Population Demographics for Louisa County, Iowa in 2020, 2019
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| Total population in Louisa County | | | Total Population: | 11,387 | | Male Population: | 5,793 | | Female Population: | 5,594 |
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| Median age in Louisa County | | | Both sexes | 40 | | Male | 39 | | Female | 41 |
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| Population in households in Louisa County | | | Total Population: | 11,271 | | Male Population: | 5,760 | | Under 5 years: | 333 | | 5 to 9 years: | 437 | | 10 to 14 years: | 482 | | 15 to 17 years: | 286 | | 18 and 19 years: | 146 | | 20 years: | 66 | | 21 years: | 63 | | 22 to 24 years: | 146 | | 25 to 29 years: | 353 | | 30 to 34 years: | 332 | | 35 to 39 years: | 339 | | 40 to 44 years: | 389 | | 45 to 49 years: | 479 | | 50 to 54 years: | 455 | | 55 to 59 years: | 395 | | 60 and 61 years: | 146 | | 62 to 64 years: | 184 | | 65 and 66 years: | 104 | | 67 to 69 years: | 133 | | 70 to 74 years: | 196 | | 75 to 79 years: | 130 | | 80 to 84 years: | 108 | | 85 years and over: | 58 | | Female Population: | 5,511 | | Under 5 years: | 339 | | 5 to 9 years: | 374 | | 10 to 14 years: | 416 | | 15 to 17 years: | 276 | | 18 and 19 years: | 112 | | 20 years: | 65 | | 21 years: | 46 | | 22 to 24 years: | 149 | | 25 to 29 years: | 306 | | 30 to 34 years: | 330 | | 35 to 39 years: | 316 | | 40 to 44 years: | 361 | | 45 to 49 years: | 465 | | 50 to 54 years: | 407 | | 55 to 59 years: | 381 | | 60 and 61 years: | 120 | | 62 to 64 years: | 174 | | 65 and 66 years: | 103 | | 67 to 69 years: | 145 | | 70 to 74 years: | 209 | | 75 to 79 years: | 162 | | 80 to 84 years: | 154 | | 85 years and over: | 101 |
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| Average household size in Louisa County | | | Total: | 3 | | Under 18 years: | 1 | | 18 years and over: | 2 |
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| Number of occupied homes in Louisa County | | | Total: | 4,346 | | Family led homes: | 3,066 | | Husband-wife family: | 2,430 | | Other family: | 636 | | Population of male led with no wife present: | 227 | | Population female led with no husband present: | 409 | | Population of Nonfamily homes: | 1,280 | | Population living alone: | 1,069 | | Population not living alone: | 211 |
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| Total occupied homes in Louisa County with people under 18 years old: | | | Total: | 4,346 | | Population of homes with one or more people under 18 years: | 1,459 | | Population of family homes: | 1,448 | | Husband-wife family: | 1,004 | | Under 6 years only: | 173 | | Under 6 years and 6 to 17 years: | 243 | | 6 to 17 years only: | 588 | | Other family: | 444 | | Male householder, no wife present: | 157 | | Under 6 years only: | 31 | | Under 6 years and 6 to 17 years: | 35 | | 6 to 17 years only: | 91 | | Female led with no husband present: | 287 | | Under 6 years only: | 49 | | Under 6 years and 6 to 17 years: | 70 | | 6 to 17 years only: | 168 | | Nonfamily households: | 11 | | Male led households: | 8 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 8 | | 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: | 2,887 | | Family households: | 1,618 | | Husband-wife family: | 1,426 | | Other family: | 192 | | Male led with no wife present: | 70 | | Female led with no husband present: | 122 | | Nonfamily households: | 1,269 | | Male led householder: | 690 | | Female led householder: | 579 |
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| Total number led homes in Louisa County, by type | | | Total Home Population: | 4,346 | | Population of Family homes: | 3,066 | | Population of 15 to 24 year olds: | 75 | | Population of 25 to 34 year olds: | 477 | | Population of 35 to 44 year olds: | 595 | | Population of 45 to 54 year olds: | 740 | | Population of 55 to 59 year olds: | 326 | | Population of 60 to 64 year olds: | 262 | | Population of 65 to 74 year olds: | 360 | | Population of 75 to 84 year olds: | 192 | | Population of 85 year olds and over: | 39 | | Population of Nonfamily Homes: | 1,280 | | Population of 15 to 24 year olds: | 52 | | Population of 25 to 34 year olds: | 124 | | Population of 35 to 44 year olds: | 123 | | Population of 45 to 54 year olds: | 251 | | Population of 55 to 59 year olds: | 117 | | Population of 60 to 64 year olds: | 127 | | Population of 65 to 74 year olds: | 200 | | Population of 75 to 84 year olds: | 199 | | Population of 85 year olds and over: | 87 |
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| households in Louisa County containing people over 60 | | | Total Population: | 4,346 | | Population of homes with one or more people 60 years and over: | 1,588 | | 1-person household: | 581 | | 2-or-more-person household: | 1,007 | | Family households: | 965 | | Nonfamily households: | 42 | | Population of homes with no people 60 years and over: | 2,758 | | 1-person household: | 488 | | 2-or-more-person household: | 2,270 | | Family homes: | 2,101 | | Nonfamily homes: | 169 |
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| homes in Louisa County with multiple generations. | | | Total Population: | 4,346 | | Home has three or more generations: | 160 | | Home does not have three or more generations: | 4,186 |
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| Unmarried population in Louisa County under 18 years old in homes | | | Total Population: | 2,938 | | Unmarried partner of home lead present: | 338 | | In family homes: | 330 | | Population of male led and male partner homes: | 6 | | Population of male led and female partner households: | 162 | | Population of female led and female partner households: | 9 | | Population of female led and male partner households: | 153 | | In nonfamily homes: | 8 | | 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: | 0 | | No unmarried partner of home lead present: | 2,600 | | In family homes: | 2,594 | | Population of husband-wife family homes: | 2,052 | | Population of male lead with no wife present, family homes: | 141 | | Population of female lead with no husband present, family homes: | 401 | | In nonfamily homes: | 6 |
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| Population in families living in Louisa County | | | Total Population: | 9,403 | | Population Under 18 years: | 2,880 | | Population 18 years and over: | 6,523 |
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| How long in Louisa County have lived in one place. | | | Total: | 4,346 | | Population of Owner occupied homes: | 3,416 | | Family home: | 2,577 | | Nonfamily homess: | 839 | | Male led home: | 443 | | Living alone: | 355 | | Not living alone: | 88 | | Female led home: | 396 | | Living alone: | 354 | | Not living alone: | 42 | | Population of Renter occupied homes: | 930 | | Family run homes: | 489 | | Husband-wife family: | 288 | | Other family: | 201 | | Male led with no wife present: | 74 | | Female led with no husband present: | 127 | | Nonfamily Homes: | 441 | | Male led homes: | 255 | | Male living alone: | 199 | | Male not living alone: | 56 | | Female led homes: | 186 | | Females living alone: | 161 | | Females not living alone: | 25 |
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