Population Demographics for Polk County, Iowa in 2020, 2019
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| | Male | Female | Total | | Total Population | 211,171 | 219,469 | 430,640 | | White | 177,914 | 186,981 | 364,895 | | Hispanic or Latino | 17,131 | 15,516 | 32,647 | | Black or African American | 13,093 | 12,760 | 25,853 | | Asian | 7,461 | 7,759 | 15,220 | | Some Other Race | 6,712 | 5,917 | 12,629 | | Two or More Races | 5,184 | 5,221 | 10,405 | | American Indian | 685 | 699 | 1,384 | | Three or more races | 299 | 357 | 656 | | Native Hawaiian Pacific Islander | 122 | 132 | 254 |
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| Total population in Polk County | | | Total Population: | 430,640 | | Male Population: | 211,171 | | Female Population: | 219,469 |
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| Median age in Polk County | | | Both sexes | 35 | | Male | 34 | | Female | 36 |
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| Population in households in Polk County | | | Total Population: | 421,284 | | Male Population: | 206,659 | | Under 5 years: | 16,735 | | 5 to 9 years: | 15,768 | | 10 to 14 years: | 15,149 | | 15 to 17 years: | 8,519 | | 18 and 19 years: | 4,727 | | 20 years: | 2,365 | | 21 years: | 2,228 | | 22 to 24 years: | 8,446 | | 25 to 29 years: | 17,124 | | 30 to 34 years: | 15,900 | | 35 to 39 years: | 14,661 | | 40 to 44 years: | 14,731 | | 45 to 49 years: | 15,064 | | 50 to 54 years: | 14,070 | | 55 to 59 years: | 12,308 | | 60 and 61 years: | 4,309 | | 62 to 64 years: | 5,643 | | 65 and 66 years: | 2,778 | | 67 to 69 years: | 3,818 | | 70 to 74 years: | 4,568 | | 75 to 79 years: | 3,440 | | 80 to 84 years: | 2,533 | | 85 years and over: | 1,775 | | Female Population: | 214,625 | | Under 5 years: | 15,989 | | 5 to 9 years: | 15,023 | | 10 to 14 years: | 14,145 | | 15 to 17 years: | 8,100 | | 18 and 19 years: | 4,572 | | 20 years: | 2,305 | | 21 years: | 2,366 | | 22 to 24 years: | 9,169 | | 25 to 29 years: | 17,597 | | 30 to 34 years: | 15,885 | | 35 to 39 years: | 14,530 | | 40 to 44 years: | 14,726 | | 45 to 49 years: | 15,333 | | 50 to 54 years: | 14,922 | | 55 to 59 years: | 13,251 | | 60 and 61 years: | 4,803 | | 62 to 64 years: | 6,179 | | 65 and 66 years: | 3,298 | | 67 to 69 years: | 4,329 | | 70 to 74 years: | 5,670 | | 75 to 79 years: | 4,645 | | 80 to 84 years: | 3,865 | | 85 years and over: | 3,923 |
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| Average household size in Polk County | | | Total: | 2 | | Under 18 years: | 1 | | 18 years and over: | 2 |
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| Number of occupied homes in Polk County | | | Total: | 170,197 | | Family led homes: | 108,321 | | Husband-wife family: | 82,125 | | Other family: | 26,196 | | Population of male led with no wife present: | 7,420 | | Population female led with no husband present: | 18,776 | | Population of Nonfamily homes: | 61,876 | | Population living alone: | 48,127 | | Population not living alone: | 13,749 |
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| Total occupied homes in Polk County with people under 18 years old: | | | Total: | 170,197 | | Population of homes with one or more people under 18 years: | 57,326 | | Population of family homes: | 56,767 | | Husband-wife family: | 38,892 | | Under 6 years only: | 10,585 | | Under 6 years and 6 to 17 years: | 9,003 | | 6 to 17 years only: | 19,304 | | Other family: | 17,875 | | Male householder, no wife present: | 4,673 | | Under 6 years only: | 1,452 | | Under 6 years and 6 to 17 years: | 878 | | 6 to 17 years only: | 2,343 | | Female led with no husband present: | 13,202 | | Under 6 years only: | 3,275 | | Under 6 years and 6 to 17 years: | 2,753 | | 6 to 17 years only: | 7,174 | | Nonfamily households: | 559 | | Male led households: | 429 | | Under 6 years only: | 118 | | Under 6 years and 6 to 17 years: | 43 | | 6 to 17 years only: | 268 | | Female led householder: | 130 | | Under 6 years only: | 35 | | Under 6 years and 6 to 17 years: | 8 | | 6 to 17 years only: | 87 | | Households with no people under 18 years: | 112,871 | | Family households: | 51,554 | | Husband-wife family: | 43,233 | | Other family: | 8,321 | | Male led with no wife present: | 2,747 | | Female led with no husband present: | 5,574 | | Nonfamily households: | 61,317 | | Male led householder: | 28,228 | | Female led householder: | 33,089 |
