Population Demographics for Gem County, Idaho in 2020, 2019
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| Total population in Gem County | | Total Population: | 16,719 | Male Population: | 8,283 | Female Population: | 8,436 |
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| Median age in Gem County | | Both sexes | 42 | Male | 41 | Female | 44 |
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| Population in households in Gem County | | Total Population: | 16,568 | Male Population: | 8,193 | Under 5 years: | 597 | 5 to 9 years: | 546 | 10 to 14 years: | 587 | 15 to 17 years: | 392 | 18 and 19 years: | 216 | 20 years: | 93 | 21 years: | 81 | 22 to 24 years: | 214 | 25 to 29 years: | 406 | 30 to 34 years: | 381 | 35 to 39 years: | 412 | 40 to 44 years: | 504 | 45 to 49 years: | 576 | 50 to 54 years: | 632 | 55 to 59 years: | 579 | 60 and 61 years: | 212 | 62 to 64 years: | 323 | 65 and 66 years: | 199 | 67 to 69 years: | 268 | 70 to 74 years: | 384 | 75 to 79 years: | 241 | 80 to 84 years: | 190 | 85 years and over: | 160 | Female Population: | 8,375 | Under 5 years: | 504 | 5 to 9 years: | 519 | 10 to 14 years: | 602 | 15 to 17 years: | 338 | 18 and 19 years: | 197 | 20 years: | 73 | 21 years: | 64 | 22 to 24 years: | 228 | 25 to 29 years: | 395 | 30 to 34 years: | 427 | 35 to 39 years: | 427 | 40 to 44 years: | 531 | 45 to 49 years: | 630 | 50 to 54 years: | 671 | 55 to 59 years: | 592 | 60 and 61 years: | 231 | 62 to 64 years: | 344 | 65 and 66 years: | 193 | 67 to 69 years: | 308 | 70 to 74 years: | 352 | 75 to 79 years: | 296 | 80 to 84 years: | 213 | 85 years and over: | 240 |
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| Average household size in Gem County | | Total: | 2 | Under 18 years: | 0 | 18 years and over: | 1 |
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| Number of occupied homes in Gem County | | Total: | 6,495 | Family led homes: | 4,611 | Husband-wife family: | 3,698 | Other family: | 913 | Population of male led with no wife present: | 312 | Population female led with no husband present: | 601 | Population of Nonfamily homes: | 1,884 | Population living alone: | 1,578 | Population not living alone: | 306 |
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| Total occupied homes in Gem County with people under 18 years old: | | Total: | 6,495 | Population of homes with one or more people under 18 years: | 1,988 | Population of family homes: | 1,967 | Husband-wife family: | 1,401 | Under 6 years only: | 289 | Under 6 years and 6 to 17 years: | 359 | 6 to 17 years only: | 753 | Other family: | 566 | Male householder, no wife present: | 186 | Under 6 years only: | 44 | Under 6 years and 6 to 17 years: | 32 | 6 to 17 years only: | 110 | Female led with no husband present: | 380 | Under 6 years only: | 80 | Under 6 years and 6 to 17 years: | 77 | 6 to 17 years only: | 223 | Nonfamily households: | 21 | Male led households: | 14 | Under 6 years only: | 1 | Under 6 years and 6 to 17 years: | 1 | 6 to 17 years only: | 12 | Female led householder: | 7 | Under 6 years only: | 1 | Under 6 years and 6 to 17 years: | 2 | 6 to 17 years only: | 4 | Households with no people under 18 years: | 4,507 | Family households: | 2,644 | Husband-wife family: | 2,297 | Other family: | 347 | Male led with no wife present: | 126 | Female led with no husband present: | 221 | Nonfamily households: | 1,863 | Male led householder: | 849 | Female led householder: | 1,014 |
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| Total number led homes in Gem County, by type | | Total Home Population: | 6,495 | Population of Family homes: | 4,611 | Population of 15 to 24 year olds: | 134 | Population of 25 to 34 year olds: | 593 | Population of 35 to 44 year olds: | 825 | Population of 45 to 54 year olds: | 1,017 | Population of 55 to 59 year olds: | 456 | Population of 60 to 64 year olds: | 413 | Population of 65 to 74 year olds: | 722 | Population of 75 to 84 year olds: | 357 | Population of 85 year olds and over: | 94 | Population of Nonfamily Homes: | 1,884 | Population of 15 to 24 year olds: | 67 | Population of 25 to 34 year olds: | 110 | Population of 35 to 44 year olds: | 112 | Population of 45 to 54 year olds: | 296 | Population of 55 to 59 year olds: | 198 | Population of 60 to 64 year olds: | 216 | Population of 65 to 74 year olds: | 354 | Population of 75 to 84 year olds: | 308 | Population of 85 year olds and over: | 223 |
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| households in Gem County containing people over 60 | | Total Population: | 6,495 | Population of homes with one or more people 60 years and over: | 2,876 | 1-person household: | 1,004 | 2-or-more-person household: | 1,872 | Family households: | 1,760 | Nonfamily households: | 112 | Population of homes with no people 60 years and over: | 3,619 | 1-person household: | 574 | 2-or-more-person household: | 3,045 | Family homes: | 2,851 | Nonfamily homes: | 194 |
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| homes in Gem County with multiple generations. | | Total Population: | 6,495 | Home has three or more generations: | 212 | Home does not have three or more generations: | 6,283 |
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| Unmarried population in Gem County under 18 years old in homes | | Total Population: | 4,080 | Unmarried partner of home lead present: | 330 | In family homes: | 315 | Population of male led and male partner homes: | 11 | Population of male led and female partner households: | 162 | Population of female led and female partner households: | 16 | Population of female led and male partner households: | 126 | In nonfamily homes: | 15 | Population of male led and male partner homes: | 0 | Population of male led and female partner homes: | 14 | Population of female led and female partner homes: | 0 | Population of female led and male partner homes: | 1 | No unmarried partner of home lead present: | 3,750 | In family homes: | 3,734 | Population of husband-wife family homes: | 3,020 | Population of male lead with no wife present, family homes: | 164 | Population of female lead with no husband present, family homes: | 550 | In nonfamily homes: | 16 |
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| Population in families living in Gem County | | Total Population: | 13,901 | Population Under 18 years: | 3,990 | Population 18 years and over: | 9,911 |
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| How long in Gem County have lived in one place. | | Total: | 6,495 | Population of Owner occupied homes: | 4,931 | Family home: | 3,699 | Nonfamily homess: | 1,232 | Male led home: | 554 | Living alone: | 457 | Not living alone: | 97 | Female led home: | 678 | Living alone: | 592 | Not living alone: | 86 | Population of Renter occupied homes: | 1,564 | Family run homes: | 912 | Husband-wife family: | 545 | Other family: | 367 | Male led with no wife present: | 114 | Female led with no husband present: | 253 | Nonfamily Homes: | 652 | Male led homes: | 309 | Male living alone: | 237 | Male not living alone: | 72 | Female led homes: | 343 | Females living alone: | 292 | Females not living alone: | 51 |
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