Population Demographics for Johnson County, Kansas in 2020, 2019
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| | Male | Female | Total | Total Population | 265,733 | 278,446 | 544,179 | White | 227,656 | 240,396 | 468,052 | Hispanic or Latino | 20,106 | 18,843 | 38,949 | Black or African American | 11,810 | 11,826 | 23,636 | Asian | 10,972 | 11,771 | 22,743 | Some Other Race | 7,373 | 6,424 | 13,797 | Two or More Races | 6,799 | 6,839 | 13,638 | American Indian | 966 | 1,048 | 2,014 | Three or more races | 448 | 475 | 923 | Native Hawaiian Pacific Islander | 157 | 142 | 299 |
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| Total population in Johnson County | | Total Population: | 544,179 | Male Population: | 265,733 | Female Population: | 278,446 |
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| Median age in Johnson County | | Both sexes | 36 | Male | 35 | Female | 38 |
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| Population in households in Johnson County | | Total Population: | 539,013 | Male Population: | 263,426 | Under 5 years: | 20,105 | 5 to 9 years: | 20,902 | 10 to 14 years: | 20,473 | 15 to 17 years: | 11,959 | 18 and 19 years: | 5,705 | 20 years: | 2,205 | 21 years: | 2,155 | 22 to 24 years: | 8,992 | 25 to 29 years: | 19,562 | 30 to 34 years: | 19,129 | 35 to 39 years: | 19,208 | 40 to 44 years: | 19,223 | 45 to 49 years: | 20,400 | 50 to 54 years: | 18,802 | 55 to 59 years: | 16,507 | 60 and 61 years: | 5,795 | 62 to 64 years: | 7,833 | 65 and 66 years: | 3,801 | 67 to 69 years: | 4,759 | 70 to 74 years: | 5,740 | 75 to 79 years: | 4,257 | 80 to 84 years: | 3,155 | 85 years and over: | 2,759 | Female Population: | 275,587 | Under 5 years: | 19,044 | 5 to 9 years: | 19,817 | 10 to 14 years: | 19,510 | 15 to 17 years: | 11,344 | 18 and 19 years: | 5,009 | 20 years: | 2,079 | 21 years: | 2,134 | 22 to 24 years: | 9,740 | 25 to 29 years: | 20,300 | 30 to 34 years: | 19,766 | 35 to 39 years: | 19,521 | 40 to 44 years: | 19,735 | 45 to 49 years: | 21,609 | 50 to 54 years: | 20,681 | 55 to 59 years: | 18,440 | 60 and 61 years: | 6,259 | 62 to 64 years: | 8,397 | 65 and 66 years: | 4,296 | 67 to 69 years: | 5,450 | 70 to 74 years: | 6,788 | 75 to 79 years: | 5,663 | 80 to 84 years: | 4,912 | 85 years and over: | 5,093 |
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| Average household size in Johnson County | | Total: | 3 | Under 18 years: | 1 | 18 years and over: | 2 |
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| Number of occupied homes in Johnson County | | Total: | 212,882 | Family led homes: | 145,262 | Husband-wife family: | 119,130 | Other family: | 26,132 | Population of male led with no wife present: | 7,516 | Population female led with no husband present: | 18,616 | Population of Nonfamily homes: | 67,620 | Population living alone: | 54,888 | Population not living alone: | 12,732 |
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| Total occupied homes in Johnson County with people under 18 years old: | | Total: | 212,882 | Population of homes with one or more people under 18 years: | 76,114 | Population of family homes: | 75,541 | Husband-wife family: | 58,368 | Under 6 years only: | 15,107 | Under 6 years and 6 to 17 years: | 12,452 | 6 to 17 years only: | 30,809 | Other family: | 17,173 | Male householder, no wife present: | 4,617 | Under 6 years only: | 1,222 | Under 6 years and 6 to 17 years: | 657 | 6 to 17 years only: | 2,738 | Female led with no husband present: | 12,556 | Under 6 years only: | 2,586 | Under 6 years and 6 to 17 years: | 1,928 | 6 to 17 years only: | 8,042 | Nonfamily households: | 573 | Male led households: | 430 | Under 6 years only: | 105 | Under 6 years and 6 to 17 years: | 37 | 6 to 17 years only: | 288 | Female led householder: | 143 | Under 6 years only: | 33 | Under 6 years and 6 to 17 years: | 11 | 6 to 17 years only: | 99 | Households with no people under 18 years: | 136,768 | Family households: | 69,721 | Husband-wife family: | 60,762 | Other family: | 8,959 | Male led with no wife present: | 2,899 | Female led with no husband present: | 6,060 | Nonfamily households: | 67,047 | Male led householder: | 29,229 | Female led householder: | 37,818 |