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| Total number led homes in Polk County, by type | | | Total Home Population: | 170,197 | | Population of Family homes: | 108,321 | | Population of 15 to 24 year olds: | 3,812 | | Population of 25 to 34 year olds: | 21,647 | | Population of 35 to 44 year olds: | 25,095 | | Population of 45 to 54 year olds: | 23,859 | | Population of 55 to 59 year olds: | 9,824 | | Population of 60 to 64 year olds: | 8,132 | | Population of 65 to 74 year olds: | 9,551 | | Population of 75 to 84 year olds: | 5,115 | | Population of 85 year olds and over: | 1,286 | | Population of Nonfamily Homes: | 61,876 | | Population of 15 to 24 year olds: | 6,245 | | Population of 25 to 34 year olds: | 12,379 | | Population of 35 to 44 year olds: | 7,467 | | Population of 45 to 54 year olds: | 10,492 | | Population of 55 to 59 year olds: | 5,582 | | Population of 60 to 64 year olds: | 4,809 | | Population of 65 to 74 year olds: | 6,316 | | Population of 75 to 84 year olds: | 5,274 | | Population of 85 year olds and over: | 3,312 |
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| households in Polk County containing people over 60 | | | Total Population: | 170,197 | | Population of homes with one or more people 60 years and over: | 47,503 | | 1-person household: | 18,480 | | 2-or-more-person household: | 29,023 | | Family households: | 27,474 | | Nonfamily households: | 1,549 | | Population of homes with no people 60 years and over: | 122,694 | | 1-person household: | 29,647 | | 2-or-more-person household: | 93,047 | | Family homes: | 80,847 | | Nonfamily homes: | 12,200 |
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| homes in Polk County with multiple generations. | | | Total Population: | 170,197 | | Home has three or more generations: | 4,441 | | Home does not have three or more generations: | 165,756 |
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| Unmarried population in Polk County under 18 years old in homes | | | Total Population: | 109,353 | | Unmarried partner of home lead present: | 9,305 | | In family homes: | 8,787 | | Population of male led and male partner homes: | 237 | | Population of male led and female partner households: | 3,719 | | Population of female led and female partner households: | 357 | | Population of female led and male partner households: | 4,474 | | In nonfamily homes: | 518 | | Population of male led and male partner homes: | 1 | | Population of male led and female partner homes: | 451 | | Population of female led and female partner homes: | 15 | | Population of female led and male partner homes: | 51 | | No unmarried partner of home lead present: | 100,048 | | In family homes: | 99,815 | | Population of husband-wife family homes: | 76,446 | | Population of male lead with no wife present, family homes: | 4,098 | | Population of female lead with no husband present, family homes: | 19,271 | | In nonfamily homes: | 233 |
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| Population in families living in Polk County | | | Total Population: | 332,839 | | Population Under 18 years: | 107,765 | | Population 18 years and over: | 225,074 |
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| How long in Polk County have lived in one place. | | | Total: | 170,197 | | Population of Owner occupied homes: | 117,531 | | Family home: | 85,574 | | Nonfamily homess: | 31,957 | | Male led home: | 13,833 | | Living alone: | 10,140 | | Not living alone: | 3,693 | | Female led home: | 18,124 | | Living alone: | 15,412 | | Not living alone: | 2,712 | | Population of Renter occupied homes: | 52,666 | | Family run homes: | 22,747 | | Husband-wife family: | 10,681 | | Other family: | 12,066 | | Male led with no wife present: | 3,079 | | Female led with no husband present: | 8,987 | | Nonfamily Homes: | 29,919 | | Male led homes: | 14,824 | | Male living alone: | 10,770 | | Male not living alone: | 4,054 | | Female led homes: | 15,095 | | Females living alone: | 11,805 | | Females not living alone: | 3,290 |
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