Population Demographics for Quincy, Illinois in 2020, 2019
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| Total population in Quincy | | | Total Population: | 40,633 | | Male Population: | 19,465 | | Female Population: | 21,168 |
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| Median age in Quincy | | | Both sexes | 39 | | Male | 37 | | Female | 41 |
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| Population in households in Quincy | | | Total Population: | 38,546 | | Male Population: | 18,374 | | Under 5 years: | 1,364 | | 5 to 9 years: | 1,316 | | 10 to 14 years: | 1,131 | | 15 to 17 years: | 755 | | 18 and 19 years: | 472 | | 20 years: | 227 | | 21 years: | 228 | | 22 to 24 years: | 760 | | 25 to 29 years: | 1,307 | | 30 to 34 years: | 1,188 | | 35 to 39 years: | 1,107 | | 40 to 44 years: | 1,130 | | 45 to 49 years: | 1,345 | | 50 to 54 years: | 1,329 | | 55 to 59 years: | 1,185 | | 60 and 61 years: | 449 | | 62 to 64 years: | 566 | | 65 and 66 years: | 338 | | 67 to 69 years: | 433 | | 70 to 74 years: | 565 | | 75 to 79 years: | 463 | | 80 to 84 years: | 396 | | 85 years and over: | 320 | | Female Population: | 20,172 | | Under 5 years: | 1,308 | | 5 to 9 years: | 1,223 | | 10 to 14 years: | 1,101 | | 15 to 17 years: | 757 | | 18 and 19 years: | 482 | | 20 years: | 247 | | 21 years: | 278 | | 22 to 24 years: | 858 | | 25 to 29 years: | 1,438 | | 30 to 34 years: | 1,140 | | 35 to 39 years: | 1,121 | | 40 to 44 years: | 1,139 | | 45 to 49 years: | 1,398 | | 50 to 54 years: | 1,366 | | 55 to 59 years: | 1,287 | | 60 and 61 years: | 479 | | 62 to 64 years: | 671 | | 65 and 66 years: | 380 | | 67 to 69 years: | 573 | | 70 to 74 years: | 784 | | 75 to 79 years: | 724 | | 80 to 84 years: | 714 | | 85 years and over: | 704 |
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| Average household size in Quincy | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Quincy | | | Total: | 17,151 | | Family led homes: | 9,964 | | Husband-wife family: | 7,113 | | Other family: | 2,851 | | Population of male led with no wife present: | 688 | | Population female led with no husband present: | 2,163 | | Population of Nonfamily homes: | 7,187 | | Population living alone: | 6,113 | | Population not living alone: | 1,074 |
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| Total occupied homes in Quincy with people under 18 years old: | | | Total: | 17,151 | | Population of homes with one or more people under 18 years: | 4,876 | | Population of family homes: | 4,793 | | Husband-wife family: | 2,816 | | Under 6 years only: | 699 | | Under 6 years and 6 to 17 years: | 661 | | 6 to 17 years only: | 1,456 | | Other family: | 1,977 | | Male householder, no wife present: | 441 | | Under 6 years only: | 147 | | Under 6 years and 6 to 17 years: | 84 | | 6 to 17 years only: | 210 | | Female led with no husband present: | 1,536 | | Under 6 years only: | 431 | | Under 6 years and 6 to 17 years: | 310 | | 6 to 17 years only: | 795 | | Nonfamily households: | 83 | | Male led households: | 67 | | Under 6 years only: | 16 | | Under 6 years and 6 to 17 years: | 9 | | 6 to 17 years only: | 42 | | Female led householder: | 16 | | Under 6 years only: | 4 | | Under 6 years and 6 to 17 years: | 1 | | 6 to 17 years only: | 11 | | Households with no people under 18 years: | 12,275 | | Family households: | 5,171 | | Husband-wife family: | 4,297 | | Other family: | 874 | | Male led with no wife present: | 247 | | Female led with no husband present: | 627 | | Nonfamily households: | 7,104 | | Male led householder: | 3,058 | | Female led householder: | 4,046 |
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| Total number led homes in Quincy, by type | | | Total Home Population: | 17,151 | | Population of Family homes: | 9,964 | | Population of 15 to 24 year olds: | 455 | | Population of 25 to 34 year olds: | 1,766 | | Population of 35 to 44 year olds: | 1,902 | | Population of 45 to 54 year olds: | 2,068 | | Population of 55 to 59 year olds: | 908 | | Population of 60 to 64 year olds: | 807 | | Population of 65 to 74 year olds: | 1,129 | | Population of 75 to 84 year olds: | 718 | | Population of 85 year olds and over: | 211 | | Population of Nonfamily Homes: | 7,187 | | Population of 15 to 24 year olds: | 617 | | Population of 25 to 34 year olds: | 896 | | Population of 35 to 44 year olds: | 681 | | Population of 45 to 54 year olds: | 1,158 | | Population of 55 to 59 year olds: | 631 | | Population of 60 to 64 year olds: | 571 | | Population of 65 to 74 year olds: | 939 | | Population of 75 to 84 year olds: | 1,025 | | Population of 85 year olds and over: | 669 |
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| households in Quincy containing people over 60 | | | Total Population: | 17,151 | | Population of homes with one or more people 60 years and over: | 6,363 | | 1-person household: | 3,069 | | 2-or-more-person household: | 3,294 | | Family households: | 3,122 | | Nonfamily households: | 172 | | Population of homes with no people 60 years and over: | 10,788 | | 1-person household: | 3,044 | | 2-or-more-person household: | 7,744 | | Family homes: | 6,842 | | Nonfamily homes: | 902 |
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| homes in Quincy with multiple generations. | | | Total Population: | 17,151 | | Home has three or more generations: | 409 | | Home does not have three or more generations: | 16,742 |
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| Unmarried population in Quincy under 18 years old in homes | | | Total Population: | 8,945 | | Unmarried partner of home lead present: | 974 | | In family homes: | 889 | | Population of male led and male partner homes: | 15 | | Population of male led and female partner households: | 363 | | Population of female led and female partner households: | 23 | | Population of female led and male partner households: | 488 | | In nonfamily homes: | 85 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 74 | | Population of female led and female partner homes: | 0 | | Population of female led and male partner homes: | 11 | | No unmarried partner of home lead present: | 7,971 | | In family homes: | 7,944 | | Population of husband-wife family homes: | 5,445 | | Population of male lead with no wife present, family homes: | 339 | | Population of female lead with no husband present, family homes: | 2,160 | | In nonfamily homes: | 27 |
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| Population in families living in Quincy | | | Total Population: | 29,046 | | Population Under 18 years: | 8,731 | | Population 18 years and over: | 20,315 |
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| How long in Quincy have lived in one place. | | | Total: | 17,151 | | Population of Owner occupied homes: | 11,011 | | Family home: | 7,414 | | Nonfamily homess: | 3,597 | | Male led home: | 1,444 | | Living alone: | 1,166 | | Not living alone: | 278 | | Female led home: | 2,153 | | Living alone: | 1,971 | | Not living alone: | 182 | | Population of Renter occupied homes: | 6,140 | | Family run homes: | 2,550 | | Husband-wife family: | 1,069 | | Other family: | 1,481 | | Male led with no wife present: | 309 | | Female led with no husband present: | 1,172 | | Nonfamily Homes: | 3,590 | | Male led homes: | 1,681 | | Male living alone: | 1,344 | | Male not living alone: | 337 | | Female led homes: | 1,909 | | Females living alone: | 1,632 | | Females not living alone: | 277 |
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