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| Total number led homes in Johnson County, by type | | Total Home Population: | 212,882 | Population of Family homes: | 145,262 | Population of 15 to 24 year olds: | 3,101 | Population of 25 to 34 year olds: | 24,721 | Population of 35 to 44 year olds: | 34,423 | Population of 45 to 54 year olds: | 35,707 | Population of 55 to 59 year olds: | 14,523 | Population of 60 to 64 year olds: | 11,810 | Population of 65 to 74 year olds: | 12,699 | Population of 75 to 84 year olds: | 6,335 | Population of 85 year olds and over: | 1,943 | Population of Nonfamily Homes: | 67,620 | Population of 15 to 24 year olds: | 5,511 | Population of 25 to 34 year olds: | 14,672 | Population of 35 to 44 year olds: | 8,333 | Population of 45 to 54 year olds: | 10,904 | Population of 55 to 59 year olds: | 6,040 | Population of 60 to 64 year olds: | 5,309 | Population of 65 to 74 year olds: | 6,707 | Population of 75 to 84 year olds: | 5,993 | Population of 85 year olds and over: | 4,151 |
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| households in Johnson County containing people over 60 | | Total Population: | 212,882 | Population of homes with one or more people 60 years and over: | 59,712 | 1-person household: | 20,974 | 2-or-more-person household: | 38,738 | Family households: | 37,270 | Nonfamily households: | 1,468 | Population of homes with no people 60 years and over: | 153,170 | 1-person household: | 33,914 | 2-or-more-person household: | 119,256 | Family homes: | 107,992 | Nonfamily homes: | 11,264 |
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| homes in Johnson County with multiple generations. | | Total Population: | 212,882 | Home has three or more generations: | 4,625 | Home does not have three or more generations: | 208,257 |
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| Unmarried population in Johnson County under 18 years old in homes | | Total Population: | 143,107 | Unmarried partner of home lead present: | 6,338 | In family homes: | 5,823 | Population of male led and male partner homes: | 286 | Population of male led and female partner households: | 2,382 | Population of female led and female partner households: | 383 | Population of female led and male partner households: | 2,772 | In nonfamily homes: | 515 | Population of male led and male partner homes: | 4 | Population of male led and female partner homes: | 430 | Population of female led and female partner homes: | 29 | Population of female led and male partner homes: | 52 | No unmarried partner of home lead present: | 136,769 | In family homes: | 136,486 | Population of husband-wife family homes: | 113,745 | Population of male lead with no wife present, family homes: | 4,857 | Population of female lead with no husband present, family homes: | 17,884 | In nonfamily homes: | 283 |
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| Population in families living in Johnson County | | Total Population: | 447,909 | Population Under 18 years: | 141,506 | Population 18 years and over: | 306,403 |
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| How long in Johnson County have lived in one place. | | Total: | 212,882 | Population of Owner occupied homes: | 150,722 | Family home: | 117,406 | Nonfamily homess: | 33,316 | Male led home: | 13,472 | Living alone: | 10,262 | Not living alone: | 3,210 | Female led home: | 19,844 | Living alone: | 17,391 | Not living alone: | 2,453 | Population of Renter occupied homes: | 62,160 | Family run homes: | 27,856 | Husband-wife family: | 15,594 | Other family: | 12,262 | Male led with no wife present: | 3,427 | Female led with no husband present: | 8,835 | Nonfamily Homes: | 34,304 | Male led homes: | 16,187 | Male living alone: | 12,216 | Male not living alone: | 3,971 | Female led homes: | 18,117 | Females living alone: | 15,019 | Females not living alone: | 3,098 |
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