Population Demographics for Watertown, South Dakota in 2020, 2019
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| Total population in Watertown | | | Total Population: | 21,482 | | Male Population: | 10,563 | | Female Population: | 10,919 |
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| Median age in Watertown | | | Both sexes | 36 | | Male | 34 | | Female | 38 |
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| Population in households in Watertown | | | Total Population: | 21,111 | | Male Population: | 10,418 | | Under 5 years: | 861 | | 5 to 9 years: | 762 | | 10 to 14 years: | 668 | | 15 to 17 years: | 382 | | 18 and 19 years: | 356 | | 20 years: | 191 | | 21 years: | 162 | | 22 to 24 years: | 438 | | 25 to 29 years: | 794 | | 30 to 34 years: | 673 | | 35 to 39 years: | 608 | | 40 to 44 years: | 615 | | 45 to 49 years: | 699 | | 50 to 54 years: | 726 | | 55 to 59 years: | 722 | | 60 and 61 years: | 215 | | 62 to 64 years: | 280 | | 65 and 66 years: | 164 | | 67 to 69 years: | 202 | | 70 to 74 years: | 305 | | 75 to 79 years: | 234 | | 80 to 84 years: | 199 | | 85 years and over: | 162 | | Female Population: | 10,693 | | Under 5 years: | 821 | | 5 to 9 years: | 677 | | 10 to 14 years: | 632 | | 15 to 17 years: | 391 | | 18 and 19 years: | 333 | | 20 years: | 149 | | 21 years: | 125 | | 22 to 24 years: | 438 | | 25 to 29 years: | 771 | | 30 to 34 years: | 683 | | 35 to 39 years: | 557 | | 40 to 44 years: | 577 | | 45 to 49 years: | 759 | | 50 to 54 years: | 783 | | 55 to 59 years: | 639 | | 60 and 61 years: | 224 | | 62 to 64 years: | 318 | | 65 and 66 years: | 173 | | 67 to 69 years: | 242 | | 70 to 74 years: | 410 | | 75 to 79 years: | 332 | | 80 to 84 years: | 300 | | 85 years and over: | 359 |
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| Average household size in Watertown | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Watertown | | | Total: | 9,278 | | Family led homes: | 5,563 | | Husband-wife family: | 4,238 | | Other family: | 1,325 | | Population of male led with no wife present: | 398 | | Population female led with no husband present: | 927 | | Population of Nonfamily homes: | 3,715 | | Population living alone: | 3,065 | | Population not living alone: | 650 |
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| Total occupied homes in Watertown with people under 18 years old: | | | Total: | 9,278 | | Population of homes with one or more people under 18 years: | 2,744 | | Population of family homes: | 2,710 | | Husband-wife family: | 1,754 | | Under 6 years only: | 487 | | Under 6 years and 6 to 17 years: | 404 | | 6 to 17 years only: | 863 | | Other family: | 956 | | Male householder, no wife present: | 267 | | Under 6 years only: | 100 | | Under 6 years and 6 to 17 years: | 38 | | 6 to 17 years only: | 129 | | Female led with no husband present: | 689 | | Under 6 years only: | 236 | | Under 6 years and 6 to 17 years: | 148 | | 6 to 17 years only: | 305 | | Nonfamily households: | 34 | | Male led households: | 31 | | Under 6 years only: | 10 | | Under 6 years and 6 to 17 years: | 5 | | 6 to 17 years only: | 16 | | 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: | 6,534 | | Family households: | 2,853 | | Husband-wife family: | 2,484 | | Other family: | 369 | | Male led with no wife present: | 131 | | Female led with no husband present: | 238 | | Nonfamily households: | 3,681 | | Male led householder: | 1,721 | | Female led householder: | 1,960 |
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| Total number led homes in Watertown, by type | | | Total Home Population: | 9,278 | | Population of Family homes: | 5,563 | | Population of 15 to 24 year olds: | 274 | | Population of 25 to 34 year olds: | 1,091 | | Population of 35 to 44 year olds: | 1,032 | | Population of 45 to 54 year olds: | 1,214 | | Population of 55 to 59 year olds: | 550 | | Population of 60 to 64 year olds: | 398 | | Population of 65 to 74 year olds: | 561 | | Population of 75 to 84 year olds: | 343 | | Population of 85 year olds and over: | 100 | | Population of Nonfamily Homes: | 3,715 | | Population of 15 to 24 year olds: | 592 | | Population of 25 to 34 year olds: | 492 | | Population of 35 to 44 year olds: | 305 | | Population of 45 to 54 year olds: | 592 | | Population of 55 to 59 year olds: | 293 | | Population of 60 to 64 year olds: | 235 | | Population of 65 to 74 year olds: | 401 | | Population of 75 to 84 year olds: | 453 | | Population of 85 year olds and over: | 352 |
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| households in Watertown containing people over 60 | | | Total Population: | 9,278 | | Population of homes with one or more people 60 years and over: | 2,958 | | 1-person household: | 1,373 | | 2-or-more-person household: | 1,585 | | Family households: | 1,505 | | Nonfamily households: | 80 | | Population of homes with no people 60 years and over: | 6,320 | | 1-person household: | 1,692 | | 2-or-more-person household: | 4,628 | | Family homes: | 4,058 | | Nonfamily homes: | 570 |
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| homes in Watertown with multiple generations. | | | Total Population: | 9,278 | | Home has three or more generations: | 109 | | Home does not have three or more generations: | 9,169 |
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| Unmarried population in Watertown under 18 years old in homes | | | Total Population: | 5,190 | | Unmarried partner of home lead present: | 570 | | In family homes: | 521 | | Population of male led and male partner homes: | 9 | | Population of male led and female partner households: | 221 | | Population of female led and female partner households: | 17 | | Population of female led and male partner households: | 274 | | In nonfamily homes: | 49 | | 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: | 0 | | Population of female led and male partner homes: | 4 | | No unmarried partner of home lead present: | 4,620 | | In family homes: | 4,611 | | Population of husband-wife family homes: | 3,516 | | Population of male lead with no wife present, family homes: | 202 | | Population of female lead with no husband present, family homes: | 893 | | In nonfamily homes: | 9 |
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| Population in families living in Watertown | | | Total Population: | 16,113 | | Population Under 18 years: | 5,088 | | Population 18 years and over: | 11,025 |
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| How long in Watertown have lived in one place. | | | Total: | 9,278 | | Population of Owner occupied homes: | 5,894 | | Family home: | 4,358 | | Nonfamily homess: | 1,536 | | Male led home: | 728 | | Living alone: | 569 | | Not living alone: | 159 | | Female led home: | 808 | | Living alone: | 718 | | Not living alone: | 90 | | Population of Renter occupied homes: | 3,384 | | Family run homes: | 1,205 | | Husband-wife family: | 527 | | Other family: | 678 | | Male led with no wife present: | 159 | | Female led with no husband present: | 519 | | Nonfamily Homes: | 2,179 | | Male led homes: | 1,024 | | Male living alone: | 791 | | Male not living alone: | 233 | | Female led homes: | 1,155 | | Females living alone: | 987 | | Females not living alone: | 168 |
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