Population Demographics for Johnson County, Iowa in 2020, 2019
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| | Male | Female | Total | | Total Population | 65,462 | 65,420 | 130,882 | | White | 56,041 | 56,042 | 112,083 | | Asian | 3,249 | 3,570 | 6,819 | | Black or African American | 3,209 | 3,096 | 6,305 | | Hispanic or Latino | 3,205 | 2,995 | 6,200 | | Two or More Races | 1,483 | 1,482 | 2,965 | | Some Other Race | 1,284 | 1,088 | 2,372 | | American Indian | 170 | 117 | 287 | | Three or more races | 94 | 103 | 197 |
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| Total population in Johnson County | | | Total Population: | 130,882 | | Male Population: | 65,462 | | Female Population: | 65,420 |
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| Median age in Johnson County | | | Both sexes | 29 | | Male | 29 | | Female | 30 |
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| Population in households in Johnson County | | | Total Population: | 123,025 | | Male Population: | 61,434 | | Under 5 years: | 4,161 | | 5 to 9 years: | 3,687 | | 10 to 14 years: | 3,430 | | 15 to 17 years: | 1,977 | | 18 and 19 years: | 1,530 | | 20 years: | 1,952 | | 21 years: | 2,275 | | 22 to 24 years: | 5,525 | | 25 to 29 years: | 6,509 | | 30 to 34 years: | 4,814 | | 35 to 39 years: | 3,818 | | 40 to 44 years: | 3,591 | | 45 to 49 years: | 3,551 | | 50 to 54 years: | 3,656 | | 55 to 59 years: | 3,482 | | 60 and 61 years: | 1,230 | | 62 to 64 years: | 1,550 | | 65 and 66 years: | 765 | | 67 to 69 years: | 952 | | 70 to 74 years: | 1,141 | | 75 to 79 years: | 829 | | 80 to 84 years: | 549 | | 85 years and over: | 460 | | Female Population: | 61,591 | | Under 5 years: | 3,905 | | 5 to 9 years: | 3,597 | | 10 to 14 years: | 3,277 | | 15 to 17 years: | 1,839 | | 18 and 19 years: | 1,443 | | 20 years: | 1,857 | | 21 years: | 2,279 | | 22 to 24 years: | 5,137 | | 25 to 29 years: | 6,225 | | 30 to 34 years: | 4,503 | | 35 to 39 years: | 3,653 | | 40 to 44 years: | 3,598 | | 45 to 49 years: | 3,748 | | 50 to 54 years: | 3,891 | | 55 to 59 years: | 3,746 | | 60 and 61 years: | 1,286 | | 62 to 64 years: | 1,575 | | 65 and 66 years: | 818 | | 67 to 69 years: | 1,036 | | 70 to 74 years: | 1,327 | | 75 to 79 years: | 1,046 | | 80 to 84 years: | 902 | | 85 years and over: | 903 |
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| Average household size in Johnson County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 2 |
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| Number of occupied homes in Johnson County | | | Total: | 52,715 | | Family led homes: | 27,883 | | Husband-wife family: | 22,279 | | Other family: | 5,604 | | Population of male led with no wife present: | 1,614 | | Population female led with no husband present: | 3,990 | | Population of Nonfamily homes: | 24,832 | | Population living alone: | 15,961 | | Population not living alone: | 8,871 |
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| Total occupied homes in Johnson County with people under 18 years old: | | | Total: | 52,715 | | Population of homes with one or more people under 18 years: | 13,740 | | Population of family homes: | 13,612 | | Husband-wife family: | 10,078 | | Under 6 years only: | 3,143 | | Under 6 years and 6 to 17 years: | 2,107 | | 6 to 17 years only: | 4,828 | | Other family: | 3,534 | | Male householder, no wife present: | 870 | | Under 6 years only: | 260 | | Under 6 years and 6 to 17 years: | 146 | | 6 to 17 years only: | 464 | | Female led with no husband present: | 2,664 | | Under 6 years only: | 660 | | Under 6 years and 6 to 17 years: | 514 | | 6 to 17 years only: | 1,490 | | Nonfamily households: | 128 | | Male led households: | 89 | | Under 6 years only: | 25 | | Under 6 years and 6 to 17 years: | 8 | | 6 to 17 years only: | 56 | | Female led householder: | 39 | | Under 6 years only: | 15 | | Under 6 years and 6 to 17 years: | 2 | | 6 to 17 years only: | 22 | | Households with no people under 18 years: | 38,975 | | Family households: | 14,271 | | Husband-wife family: | 12,201 | | Other family: | 2,070 | | Male led with no wife present: | 744 | | Female led with no husband present: | 1,326 | | Nonfamily households: | 24,704 | | Male led householder: | 12,132 | | Female led householder: | 12,572 |
