | | Family homes: | 2,130 | | Nonfamily homes: | 134 |
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| homes in Jefferson County with multiple generations. | | | Total Population: | 4,512 | | Home has three or more generations: | 87 | | Home does not have three or more generations: | 4,425 |
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| Unmarried population in Jefferson County under 18 years old in homes | | | Total Population: | 2,592 | | Unmarried partner of home lead present: | 152 | | In family homes: | 147 | | Population of male led and male partner homes: | 10 | | Population of male led and female partner households: | 79 | | Population of female led and female partner households: | 9 | | Population of female led and male partner households: | 49 | | In nonfamily homes: | 5 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 5 | | 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: | 2,440 | | In family homes: | 2,439 | | Population of husband-wife family homes: | 2,093 | | Population of male lead with no wife present, family homes: | 135 | | Population of female lead with no husband present, family homes: | 211 | | In nonfamily homes: | 1 |
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| Population in families living in Jefferson County | | | Total Population: | 9,580 | | Population Under 18 years: | 2,570 | | Population 18 years and over: | 7,010 |
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| How long in Jefferson County have lived in one place. | | | Total: | 4,512 | | Population of Owner occupied homes: | 3,779 | | Family home: | 2,925 | | Nonfamily homess: | 854 | | Male led home: | 470 | | Living alone: | 389 | | Not living alone: | 81 | | Female led home: | 384 | | Living alone: | 331 | | Not living alone: | 53 | | Population of Renter occupied homes: | 733 | | Family run homes: | 376 | | Husband-wife family: | 234 | | Other family: | 142 | | Male led with no wife present: | 62 | | Female led with no husband present: | 80 | | Nonfamily Homes: | 357 | | Male led homes: | 205 | | Male living alone: | 171 | | Male not living alone: | 34 | | Female led homes: | 152 | | Females living alone: | 128 | | Females not living alone: | 24 |
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