Population Demographics for Buchanan County, Iowa in 2020, 2019
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| Total population in Buchanan County | | | Total Population: | 20,958 | | Male Population: | 10,401 | | Female Population: | 10,557 |
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| Median age in Buchanan County | | | Both sexes | 39 | | Male | 38 | | Female | 40 |
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| Population in households in Buchanan County | | | Total Population: | 20,615 | | Male Population: | 10,244 | | Under 5 years: | 766 | | 5 to 9 years: | 836 | | 10 to 14 years: | 801 | | 15 to 17 years: | 456 | | 18 and 19 years: | 228 | | 20 years: | 109 | | 21 years: | 105 | | 22 to 24 years: | 323 | | 25 to 29 years: | 603 | | 30 to 34 years: | 584 | | 35 to 39 years: | 597 | | 40 to 44 years: | 615 | | 45 to 49 years: | 767 | | 50 to 54 years: | 789 | | 55 to 59 years: | 690 | | 60 and 61 years: | 276 | | 62 to 64 years: | 331 | | 65 and 66 years: | 170 | | 67 to 69 years: | 269 | | 70 to 74 years: | 373 | | 75 to 79 years: | 241 | | 80 to 84 years: | 167 | | 85 years and over: | 148 | | Female Population: | 10,371 | | Under 5 years: | 798 | | 5 to 9 years: | 742 | | 10 to 14 years: | 729 | | 15 to 17 years: | 441 | | 18 and 19 years: | 216 | | 20 years: | 103 | | 21 years: | 96 | | 22 to 24 years: | 321 | | 25 to 29 years: | 570 | | 30 to 34 years: | 582 | | 35 to 39 years: | 564 | | 40 to 44 years: | 661 | | 45 to 49 years: | 781 | | 50 to 54 years: | 796 | | 55 to 59 years: | 658 | | 60 and 61 years: | 240 | | 62 to 64 years: | 372 | | 65 and 66 years: | 173 | | 67 to 69 years: | 279 | | 70 to 74 years: | 387 | | 75 to 79 years: | 309 | | 80 to 84 years: | 295 | | 85 years and over: | 258 |
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| Average household size in Buchanan County | | | Total: | 3 | | Under 18 years: | 1 | | 18 years and over: | 2 |
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| Number of occupied homes in Buchanan County | | | Total: | 8,161 | | Family led homes: | 5,661 | | Husband-wife family: | 4,685 | | Other family: | 976 | | Population of male led with no wife present: | 338 | | Population female led with no husband present: | 638 | | Population of Nonfamily homes: | 2,500 | | Population living alone: | 2,091 | | Population not living alone: | 409 |
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| Total occupied homes in Buchanan County with people under 18 years old: | | | Total: | 8,161 | | Population of homes with one or more people under 18 years: | 2,586 | | Population of family homes: | 2,547 | | Husband-wife family: | 1,885 | | Under 6 years only: | 410 | | Under 6 years and 6 to 17 years: | 499 | | 6 to 17 years only: | 976 | | Other family: | 662 | | Male householder, no wife present: | 224 | | Under 6 years only: | 55 | | Under 6 years and 6 to 17 years: | 39 | | 6 to 17 years only: | 130 | | Female led with no husband present: | 438 | | Under 6 years only: | 111 | | Under 6 years and 6 to 17 years: | 79 | | 6 to 17 years only: | 248 | | Nonfamily households: | 39 | | Male led households: | 31 | | Under 6 years only: | 7 | | Under 6 years and 6 to 17 years: | 2 | | 6 to 17 years only: | 22 | | Female led householder: | 8 | | Under 6 years only: | 3 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 5 | | Households with no people under 18 years: | 5,575 | | Family households: | 3,114 | | Husband-wife family: | 2,800 | | Other family: | 314 | | Male led with no wife present: | 114 | | Female led with no husband present: | 200 | | Nonfamily households: | 2,461 | | Male led householder: | 1,200 | | Female led householder: | 1,261 |
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| Total number led homes in Buchanan County, by type | | | Total Home Population: | 8,161 | | Population of Family homes: | 5,661 | | Population of 15 to 24 year olds: | 182 | | Population of 25 to 34 year olds: | 884 | | Population of 35 to 44 year olds: | 1,064 | | Population of 45 to 54 year olds: | 1,315 | | Population of 55 to 59 year olds: | 546 | | Population of 60 to 64 year olds: | 511 | | Population of 65 to 74 year olds: | 695 | | Population of 75 to 84 year olds: | 358 | | Population of 85 year olds and over: | 106 | | Population of Nonfamily Homes: | 2,500 | | Population of 15 to 24 year olds: | 164 | | Population of 25 to 34 year olds: | 287 | | Population of 35 to 44 year olds: | 207 | | Population of 45 to 54 year olds: | 426 | | Population of 55 to 59 year olds: | 224 | | Population of 60 to 64 year olds: | 225 | | Population of 65 to 74 year olds: | 362 | | Population of 75 to 84 year olds: | 374 | | Population of 85 year olds and over: | 231 |
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| households in Buchanan County containing people over 60 | | | Total Population: | 8,161 | | Population of homes with one or more people 60 years and over: | 2,979 | | 1-person household: | 1,142 | | 2-or-more-person household: | 1,837 | | Family households: | 1,777 | | Nonfamily households: | 60 | | Population of homes with no people 60 years and over: | 5,182 | | 1-person household: | 949 | | 2-or-more-person household: | 4,233 | | Family homes: | 3,884 | | Nonfamily homes: | 349 |
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| homes in Buchanan County with multiple generations. | | | Total Population: | 8,161 | | Home has three or more generations: | 147 | | Home does not have three or more generations: | 8,014 |
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| Unmarried population in Buchanan County under 18 years old in homes | | | Total Population: | 5,566 | | Unmarried partner of home lead present: | 423 | | In family homes: | 372 | | Population of male led and male partner homes: | 13 | | Population of male led and female partner households: | 182 | | Population of female led and female partner households: | 19 | | Population of female led and male partner households: | 158 | | In nonfamily homes: | 51 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 45 | | Population of female led and female partner homes: | 1 | | Population of female led and male partner homes: | 5 | | No unmarried partner of home lead present: | 5,143 | | In family homes: | 5,135 | | Population of husband-wife family homes: | 4,336 | | Population of male lead with no wife present, family homes: | 200 | | Population of female lead with no husband present, family homes: | 599 | | In nonfamily homes: | 8 |
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| Population in families living in Buchanan County | | | Total Population: | 17,259 | | Population Under 18 years: | 5,466 | | Population 18 years and over: | 11,793 |
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| How long in Buchanan County have lived in one place. | | | Total: | 8,161 | | Population of Owner occupied homes: | 6,441 | | Family home: | 4,848 | | Nonfamily homess: | 1,593 | | Male led home: | 769 | | Living alone: | 611 | | Not living alone: | 158 | | Female led home: | 824 | | Living alone: | 745 | | Not living alone: | 79 | | Population of Renter occupied homes: | 1,720 | | Family run homes: | 813 | | Husband-wife family: | 467 | | Other family: | 346 | | Male led with no wife present: | 97 | | Female led with no husband present: | 249 | | Nonfamily Homes: | 907 | | Male led homes: | 462 | | Male living alone: | 356 | | Male not living alone: | 106 | | Female led homes: | 445 | | Females living alone: | 379 | | Females not living alone: | 66 |
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