Population Demographics for Johnston, Iowa in 2020, 2019
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| Total population in Johnston | | | Total Population: | 17,278 | | Male Population: | 8,458 | | Female Population: | 8,820 |
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| Median age in Johnston | | | Both sexes | 37 | | Male | 35 | | Female | 38 |
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| Population in households in Johnston | | | Total Population: | 17,032 | | Male Population: | 8,362 | | Under 5 years: | 660 | | 5 to 9 years: | 791 | | 10 to 14 years: | 758 | | 15 to 17 years: | 454 | | 18 and 19 years: | 157 | | 20 years: | 52 | | 21 years: | 50 | | 22 to 24 years: | 217 | | 25 to 29 years: | 481 | | 30 to 34 years: | 505 | | 35 to 39 years: | 640 | | 40 to 44 years: | 745 | | 45 to 49 years: | 741 | | 50 to 54 years: | 580 | | 55 to 59 years: | 510 | | 60 and 61 years: | 153 | | 62 to 64 years: | 200 | | 65 and 66 years: | 94 | | 67 to 69 years: | 131 | | 70 to 74 years: | 169 | | 75 to 79 years: | 121 | | 80 to 84 years: | 92 | | 85 years and over: | 61 | | Female Population: | 8,670 | | Under 5 years: | 579 | | 5 to 9 years: | 765 | | 10 to 14 years: | 733 | | 15 to 17 years: | 378 | | 18 and 19 years: | 162 | | 20 years: | 49 | | 21 years: | 59 | | 22 to 24 years: | 243 | | 25 to 29 years: | 477 | | 30 to 34 years: | 559 | | 35 to 39 years: | 730 | | 40 to 44 years: | 818 | | 45 to 49 years: | 711 | | 50 to 54 years: | 630 | | 55 to 59 years: | 514 | | 60 and 61 years: | 173 | | 62 to 64 years: | 205 | | 65 and 66 years: | 134 | | 67 to 69 years: | 163 | | 70 to 74 years: | 179 | | 75 to 79 years: | 137 | | 80 to 84 years: | 125 | | 85 years and over: | 147 |
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| Average household size in Johnston | | | Total: | 3 | | Under 18 years: | 1 | | 18 years and over: | 2 |
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| Number of occupied homes in Johnston | | | Total: | 6,369 | | Family led homes: | 4,720 | | Husband-wife family: | 4,103 | | Other family: | 617 | | Population of male led with no wife present: | 185 | | Population female led with no husband present: | 432 | | Population of Nonfamily homes: | 1,649 | | Population living alone: | 1,321 | | Population not living alone: | 328 |
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| Total occupied homes in Johnston with people under 18 years old: | | | Total: | 6,369 | | Population of homes with one or more people under 18 years: | 2,690 | | Population of family homes: | 2,677 | | Husband-wife family: | 2,213 | | Under 6 years only: | 494 | | Under 6 years and 6 to 17 years: | 488 | | 6 to 17 years only: | 1,231 | | Other family: | 464 | | Male householder, no wife present: | 131 | | Under 6 years only: | 28 | | Under 6 years and 6 to 17 years: | 18 | | 6 to 17 years only: | 85 | | Female led with no husband present: | 333 | | Under 6 years only: | 52 | | Under 6 years and 6 to 17 years: | 59 | | 6 to 17 years only: | 222 | | Nonfamily households: | 13 | | Male led households: | 11 | | Under 6 years only: | 4 | | Under 6 years and 6 to 17 years: | 1 | | 6 to 17 years only: | 6 | | Female led householder: | 2 | | Under 6 years only: | 0 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 2 | | Households with no people under 18 years: | 3,679 | | Family households: | 2,043 | | Husband-wife family: | 1,890 | | Other family: | 153 | | Male led with no wife present: | 54 | | Female led with no husband present: | 99 | | Nonfamily households: | 1,636 | | Male led householder: | 666 | | Female led householder: | 970 |
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| Total number led homes in Johnston, by type | | | Total Home Population: | 6,369 | | Population of Family homes: | 4,720 | | Population of 15 to 24 year olds: | 80 | | Population of 25 to 34 year olds: | 700 | | Population of 35 to 44 year olds: | 1,344 | | Population of 45 to 54 year olds: | 1,235 | | Population of 55 to 59 year olds: | 456 | | Population of 60 to 64 year olds: | 334 | | Population of 65 to 74 year olds: | 360 | | Population of 75 to 84 year olds: | 176 | | Population of 85 year olds and over: | 35 | | Population of Nonfamily Homes: | 1,649 | | Population of 15 to 24 year olds: | 132 | | Population of 25 to 34 year olds: | 347 | | Population of 35 to 44 year olds: | 200 | | Population of 45 to 54 year olds: | 275 | | Population of 55 to 59 year olds: | 137 | | Population of 60 to 64 year olds: | 101 | | Population of 65 to 74 year olds: | 186 | | Population of 75 to 84 year olds: | 149 | | Population of 85 year olds and over: | 122 |
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| households in Johnston containing people over 60 | | | Total Population: | 6,369 | | Population of homes with one or more people 60 years and over: | 1,569 | | 1-person household: | 531 | | 2-or-more-person household: | 1,038 | | Family households: | 1,002 | | Nonfamily households: | 36 | | Population of homes with no people 60 years and over: | 4,800 | | 1-person household: | 790 | | 2-or-more-person household: | 4,010 | | Family homes: | 3,718 | | Nonfamily homes: | 292 |
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| homes in Johnston with multiple generations. | | | Total Population: | 6,369 | | Home has three or more generations: | 95 | | Home does not have three or more generations: | 6,274 |
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| Unmarried population in Johnston under 18 years old in homes | | | Total Population: | 5,116 | | Unmarried partner of home lead present: | 155 | | In family homes: | 145 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner households: | 69 | | Population of female led and female partner households: | 8 | | Population of female led and male partner households: | 68 | | In nonfamily homes: | 10 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 9 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 1 | | No unmarried partner of home lead present: | 4,961 | | In family homes: | 4,953 | | Population of husband-wife family homes: | 4,329 | | Population of male lead with no wife present, family homes: | 132 | | Population of female lead with no husband present, family homes: | 492 | | In nonfamily homes: | 8 |
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| Population in families living in Johnston | | | Total Population: | 14,836 | | Population Under 18 years: | 5,070 | | Population 18 years and over: | 9,766 |
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| How long in Johnston have lived in one place. | | | Total: | 6,369 | | Population of Owner occupied homes: | 4,953 | | Family home: | 4,089 | | Nonfamily homess: | 864 | | Male led home: | 349 | | Living alone: | 252 | | Not living alone: | 97 | | Female led home: | 515 | | Living alone: | 446 | | Not living alone: | 69 | | Population of Renter occupied homes: | 1,416 | | Family run homes: | 631 | | Husband-wife family: | 362 | | Other family: | 269 | | Male led with no wife present: | 53 | | Female led with no husband present: | 216 | | Nonfamily Homes: | 785 | | Male led homes: | 328 | | Male living alone: | 241 | | Male not living alone: | 87 | | Female led homes: | 457 | | Females living alone: | 382 | | Females not living alone: | 75 |
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