Population Demographics for Johnson County, Illinois in 2020, 2019
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| Total population in Johnson County | | | Total Population: | 12,582 | | Male Population: | 7,018 | | Female Population: | 5,564 |
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| Median age in Johnson County | | | Both sexes | 42 | | Male | 39 | | Female | 45 |
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| Population in households in Johnson County | | | Total Population: | 11,029 | | Male Population: | 5,499 | | Under 5 years: | 286 | | 5 to 9 years: | 338 | | 10 to 14 years: | 377 | | 15 to 17 years: | 249 | | 18 and 19 years: | 136 | | 20 years: | 59 | | 21 years: | 53 | | 22 to 24 years: | 145 | | 25 to 29 years: | 247 | | 30 to 34 years: | 287 | | 35 to 39 years: | 333 | | 40 to 44 years: | 334 | | 45 to 49 years: | 395 | | 50 to 54 years: | 420 | | 55 to 59 years: | 411 | | 60 and 61 years: | 172 | | 62 to 64 years: | 244 | | 65 and 66 years: | 147 | | 67 to 69 years: | 227 | | 70 to 74 years: | 294 | | 75 to 79 years: | 175 | | 80 to 84 years: | 105 | | 85 years and over: | 65 | | Female Population: | 5,530 | | Under 5 years: | 280 | | 5 to 9 years: | 357 | | 10 to 14 years: | 333 | | 15 to 17 years: | 218 | | 18 and 19 years: | 133 | | 20 years: | 47 | | 21 years: | 41 | | 22 to 24 years: | 154 | | 25 to 29 years: | 242 | | 30 to 34 years: | 279 | | 35 to 39 years: | 301 | | 40 to 44 years: | 365 | | 45 to 49 years: | 392 | | 50 to 54 years: | 459 | | 55 to 59 years: | 400 | | 60 and 61 years: | 182 | | 62 to 64 years: | 242 | | 65 and 66 years: | 138 | | 67 to 69 years: | 221 | | 70 to 74 years: | 259 | | 75 to 79 years: | 218 | | 80 to 84 years: | 137 | | 85 years and over: | 132 |
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| Average household size in Johnson County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Johnson County | | | Total: | 4,584 | | Family led homes: | 3,270 | | Husband-wife family: | 2,713 | | Other family: | 557 | | Population of male led with no wife present: | 178 | | Population female led with no husband present: | 379 | | Population of Nonfamily homes: | 1,314 | | Population living alone: | 1,160 | | Population not living alone: | 154 |
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| Total occupied homes in Johnson County with people under 18 years old: | | | Total: | 4,584 | | Population of homes with one or more people under 18 years: | 1,318 | | Population of family homes: | 1,301 | | Husband-wife family: | 947 | | Under 6 years only: | 194 | | Under 6 years and 6 to 17 years: | 193 | | 6 to 17 years only: | 560 | | Other family: | 354 | | Male householder, no wife present: | 104 | | Under 6 years only: | 17 | | Under 6 years and 6 to 17 years: | 18 | | 6 to 17 years only: | 69 | | Female led with no husband present: | 250 | | Under 6 years only: | 51 | | Under 6 years and 6 to 17 years: | 43 | | 6 to 17 years only: | 156 | | Nonfamily households: | 17 | | Male led households: | 15 | | Under 6 years only: | 1 | | Under 6 years and 6 to 17 years: | 2 | | 6 to 17 years only: | 12 | | Female led householder: | 2 | | Under 6 years only: | 1 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 1 | | Households with no people under 18 years: | 3,266 | | Family households: | 1,969 | | Husband-wife family: | 1,766 | | Other family: | 203 | | Male led with no wife present: | 74 | | Female led with no husband present: | 129 | | Nonfamily households: | 1,297 | | Male led householder: | 629 | | Female led householder: | 668 |
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| Total number led homes in Johnson County, by type | | | Total Home Population: | 4,584 | | Population of Family homes: | 3,270 | | Population of 15 to 24 year olds: | 75 | | Population of 25 to 34 year olds: | 404 | | Population of 35 to 44 year olds: | 581 | | Population of 45 to 54 year olds: | 691 | | Population of 55 to 59 year olds: | 335 | | Population of 60 to 64 year olds: | 351 | | Population of 65 to 74 year olds: | 548 | | Population of 75 to 84 year olds: | 242 | | Population of 85 year olds and over: | 43 | | Population of Nonfamily Homes: | 1,314 | | Population of 15 to 24 year olds: | 36 | | Population of 25 to 34 year olds: | 92 | | Population of 35 to 44 year olds: | 128 | | Population of 45 to 54 year olds: | 211 | | Population of 55 to 59 year olds: | 129 | | Population of 60 to 64 year olds: | 121 | | Population of 65 to 74 year olds: | 269 | | Population of 75 to 84 year olds: | 215 | | Population of 85 year olds and over: | 113 |
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| households in Johnson County containing people over 60 | | | Total Population: | 4,584 | | Population of homes with one or more people 60 years and over: | 2,023 | | 1-person household: | 683 | | 2-or-more-person household: | 1,340 | | Family households: | 1,301 | | Nonfamily households: | 39 | | Population of homes with no people 60 years and over: | 2,561 | | 1-person household: | 477 | | 2-or-more-person household: | 2,084 | | Family homes: | 1,969 | | Nonfamily homes: | 115 |
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| homes in Johnson County with multiple generations. | | | Total Population: | 4,584 | | Home has three or more generations: | 99 | | Home does not have three or more generations: | 4,485 |
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| Unmarried population in Johnson County under 18 years old in homes | | | Total Population: | 2,437 | | Unmarried partner of home lead present: | 179 | | In family homes: | 161 | | Population of male led and male partner homes: | 1 | | Population of male led and female partner households: | 65 | | Population of female led and female partner households: | 12 | | Population of female led and male partner households: | 83 | | In nonfamily homes: | 18 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 18 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 0 | | No unmarried partner of home lead present: | 2,258 | | In family homes: | 2,252 | | Population of husband-wife family homes: | 1,817 | | Population of male lead with no wife present, family homes: | 123 | | Population of female lead with no husband present, family homes: | 312 | | In nonfamily homes: | 6 |
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| Population in families living in Johnson County | | | Total Population: | 9,327 | | Population Under 18 years: | 2,378 | | Population 18 years and over: | 6,949 |
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| How long in Johnson County have lived in one place. | | | Total: | 4,584 | | Population of Owner occupied homes: | 3,756 | | Family home: | 2,848 | | Nonfamily homess: | 908 | | Male led home: | 471 | | Living alone: | 395 | | Not living alone: | 76 | | Female led home: | 437 | | Living alone: | 395 | | Not living alone: | 42 | | Population of Renter occupied homes: | 828 | | Family run homes: | 422 | | Husband-wife family: | 224 | | Other family: | 198 | | Male led with no wife present: | 50 | | Female led with no husband present: | 148 | | Nonfamily Homes: | 406 | | Male led homes: | 173 | | Male living alone: | 149 | | Male not living alone: | 24 | | Female led homes: | 233 | | Females living alone: | 221 | | Females not living alone: | 12 |
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