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| Total number led homes in Johnson County, by type | | | Total Home Population: | 52,715 | | Population of Family homes: | 27,883 | | Population of 15 to 24 year olds: | 1,203 | | Population of 25 to 34 year olds: | 6,021 | | Population of 35 to 44 year olds: | 5,972 | | Population of 45 to 54 year olds: | 5,940 | | Population of 55 to 59 year olds: | 2,718 | | Population of 60 to 64 year olds: | 2,205 | | Population of 65 to 74 year olds: | 2,364 | | Population of 75 to 84 year olds: | 1,130 | | Population of 85 year olds and over: | 330 | | Population of Nonfamily Homes: | 24,832 | | Population of 15 to 24 year olds: | 7,164 | | Population of 25 to 34 year olds: | 6,080 | | Population of 35 to 44 year olds: | 2,334 | | Population of 45 to 54 year olds: | 2,839 | | Population of 55 to 59 year olds: | 1,695 | | Population of 60 to 64 year olds: | 1,292 | | Population of 65 to 74 year olds: | 1,434 | | Population of 75 to 84 year olds: | 1,250 | | Population of 85 year olds and over: | 744 |
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| households in Johnson County containing people over 60 | | | Total Population: | 52,715 | | Population of homes with one or more people 60 years and over: | 11,615 | | 1-person household: | 4,381 | | 2-or-more-person household: | 7,234 | | Family households: | 6,794 | | Nonfamily households: | 440 | | Population of homes with no people 60 years and over: | 41,100 | | 1-person household: | 11,580 | | 2-or-more-person household: | 29,520 | | Family homes: | 21,089 | | Nonfamily homes: | 8,431 |
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| homes in Johnson County with multiple generations. | | | Total Population: | 52,715 | | Home has three or more generations: | 589 | | Home does not have three or more generations: | 52,126 |
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| Unmarried population in Johnson County under 18 years old in homes | | | Total Population: | 25,854 | | Unmarried partner of home lead present: | 1,702 | | In family homes: | 1,602 | | Population of male led and male partner homes: | 47 | | Population of male led and female partner households: | 602 | | Population of female led and female partner households: | 152 | | Population of female led and male partner households: | 801 | | In nonfamily homes: | 100 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 84 | | Population of female led and female partner homes: | 4 | | Population of female led and male partner homes: | 12 | | No unmarried partner of home lead present: | 24,152 | | In family homes: | 24,087 | | Population of husband-wife family homes: | 19,443 | | Population of male lead with no wife present, family homes: | 789 | | Population of female lead with no husband present, family homes: | 3,855 | | In nonfamily homes: | 65 |
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| Population in families living in Johnson County | | | Total Population: | 82,637 | | Population Under 18 years: | 25,543 | | Population 18 years and over: | 57,094 |
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| How long in Johnson County have lived in one place. | | | Total: | 52,715 | | Population of Owner occupied homes: | 31,299 | | Family home: | 21,932 | | Nonfamily homess: | 9,367 | | Male led home: | 4,167 | | Living alone: | 3,006 | | Not living alone: | 1,161 | | Female led home: | 5,200 | | Living alone: | 4,256 | | Not living alone: | 944 | | Population of Renter occupied homes: | 21,416 | | Family run homes: | 5,951 | | Husband-wife family: | 3,259 | | Other family: | 2,692 | | Male led with no wife present: | 747 | | Female led with no husband present: | 1,945 | | Nonfamily Homes: | 15,465 | | Male led homes: | 8,054 | | Male living alone: | 4,490 | | Male not living alone: | 3,564 | | Female led homes: | 7,411 | | Females living alone: | 4,209 | | Females not living alone: | 3,202 |
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