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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