Population Demographics for Piatt County, Illinois in 2020, 2019
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| Total population in Piatt County | | | Total Population: | 16,729 | | Male Population: | 8,271 | | Female Population: | 8,458 |
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| Median age in Piatt County | | | Both sexes | 42 | | Male | 41 | | Female | 43 |
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| Population in households in Piatt County | | | Total Population: | 16,657 | | Male Population: | 8,239 | | Under 5 years: | 514 | | 5 to 9 years: | 591 | | 10 to 14 years: | 583 | | 15 to 17 years: | 372 | | 18 and 19 years: | 213 | | 20 years: | 82 | | 21 years: | 84 | | 22 to 24 years: | 205 | | 25 to 29 years: | 422 | | 30 to 34 years: | 462 | | 35 to 39 years: | 471 | | 40 to 44 years: | 509 | | 45 to 49 years: | 695 | | 50 to 54 years: | 725 | | 55 to 59 years: | 620 | | 60 and 61 years: | 200 | | 62 to 64 years: | 314 | | 65 and 66 years: | 154 | | 67 to 69 years: | 230 | | 70 to 74 years: | 310 | | 75 to 79 years: | 195 | | 80 to 84 years: | 166 | | 85 years and over: | 122 | | Female Population: | 8,418 | | Under 5 years: | 431 | | 5 to 9 years: | 528 | | 10 to 14 years: | 598 | | 15 to 17 years: | 390 | | 18 and 19 years: | 140 | | 20 years: | 67 | | 21 years: | 61 | | 22 to 24 years: | 221 | | 25 to 29 years: | 406 | | 30 to 34 years: | 463 | | 35 to 39 years: | 520 | | 40 to 44 years: | 539 | | 45 to 49 years: | 680 | | 50 to 54 years: | 736 | | 55 to 59 years: | 601 | | 60 and 61 years: | 214 | | 62 to 64 years: | 326 | | 65 and 66 years: | 172 | | 67 to 69 years: | 240 | | 70 to 74 years: | 367 | | 75 to 79 years: | 256 | | 80 to 84 years: | 227 | | 85 years and over: | 235 |
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| Average household size in Piatt County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Piatt County | | | Total: | 6,782 | | Family led homes: | 4,823 | | Husband-wife family: | 4,029 | | Other family: | 794 | | Population of male led with no wife present: | 249 | | Population female led with no husband present: | 545 | | Population of Nonfamily homes: | 1,959 | | Population living alone: | 1,663 | | Population not living alone: | 296 |
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| Total occupied homes in Piatt County with people under 18 years old: | | | Total: | 6,782 | | Population of homes with one or more people under 18 years: | 2,173 | | Population of family homes: | 2,149 | | Husband-wife family: | 1,622 | | Under 6 years only: | 298 | | Under 6 years and 6 to 17 years: | 313 | | 6 to 17 years only: | 1,011 | | Other family: | 527 | | Male householder, no wife present: | 160 | | Under 6 years only: | 50 | | Under 6 years and 6 to 17 years: | 20 | | 6 to 17 years only: | 90 | | Female led with no husband present: | 367 | | Under 6 years only: | 73 | | Under 6 years and 6 to 17 years: | 59 | | 6 to 17 years only: | 235 | | Nonfamily households: | 24 | | Male led households: | 21 | | Under 6 years only: | 2 | | Under 6 years and 6 to 17 years: | 3 | | 6 to 17 years only: | 16 | | Female led householder: | 3 | | Under 6 years only: | 1 | | Under 6 years and 6 to 17 years: | 0 | | 6 to 17 years only: | 2 | | Households with no people under 18 years: | 4,609 | | Family households: | 2,674 | | Husband-wife family: | 2,407 | | Other family: | 267 | | Male led with no wife present: | 89 | | Female led with no husband present: | 178 | | Nonfamily households: | 1,935 | | Male led householder: | 882 | | Female led householder: | 1,053 |
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| Total number led homes in Piatt County, by type | | | Total Home Population: | 6,782 | | Population of Family homes: | 4,823 | | Population of 15 to 24 year olds: | 75 | | Population of 25 to 34 year olds: | 644 | | Population of 35 to 44 year olds: | 911 | | Population of 45 to 54 year olds: | 1,208 | | Population of 55 to 59 year olds: | 516 | | Population of 60 to 64 year olds: | 443 | | Population of 65 to 74 year olds: | 618 | | Population of 75 to 84 year olds: | 326 | | Population of 85 year olds and over: | 82 | | Population of Nonfamily Homes: | 1,959 | | Population of 15 to 24 year olds: | 86 | | Population of 25 to 34 year olds: | 203 | | Population of 35 to 44 year olds: | 163 | | Population of 45 to 54 year olds: | 337 | | Population of 55 to 59 year olds: | 183 | | Population of 60 to 64 year olds: | 195 | | Population of 65 to 74 year olds: | 296 | | Population of 75 to 84 year olds: | 280 | | Population of 85 year olds and over: | 216 |
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| households in Piatt County containing people over 60 | | | Total Population: | 6,782 | | Population of homes with one or more people 60 years and over: | 2,580 | | 1-person household: | 933 | | 2-or-more-person household: | 1,647 | | Family households: | 1,582 | | Nonfamily households: | 65 | | Population of homes with no people 60 years and over: | 4,202 | | 1-person household: | 730 | | 2-or-more-person household: | 3,472 | | Family homes: | 3,241 | | Nonfamily homes: | 231 |
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| homes in Piatt County with multiple generations. | | | Total Population: | 6,782 | | Home has three or more generations: | 143 | | Home does not have three or more generations: | 6,639 |
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| Unmarried population in Piatt County under 18 years old in homes | | | Total Population: | 4,007 | | Unmarried partner of home lead present: | 283 | | In family homes: | 253 | | Population of male led and male partner homes: | 7 | | Population of male led and female partner households: | 137 | | Population of female led and female partner households: | 7 | | Population of female led and male partner households: | 102 | | In nonfamily homes: | 30 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 28 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 2 | | No unmarried partner of home lead present: | 3,724 | | In family homes: | 3,716 | | Population of husband-wife family homes: | 3,111 | | Population of male lead with no wife present, family homes: | 120 | | Population of female lead with no husband present, family homes: | 485 | | In nonfamily homes: | 8 |
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| Population in families living in Piatt County | | | Total Population: | 14,062 | | Population Under 18 years: | 3,932 | | Population 18 years and over: | 10,130 |
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| How long in Piatt County have lived in one place. | | | Total: | 6,782 | | Population of Owner occupied homes: | 5,497 | | Family home: | 4,131 | | Nonfamily homess: | 1,366 | | Male led home: | 633 | | Living alone: | 522 | | Not living alone: | 111 | | Female led home: | 733 | | Living alone: | 654 | | Not living alone: | 79 | | Population of Renter occupied homes: | 1,285 | | Family run homes: | 692 | | Husband-wife family: | 394 | | Other family: | 298 | | Male led with no wife present: | 80 | | Female led with no husband present: | 218 | | Nonfamily Homes: | 593 | | Male led homes: | 270 | | Male living alone: | 208 | | Male not living alone: | 62 | | Female led homes: | 323 | | Females living alone: | 279 | | Females not living alone: | 44 |
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