Population Demographics for Clay County, South Dakota in 2020, 2019
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| Total population in Clay County | | Total Population: | 13,864 | Male Population: | 6,740 | Female Population: | 7,124 |
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| Median age in Clay County | | Both sexes | 25 | Male | 25 | Female | 24 |
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| Population in households in Clay County | | Total Population: | 11,627 | Male Population: | 5,767 | Under 5 years: | 370 | 5 to 9 years: | 352 | 10 to 14 years: | 301 | 15 to 17 years: | 190 | 18 and 19 years: | 132 | 20 years: | 135 | 21 years: | 254 | 22 to 24 years: | 708 | 25 to 29 years: | 554 | 30 to 34 years: | 347 | 35 to 39 years: | 279 | 40 to 44 years: | 289 | 45 to 49 years: | 305 | 50 to 54 years: | 335 | 55 to 59 years: | 348 | 60 and 61 years: | 150 | 62 to 64 years: | 154 | 65 and 66 years: | 89 | 67 to 69 years: | 114 | 70 to 74 years: | 128 | 75 to 79 years: | 92 | 80 to 84 years: | 74 | 85 years and over: | 67 | Female Population: | 5,860 | Under 5 years: | 353 | 5 to 9 years: | 341 | 10 to 14 years: | 318 | 15 to 17 years: | 188 | 18 and 19 years: | 108 | 20 years: | 160 | 21 years: | 320 | 22 to 24 years: | 749 | 25 to 29 years: | 481 | 30 to 34 years: | 322 | 35 to 39 years: | 254 | 40 to 44 years: | 304 | 45 to 49 years: | 344 | 50 to 54 years: | 328 | 55 to 59 years: | 318 | 60 and 61 years: | 128 | 62 to 64 years: | 130 | 65 and 66 years: | 76 | 67 to 69 years: | 112 | 70 to 74 years: | 160 | 75 to 79 years: | 140 | 80 to 84 years: | 95 | 85 years and over: | 131 |
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| Average household size in Clay County | | Total: | 2 | Under 18 years: | 0 | 18 years and over: | 1 |
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| Number of occupied homes in Clay County | | Total: | 5,110 | Family led homes: | 2,628 | Husband-wife family: | 2,089 | Other family: | 539 | Population of male led with no wife present: | 165 | Population female led with no husband present: | 374 | Population of Nonfamily homes: | 2,482 | Population living alone: | 1,658 | Population not living alone: | 824 |
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| Total occupied homes in Clay County with people under 18 years old: | | Total: | 5,110 | Population of homes with one or more people under 18 years: | 1,262 | Population of family homes: | 1,254 | Husband-wife family: | 881 | Under 6 years only: | 235 | Under 6 years and 6 to 17 years: | 190 | 6 to 17 years only: | 456 | Other family: | 373 | Male householder, no wife present: | 111 | Under 6 years only: | 36 | Under 6 years and 6 to 17 years: | 11 | 6 to 17 years only: | 64 | Female led with no husband present: | 262 | Under 6 years only: | 83 | Under 6 years and 6 to 17 years: | 30 | 6 to 17 years only: | 149 | Nonfamily households: | 8 | Male led households: | 4 | Under 6 years only: | 1 | Under 6 years and 6 to 17 years: | 1 | 6 to 17 years only: | 2 | Female led householder: | 4 | Under 6 years only: | 0 | Under 6 years and 6 to 17 years: | 0 | 6 to 17 years only: | 4 | Households with no people under 18 years: | 3,848 | Family households: | 1,374 | Husband-wife family: | 1,208 | Other family: | 166 | Male led with no wife present: | 54 | Female led with no husband present: | 112 | Nonfamily households: | 2,474 | Male led householder: | 1,225 | Female led householder: | 1,249 |
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| Total number led homes in Clay County, by type | | Total Home Population: | 5,110 | Population of Family homes: | 2,628 | Population of 15 to 24 year olds: | 158 | Population of 25 to 34 year olds: | 514 | Population of 35 to 44 year olds: | 508 | Population of 45 to 54 year olds: | 515 | Population of 55 to 59 year olds: | 257 | Population of 60 to 64 year olds: | 228 | Population of 65 to 74 year olds: | 266 | Population of 75 to 84 year olds: | 140 | Population of 85 year olds and over: | 42 | Population of Nonfamily Homes: | 2,482 | Population of 15 to 24 year olds: | 942 | Population of 25 to 34 year olds: | 464 | Population of 35 to 44 year olds: | 143 | Population of 45 to 54 year olds: | 239 | Population of 55 to 59 year olds: | 129 | Population of 60 to 64 year olds: | 131 | Population of 65 to 74 year olds: | 155 | Population of 75 to 84 year olds: | 158 | Population of 85 year olds and over: | 121 |
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| households in Clay County containing people over 60 | | Total Population: | 5,110 | Population of homes with one or more people 60 years and over: | 1,293 | 1-person household: | 529 | 2-or-more-person household: | 764 | Family households: | 721 | Nonfamily households: | 43 | Population of homes with no people 60 years and over: | 3,817 | 1-person household: | 1,129 | 2-or-more-person household: | 2,688 | Family homes: | 1,907 | Nonfamily homes: | 781 |
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| homes in Clay County with multiple generations. | | Total Population: | 5,110 | Home has three or more generations: | 36 | Home does not have three or more generations: | 5,074 |
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| Unmarried population in Clay County under 18 years old in homes | | Total Population: | 2,411 | Unmarried partner of home lead present: | 164 | In family homes: | 159 | Population of male led and male partner homes: | 1 | Population of male led and female partner households: | 64 | Population of female led and female partner households: | 2 | Population of female led and male partner households: | 92 | In nonfamily homes: | 5 | Population of male led and male partner homes: | 0 | Population of male led and female partner homes: | 4 | 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: | 2,247 | In family homes: | 2,244 | Population of husband-wife family homes: | 1,796 | Population of male lead with no wife present, family homes: | 111 | Population of female lead with no husband present, family homes: | 337 | In nonfamily homes: | 3 |
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| Population in families living in Clay County | | Total Population: | 7,656 | Population Under 18 years: | 2,378 | Population 18 years and over: | 5,278 |
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| How long in Clay County have lived in one place. | | Total: | 5,110 | Population of Owner occupied homes: | 2,709 | Family home: | 1,956 | Nonfamily homess: | 753 | Male led home: | 370 | Living alone: | 304 | Not living alone: | 66 | Female led home: | 383 | Living alone: | 321 | Not living alone: | 62 | Population of Renter occupied homes: | 2,401 | Family run homes: | 672 | Husband-wife family: | 356 | Other family: | 316 | Male led with no wife present: | 86 | Female led with no husband present: | 230 | Nonfamily Homes: | 1,729 | Male led homes: | 859 | Male living alone: | 509 | Male not living alone: | 350 | Female led homes: | 870 | Females living alone: | 524 | Females not living alone: | 346 |
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