Population Demographics for Marion County, Iowa in 2020, 2019
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| Total population in Marion County | | | Total Population: | 33,309 | | Male Population: | 16,541 | | Female Population: | 16,768 |
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| Median age in Marion County | | | Both sexes | 39 | | Male | 37 | | Female | 40 |
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| Population in households in Marion County | | | Total Population: | 31,616 | | Male Population: | 15,755 | | Under 5 years: | 1,170 | | 5 to 9 years: | 1,202 | | 10 to 14 years: | 1,183 | | 15 to 17 years: | 786 | | 18 and 19 years: | 353 | | 20 years: | 134 | | 21 years: | 147 | | 22 to 24 years: | 471 | | 25 to 29 years: | 867 | | 30 to 34 years: | 908 | | 35 to 39 years: | 949 | | 40 to 44 years: | 995 | | 45 to 49 years: | 1,190 | | 50 to 54 years: | 1,231 | | 55 to 59 years: | 1,117 | | 60 and 61 years: | 366 | | 62 to 64 years: | 498 | | 65 and 66 years: | 307 | | 67 to 69 years: | 392 | | 70 to 74 years: | 537 | | 75 to 79 years: | 402 | | 80 to 84 years: | 327 | | 85 years and over: | 223 | | Female Population: | 15,861 | | Under 5 years: | 1,050 | | 5 to 9 years: | 1,084 | | 10 to 14 years: | 1,173 | | 15 to 17 years: | 713 | | 18 and 19 years: | 321 | | 20 years: | 105 | | 21 years: | 121 | | 22 to 24 years: | 431 | | 25 to 29 years: | 889 | | 30 to 34 years: | 890 | | 35 to 39 years: | 944 | | 40 to 44 years: | 1,017 | | 45 to 49 years: | 1,185 | | 50 to 54 years: | 1,203 | | 55 to 59 years: | 1,067 | | 60 and 61 years: | 359 | | 62 to 64 years: | 524 | | 65 and 66 years: | 290 | | 67 to 69 years: | 443 | | 70 to 74 years: | 615 | | 75 to 79 years: | 510 | | 80 to 84 years: | 437 | | 85 years and over: | 490 |
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| Average household size in Marion County | | | Total: | 2 | | Under 18 years: | 1 | | 18 years and over: | 2 |
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| Number of occupied homes in Marion County | | | Total: | 12,723 | | Family led homes: | 8,867 | | Husband-wife family: | 7,447 | | Other family: | 1,420 | | Population of male led with no wife present: | 446 | | Population female led with no husband present: | 974 | | Population of Nonfamily homes: | 3,856 | | Population living alone: | 3,354 | | Population not living alone: | 502 |
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| Total occupied homes in Marion County with people under 18 years old: | | | Total: | 12,723 | | Population of homes with one or more people under 18 years: | 4,169 | | Population of family homes: | 4,135 | | Husband-wife family: | 3,118 | | Under 6 years only: | 702 | | Under 6 years and 6 to 17 years: | 726 | | 6 to 17 years only: | 1,690 | | Other family: | 1,017 | | Male householder, no wife present: | 292 | | Under 6 years only: | 77 | | Under 6 years and 6 to 17 years: | 53 | | 6 to 17 years only: | 162 | | Female led with no husband present: | 725 | | Under 6 years only: | 189 | | Under 6 years and 6 to 17 years: | 114 | | 6 to 17 years only: | 422 | | Nonfamily households: | 34 | | Male led households: | 30 | | Under 6 years only: | 4 | | Under 6 years and 6 to 17 years: | 2 | | 6 to 17 years only: | 24 | | 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: | 8,554 | | Family households: | 4,732 | | Husband-wife family: | 4,329 | | Other family: | 403 | | Male led with no wife present: | 154 | | Female led with no husband present: | 249 | | Nonfamily households: | 3,822 | | Male led householder: | 1,804 | | Female led householder: | 2,018 |
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| Total number led homes in Marion County, by type | | | Total Home Population: | 12,723 | | Population of Family homes: | 8,867 | | Population of 15 to 24 year olds: | 252 | | Population of 25 to 34 year olds: | 1,342 | | Population of 35 to 44 year olds: | 1,771 | | Population of 45 to 54 year olds: | 2,066 | | Population of 55 to 59 year olds: | 887 | | Population of 60 to 64 year olds: | 732 | | Population of 65 to 74 year olds: | 1,064 | | Population of 75 to 84 year olds: | 606 | | Population of 85 year olds and over: | 147 | | Population of Nonfamily Homes: | 3,856 | | Population of 15 to 24 year olds: | 235 | | Population of 25 to 34 year olds: | 456 | | Population of 35 to 44 year olds: | 342 | | Population of 45 to 54 year olds: | 650 | | Population of 55 to 59 year olds: | 381 | | Population of 60 to 64 year olds: | 289 | | Population of 65 to 74 year olds: | 526 | | Population of 75 to 84 year olds: | 569 | | Population of 85 year olds and over: | 408 |
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| households in Marion County containing people over 60 | | | Total Population: | 12,723 | | Population of homes with one or more people 60 years and over: | 4,556 | | 1-person household: | 1,711 | | 2-or-more-person household: | 2,845 | | Family households: | 2,753 | | Nonfamily households: | 92 | | Population of homes with no people 60 years and over: | 8,167 | | 1-person household: | 1,643 | | 2-or-more-person household: | 6,524 | | Family homes: | 6,114 | | Nonfamily homes: | 410 |
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| homes in Marion County with multiple generations. | | | Total Population: | 12,723 | | Home has three or more generations: | 202 | | Home does not have three or more generations: | 12,521 |
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| Unmarried population in Marion County under 18 years old in homes | | | Total Population: | 8,354 | | Unmarried partner of home lead present: | 507 | | In family homes: | 472 | | Population of male led and male partner homes: | 26 | | Population of male led and female partner households: | 184 | | Population of female led and female partner households: | 17 | | Population of female led and male partner households: | 245 | | In nonfamily homes: | 35 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 32 | | Population of female led and female partner homes: | 2 | | Population of female led and male partner homes: | 1 | | No unmarried partner of home lead present: | 7,847 | | In family homes: | 7,831 | | Population of husband-wife family homes: | 6,552 | | Population of male lead with no wife present, family homes: | 300 | | Population of female lead with no husband present, family homes: | 979 | | In nonfamily homes: | 16 |
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| Population in families living in Marion County | | | Total Population: | 26,626 | | Population Under 18 years: | 8,248 | | Population 18 years and over: | 18,378 |
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| How long in Marion County have lived in one place. | | | Total: | 12,723 | | Population of Owner occupied homes: | 9,574 | | Family home: | 7,446 | | Nonfamily homess: | 2,128 | | Male led home: | 1,002 | | Living alone: | 839 | | Not living alone: | 163 | | Female led home: | 1,126 | | Living alone: | 1,013 | | Not living alone: | 113 | | Population of Renter occupied homes: | 3,149 | | Family run homes: | 1,421 | | Husband-wife family: | 795 | | Other family: | 626 | | Male led with no wife present: | 170 | | Female led with no husband present: | 456 | | Nonfamily Homes: | 1,728 | | Male led homes: | 832 | | Male living alone: | 681 | | Male not living alone: | 151 | | Female led homes: | 896 | | Females living alone: | 821 | | Females not living alone: | 75 |
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