Population Demographics for Rock County, Minnesota in 2020, 2019
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| Total population in Rock County | | | Total Population: | 9,687 | | Male Population: | 4,788 | | Female Population: | 4,899 |
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| Median age in Rock County | | | Both sexes | 41 | | Male | 39 | | Female | 43 |
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| Population in households in Rock County | | | Total Population: | 9,427 | | Male Population: | 4,633 | | Under 5 years: | 354 | | 5 to 9 years: | 357 | | 10 to 14 years: | 345 | | 15 to 17 years: | 210 | | 18 and 19 years: | 107 | | 20 years: | 32 | | 21 years: | 33 | | 22 to 24 years: | 135 | | 25 to 29 years: | 238 | | 30 to 34 years: | 278 | | 35 to 39 years: | 280 | | 40 to 44 years: | 259 | | 45 to 49 years: | 319 | | 50 to 54 years: | 353 | | 55 to 59 years: | 326 | | 60 and 61 years: | 137 | | 62 to 64 years: | 170 | | 65 and 66 years: | 101 | | 67 to 69 years: | 129 | | 70 to 74 years: | 146 | | 75 to 79 years: | 131 | | 80 to 84 years: | 109 | | 85 years and over: | 84 | | Female Population: | 4,794 | | Under 5 years: | 328 | | 5 to 9 years: | 356 | | 10 to 14 years: | 319 | | 15 to 17 years: | 210 | | 18 and 19 years: | 92 | | 20 years: | 31 | | 21 years: | 39 | | 22 to 24 years: | 111 | | 25 to 29 years: | 263 | | 30 to 34 years: | 269 | | 35 to 39 years: | 275 | | 40 to 44 years: | 243 | | 45 to 49 years: | 345 | | 50 to 54 years: | 354 | | 55 to 59 years: | 323 | | 60 and 61 years: | 111 | | 62 to 64 years: | 171 | | 65 and 66 years: | 82 | | 67 to 69 years: | 129 | | 70 to 74 years: | 191 | | 75 to 79 years: | 177 | | 80 to 84 years: | 185 | | 85 years and over: | 190 |
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| Average household size in Rock County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Rock County | | | Total: | 3,918 | | Family led homes: | 2,666 | | Husband-wife family: | 2,257 | | Other family: | 409 | | Population of male led with no wife present: | 141 | | Population female led with no husband present: | 268 | | Population of Nonfamily homes: | 1,252 | | Population living alone: | 1,140 | | Population not living alone: | 112 |
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| Total occupied homes in Rock County with people under 18 years old: | | | Total: | 3,918 | | Population of homes with one or more people under 18 years: | 1,200 | | Population of family homes: | 1,192 | | Husband-wife family: | 904 | | Under 6 years only: | 204 | | Under 6 years and 6 to 17 years: | 228 | | 6 to 17 years only: | 472 | | Other family: | 288 | | Male householder, no wife present: | 93 | | Under 6 years only: | 26 | | Under 6 years and 6 to 17 years: | 19 | | 6 to 17 years only: | 48 | | Female led with no husband present: | 195 | | Under 6 years only: | 46 | | Under 6 years and 6 to 17 years: | 41 | | 6 to 17 years only: | 108 | | Nonfamily households: | 8 | | Male led households: | 7 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 1 | | 6 to 17 years only: | 6 | | Female led householder: | 1 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 1 | | Households with no people under 18 years: | 2,718 | | Family households: | 1,474 | | Husband-wife family: | 1,353 | | Other family: | 121 | | Male led with no wife present: | 48 | | Female led with no husband present: | 73 | | Nonfamily households: | 1,244 | | Male led householder: | 533 | | Female led householder: | 711 |
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| Total number led homes in Rock County, by type | | | Total Home Population: | 3,918 | | Population of Family homes: | 2,666 | | Population of 15 to 24 year olds: | 65 | | Population of 25 to 34 year olds: | 414 | | Population of 35 to 44 year olds: | 495 | | Population of 45 to 54 year olds: | 586 | | Population of 55 to 59 year olds: | 268 | | Population of 60 to 64 year olds: | 259 | | Population of 65 to 74 year olds: | 310 | | Population of 75 to 84 year olds: | 207 | | Population of 85 year olds and over: | 62 | | Population of Nonfamily Homes: | 1,252 | | Population of 15 to 24 year olds: | 96 | | Population of 25 to 34 year olds: | 108 | | Population of 35 to 44 year olds: | 81 | | Population of 45 to 54 year olds: | 177 | | Population of 55 to 59 year olds: | 113 | | Population of 60 to 64 year olds: | 92 | | Population of 65 to 74 year olds: | 172 | | Population of 75 to 84 year olds: | 230 | | Population of 85 year olds and over: | 183 |
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| households in Rock County containing people over 60 | | | Total Population: | 3,918 | | Population of homes with one or more people 60 years and over: | 1,562 | | 1-person household: | 656 | | 2-or-more-person household: | 906 | | Family households: | 883 | | Nonfamily households: | 23 | | Population of homes with no people 60 years and over: | 2,356 | | 1-person household: | 484 | | 2-or-more-person household: | 1,872 | | Family homes: | 1,783 | | Nonfamily homes: | 89 |
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| homes in Rock County with multiple generations. | | | Total Population: | 3,918 | | Home has three or more generations: | 41 | | Home does not have three or more generations: | 3,877 |
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| Unmarried population in Rock County under 18 years old in homes | | | Total Population: | 2,478 | | Unmarried partner of home lead present: | 161 | | In family homes: | 151 | | Population of male led and male partner homes: | 1 | | Population of male led and female partner households: | 70 | | Population of female led and female partner households: | 2 | | Population of female led and male partner households: | 78 | | In nonfamily homes: | 10 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 10 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 0 | | No unmarried partner of home lead present: | 2,317 | | In family homes: | 2,312 | | Population of husband-wife family homes: | 1,955 | | Population of male lead with no wife present, family homes: | 83 | | Population of female lead with no husband present, family homes: | 274 | | In nonfamily homes: | 5 |
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| Population in families living in Rock County | | | Total Population: | 7,886 | | Population Under 18 years: | 2,446 | | Population 18 years and over: | 5,440 |
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| How long in Rock County have lived in one place. | | | Total: | 3,918 | | Population of Owner occupied homes: | 3,031 | | Family home: | 2,306 | | Nonfamily homess: | 725 | | Male led home: | 328 | | Living alone: | 291 | | Not living alone: | 37 | | Female led home: | 397 | | Living alone: | 374 | | Not living alone: | 23 | | Population of Renter occupied homes: | 887 | | Family run homes: | 360 | | Husband-wife family: | 199 | | Other family: | 161 | | Male led with no wife present: | 47 | | Female led with no husband present: | 114 | | Nonfamily Homes: | 527 | | Male led homes: | 212 | | Male living alone: | 177 | | Male not living alone: | 35 | | Female led homes: | 315 | | Females living alone: | 298 | | Females not living alone: | 17 |
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