Population Demographics for Lake County, South Dakota in 2020, 2019
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| Total population in Lake County | | | Total Population: | 11,200 | | Male Population: | 5,693 | | Female Population: | 5,507 |
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| Median age in Lake County | | | Both sexes | 39 | | Male | 37 | | Female | 42 |
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| Population in households in Lake County | | | Total Population: | 10,326 | | Male Population: | 5,230 | | Under 5 years: | 309 | | 5 to 9 years: | 359 | | 10 to 14 years: | 337 | | 15 to 17 years: | 199 | | 18 and 19 years: | 114 | | 20 years: | 67 | | 21 years: | 91 | | 22 to 24 years: | 249 | | 25 to 29 years: | 307 | | 30 to 34 years: | 314 | | 35 to 39 years: | 257 | | 40 to 44 years: | 261 | | 45 to 49 years: | 363 | | 50 to 54 years: | 433 | | 55 to 59 years: | 426 | | 60 and 61 years: | 148 | | 62 to 64 years: | 173 | | 65 and 66 years: | 93 | | 67 to 69 years: | 153 | | 70 to 74 years: | 219 | | 75 to 79 years: | 152 | | 80 to 84 years: | 117 | | 85 years and over: | 89 | | Female Population: | 5,096 | | Under 5 years: | 307 | | 5 to 9 years: | 306 | | 10 to 14 years: | 319 | | 15 to 17 years: | 189 | | 18 and 19 years: | 89 | | 20 years: | 60 | | 21 years: | 75 | | 22 to 24 years: | 192 | | 25 to 29 years: | 281 | | 30 to 34 years: | 258 | | 35 to 39 years: | 252 | | 40 to 44 years: | 275 | | 45 to 49 years: | 379 | | 50 to 54 years: | 481 | | 55 to 59 years: | 384 | | 60 and 61 years: | 129 | | 62 to 64 years: | 174 | | 65 and 66 years: | 88 | | 67 to 69 years: | 140 | | 70 to 74 years: | 223 | | 75 to 79 years: | 184 | | 80 to 84 years: | 163 | | 85 years and over: | 148 |
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| Average household size in Lake County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Lake County | | | Total: | 4,483 | | Family led homes: | 2,814 | | Husband-wife family: | 2,374 | | Other family: | 440 | | Population of male led with no wife present: | 134 | | Population female led with no husband present: | 306 | | Population of Nonfamily homes: | 1,669 | | Population living alone: | 1,385 | | Population not living alone: | 284 |
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| Total occupied homes in Lake County with people under 18 years old: | | | Total: | 4,483 | | Population of homes with one or more people under 18 years: | 1,199 | | Population of family homes: | 1,187 | | Husband-wife family: | 878 | | Under 6 years only: | 205 | | Under 6 years and 6 to 17 years: | 216 | | 6 to 17 years only: | 457 | | Other family: | 309 | | Male householder, no wife present: | 90 | | Under 6 years only: | 25 | | Under 6 years and 6 to 17 years: | 22 | | 6 to 17 years only: | 43 | | Female led with no husband present: | 219 | | Under 6 years only: | 52 | | Under 6 years and 6 to 17 years: | 45 | | 6 to 17 years only: | 122 | | Nonfamily households: | 12 | | Male led households: | 9 | | Under 6 years only: | 2 | | Under 6 years and 6 to 17 years: | 1 | | 6 to 17 years only: | 6 | | Female led householder: | 3 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 1 | | 6 to 17 years only: | 2 | | Households with no people under 18 years: | 3,284 | | Family households: | 1,627 | | Husband-wife family: | 1,496 | | Other family: | 131 | | Male led with no wife present: | 44 | | Female led with no husband present: | 87 | | Nonfamily households: | 1,657 | | Male led householder: | 853 | | Female led householder: | 804 |
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| Total number led homes in Lake County, by type | | | Total Home Population: | 4,483 | | Population of Family homes: | 2,814 | | Population of 15 to 24 year olds: | 65 | | Population of 25 to 34 year olds: | 411 | | Population of 35 to 44 year olds: | 465 | | Population of 45 to 54 year olds: | 675 | | Population of 55 to 59 year olds: | 329 | | Population of 60 to 64 year olds: | 242 | | Population of 65 to 74 year olds: | 355 | | Population of 75 to 84 year olds: | 216 | | Population of 85 year olds and over: | 56 | | Population of Nonfamily Homes: | 1,669 | | Population of 15 to 24 year olds: | 261 | | Population of 25 to 34 year olds: | 209 | | Population of 35 to 44 year olds: | 106 | | Population of 45 to 54 year olds: | 251 | | Population of 55 to 59 year olds: | 154 | | Population of 60 to 64 year olds: | 124 | | Population of 65 to 74 year olds: | 196 | | Population of 75 to 84 year olds: | 217 | | Population of 85 year olds and over: | 151 |
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| households in Lake County containing people over 60 | | | Total Population: | 4,483 | | Population of homes with one or more people 60 years and over: | 1,619 | | 1-person household: | 652 | | 2-or-more-person household: | 967 | | Family households: | 922 | | Nonfamily households: | 45 | | Population of homes with no people 60 years and over: | 2,864 | | 1-person household: | 733 | | 2-or-more-person household: | 2,131 | | Family homes: | 1,892 | | Nonfamily homes: | 239 |
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| homes in Lake County with multiple generations. | | | Total Population: | 4,483 | | Home has three or more generations: | 48 | | Home does not have three or more generations: | 4,435 |
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| Unmarried population in Lake County under 18 years old in homes | | | Total Population: | 2,324 | | Unmarried partner of home lead present: | 148 | | In family homes: | 139 | | Population of male led and male partner homes: | 2 | | Population of male led and female partner households: | 65 | | Population of female led and female partner households: | 3 | | Population of female led and male partner households: | 69 | | In nonfamily homes: | 9 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 8 | | 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: | 2,176 | | In family homes: | 2,163 | | Population of husband-wife family homes: | 1,755 | | Population of male lead with no wife present, family homes: | 103 | | Population of female lead with no husband present, family homes: | 305 | | In nonfamily homes: | 13 |
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| Population in families living in Lake County | | | Total Population: | 8,091 | | Population Under 18 years: | 2,279 | | Population 18 years and over: | 5,812 |
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| How long in Lake County have lived in one place. | | | Total: | 4,483 | | Population of Owner occupied homes: | 3,191 | | Family home: | 2,342 | | Nonfamily homess: | 849 | | Male led home: | 428 | | Living alone: | 362 | | Not living alone: | 66 | | Female led home: | 421 | | Living alone: | 379 | | Not living alone: | 42 | | Population of Renter occupied homes: | 1,292 | | Family run homes: | 472 | | Husband-wife family: | 262 | | Other family: | 210 | | Male led with no wife present: | 65 | | Female led with no husband present: | 145 | | Nonfamily Homes: | 820 | | Male led homes: | 434 | | Male living alone: | 324 | | Male not living alone: | 110 | | Female led homes: | 386 | | Females living alone: | 320 | | Females not living alone: | 66 |
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