Population Demographics for Washington County, Iowa in 2020, 2019
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| Total population in Washington County | | Total Population: | 21,704 | Male Population: | 10,626 | Female Population: | 11,078 |
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| Median age in Washington County | | Both sexes | 42 | Male | 40 | Female | 43 |
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| Population in households in Washington County | | Total Population: | 21,394 | Male Population: | 10,517 | Under 5 years: | 697 | 5 to 9 years: | 783 | 10 to 14 years: | 813 | 15 to 17 years: | 492 | 18 and 19 years: | 263 | 20 years: | 84 | 21 years: | 85 | 22 to 24 years: | 298 | 25 to 29 years: | 583 | 30 to 34 years: | 592 | 35 to 39 years: | 582 | 40 to 44 years: | 701 | 45 to 49 years: | 812 | 50 to 54 years: | 794 | 55 to 59 years: | 747 | 60 and 61 years: | 298 | 62 to 64 years: | 368 | 65 and 66 years: | 179 | 67 to 69 years: | 282 | 70 to 74 years: | 369 | 75 to 79 years: | 287 | 80 to 84 years: | 210 | 85 years and over: | 198 | Female Population: | 10,877 | Under 5 years: | 689 | 5 to 9 years: | 735 | 10 to 14 years: | 772 | 15 to 17 years: | 478 | 18 and 19 years: | 220 | 20 years: | 76 | 21 years: | 98 | 22 to 24 years: | 283 | 25 to 29 years: | 564 | 30 to 34 years: | 592 | 35 to 39 years: | 613 | 40 to 44 years: | 708 | 45 to 49 years: | 810 | 50 to 54 years: | 819 | 55 to 59 years: | 777 | 60 and 61 years: | 271 | 62 to 64 years: | 387 | 65 and 66 years: | 212 | 67 to 69 years: | 279 | 70 to 74 years: | 393 | 75 to 79 years: | 371 | 80 to 84 years: | 309 | 85 years and over: | 421 |
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| Average household size in Washington County | | Total: | 2 | Under 18 years: | 1 | 18 years and over: | 2 |
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| Number of occupied homes in Washington County | | Total: | 8,741 | Family led homes: | 5,874 | Husband-wife family: | 4,853 | Other family: | 1,021 | Population of male led with no wife present: | 311 | Population female led with no husband present: | 710 | Population of Nonfamily homes: | 2,867 | Population living alone: | 2,450 | Population not living alone: | 417 |
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| Total occupied homes in Washington County with people under 18 years old: | | Total: | 8,741 | Population of homes with one or more people under 18 years: | 2,711 | Population of family homes: | 2,678 | Husband-wife family: | 1,982 | Under 6 years only: | 432 | Under 6 years and 6 to 17 years: | 438 | 6 to 17 years only: | 1,112 | Other family: | 696 | Male householder, no wife present: | 206 | Under 6 years only: | 65 | Under 6 years and 6 to 17 years: | 38 | 6 to 17 years only: | 103 | Female led with no husband present: | 490 | Under 6 years only: | 99 | Under 6 years and 6 to 17 years: | 87 | 6 to 17 years only: | 304 | Nonfamily households: | 33 | Male led households: | 21 | Under 6 years only: | 5 | Under 6 years and 6 to 17 years: | 2 | 6 to 17 years only: | 14 | Female led householder: | 12 | Under 6 years only: | 1 | Under 6 years and 6 to 17 years: | 1 | 6 to 17 years only: | 10 | Households with no people under 18 years: | 6,030 | Family households: | 3,196 | Husband-wife family: | 2,871 | Other family: | 325 | Male led with no wife present: | 105 | Female led with no husband present: | 220 | Nonfamily households: | 2,834 | Male led householder: | 1,304 | Female led householder: | 1,530 |
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| Total number led homes in Washington County, by type | | Total Home Population: | 8,741 | Population of Family homes: | 5,874 | Population of 15 to 24 year olds: | 150 | Population of 25 to 34 year olds: | 846 | Population of 35 to 44 year olds: | 1,174 | Population of 45 to 54 year olds: | 1,325 | Population of 55 to 59 year olds: | 594 | Population of 60 to 64 year olds: | 530 | Population of 65 to 74 year olds: | 698 | Population of 75 to 84 year olds: | 415 | Population of 85 year olds and over: | 142 | Population of Nonfamily Homes: | 2,867 | Population of 15 to 24 year olds: | 143 | Population of 25 to 34 year olds: | 305 | Population of 35 to 44 year olds: | 253 | Population of 45 to 54 year olds: | 478 | Population of 55 to 59 year olds: | 271 | Population of 60 to 64 year olds: | 260 | Population of 65 to 74 year olds: | 380 | Population of 75 to 84 year olds: | 403 | Population of 85 year olds and over: | 374 |
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| households in Washington County containing people over 60 | | Total Population: | 8,741 | Population of homes with one or more people 60 years and over: | 3,382 | 1-person household: | 1,339 | 2-or-more-person household: | 2,043 | Family households: | 1,947 | Nonfamily households: | 96 | Population of homes with no people 60 years and over: | 5,359 | 1-person household: | 1,111 | 2-or-more-person household: | 4,248 | Family homes: | 3,927 | Nonfamily homes: | 321 |
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| homes in Washington County with multiple generations. | | Total Population: | 8,741 | Home has three or more generations: | 136 | Home does not have three or more generations: | 8,605 |
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| Unmarried population in Washington County under 18 years old in homes | | Total Population: | 5,455 | Unmarried partner of home lead present: | 440 | In family homes: | 404 | Population of male led and male partner homes: | 8 | Population of male led and female partner households: | 175 | Population of female led and female partner households: | 21 | Population of female led and male partner households: | 200 | In nonfamily homes: | 36 | Population of male led and male partner homes: | 0 | Population of male led and female partner homes: | 29 | Population of female led and female partner homes: | 2 | Population of female led and male partner homes: | 5 | No unmarried partner of home lead present: | 5,015 | In family homes: | 5,003 | Population of husband-wife family homes: | 4,172 | Population of male lead with no wife present, family homes: | 169 | Population of female lead with no husband present, family homes: | 662 | In nonfamily homes: | 12 |
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| Population in families living in Washington County | | Total Population: | 17,598 | Population Under 18 years: | 5,343 | Population 18 years and over: | 12,255 |
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| How long in Washington County have lived in one place. | | Total: | 8,741 | Population of Owner occupied homes: | 6,539 | Family home: | 4,890 | Nonfamily homess: | 1,649 | Male led home: | 727 | Living alone: | 588 | Not living alone: | 139 | Female led home: | 922 | Living alone: | 828 | Not living alone: | 94 | Population of Renter occupied homes: | 2,202 | Family run homes: | 984 | Husband-wife family: | 568 | Other family: | 416 | Male led with no wife present: | 109 | Female led with no husband present: | 307 | Nonfamily Homes: | 1,218 | Male led homes: | 598 | Male living alone: | 482 | Male not living alone: | 116 | Female led homes: | 620 | Females living alone: | 552 | Females not living alone: | 68 |
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