Population Demographics for Knox County, Illinois in 2020, 2019
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| | Male | Female | Total | | Total Population | 26,582 | 26,337 | 52,919 | | White | 22,509 | 23,820 | 46,329 | | Black or African American | 2,516 | 1,294 | 3,810 | | Hispanic or Latino | 1,475 | 1,083 | 2,558 | | Two or More Races | 658 | 648 | 1,306 | | Some Other Race | 685 | 338 | 1,023 | | Asian | 151 | 187 | 338 | | American Indian | 59 | 45 | 104 |
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| Total population in Knox County | | | Total Population: | 52,919 | | Male Population: | 26,582 | | Female Population: | 26,337 |
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| Median age in Knox County | | | Both sexes | 42 | | Male | 39 | | Female | 44 |
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| Population in households in Knox County | | | Total Population: | 48,964 | | Male Population: | 23,864 | | Under 5 years: | 1,440 | | 5 to 9 years: | 1,592 | | 10 to 14 years: | 1,586 | | 15 to 17 years: | 993 | | 18 and 19 years: | 575 | | 20 years: | 286 | | 21 years: | 273 | | 22 to 24 years: | 807 | | 25 to 29 years: | 1,295 | | 30 to 34 years: | 1,338 | | 35 to 39 years: | 1,335 | | 40 to 44 years: | 1,385 | | 45 to 49 years: | 1,669 | | 50 to 54 years: | 1,805 | | 55 to 59 years: | 1,869 | | 60 and 61 years: | 644 | | 62 to 64 years: | 956 | | 65 and 66 years: | 520 | | 67 to 69 years: | 749 | | 70 to 74 years: | 956 | | 75 to 79 years: | 794 | | 80 to 84 years: | 550 | | 85 years and over: | 447 | | Female Population: | 25,100 | | Under 5 years: | 1,327 | | 5 to 9 years: | 1,524 | | 10 to 14 years: | 1,458 | | 15 to 17 years: | 913 | | 18 and 19 years: | 586 | | 20 years: | 251 | | 21 years: | 273 | | 22 to 24 years: | 820 | | 25 to 29 years: | 1,288 | | 30 to 34 years: | 1,365 | | 35 to 39 years: | 1,335 | | 40 to 44 years: | 1,475 | | 45 to 49 years: | 1,778 | | 50 to 54 years: | 1,921 | | 55 to 59 years: | 1,975 | | 60 and 61 years: | 648 | | 62 to 64 years: | 1,026 | | 65 and 66 years: | 613 | | 67 to 69 years: | 811 | | 70 to 74 years: | 1,101 | | 75 to 79 years: | 1,011 | | 80 to 84 years: | 799 | | 85 years and over: | 802 |
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| Average household size in Knox County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Knox County | | | Total: | 21,535 | | Family led homes: | 13,324 | | Husband-wife family: | 9,847 | | Other family: | 3,477 | | Population of male led with no wife present: | 908 | | Population female led with no husband present: | 2,569 | | Population of Nonfamily homes: | 8,211 | | Population living alone: | 6,954 | | Population not living alone: | 1,257 |
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| Total occupied homes in Knox County with people under 18 years old: | | | Total: | 21,535 | | Population of homes with one or more people under 18 years: | 5,866 | | Population of family homes: | 5,748 | | Husband-wife family: | 3,340 | | Under 6 years only: | 655 | | Under 6 years and 6 to 17 years: | 711 | | 6 to 17 years only: | 1,974 | | Other family: | 2,408 | | Male householder, no wife present: | 577 | | Under 6 years only: | 176 | | Under 6 years and 6 to 17 years: | 111 | | 6 to 17 years only: | 290 | | Female led with no husband present: | 1,831 | | Under 6 years only: | 481 | | Under 6 years and 6 to 17 years: | 366 | | 6 to 17 years only: | 984 | | Nonfamily households: | 118 | | Male led households: | 101 | | Under 6 years only: | 18 | | Under 6 years and 6 to 17 years: | 14 | | 6 to 17 years only: | 69 | | Female led householder: | 17 | | Under 6 years only: | 3 | | Under 6 years and 6 to 17 years: | 3 | | 6 to 17 years only: | 11 | | Households with no people under 18 years: | 15,669 | | Family households: | 7,576 | | Husband-wife family: | 6,507 | | Other family: | 1,069 | | Male led with no wife present: | 331 | | Female led with no husband present: | 738 | | Nonfamily households: | 8,093 | | Male led householder: | 3,744 | | Female led householder: | 4,349 |
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| Total number led homes in Knox County, by type | | | Total Home Population: | 21,535 | | Population of Family homes: | 13,324 | | Population of 15 to 24 year olds: | 433 | | Population of 25 to 34 year olds: | 1,865 | | Population of 35 to 44 year olds: | 2,333 | | Population of 45 to 54 year olds: | 2,727 | | Population of 55 to 59 year olds: | 1,500 | | Population of 60 to 64 year olds: | 1,260 | | Population of 65 to 74 year olds: | 1,852 | | Population of 75 to 84 year olds: | 1,071 | | Population of 85 year olds and over: | 283 | | Population of Nonfamily Homes: | 8,211 | | Population of 15 to 24 year olds: | 533 | | Population of 25 to 34 year olds: | 795 | | Population of 35 to 44 year olds: | 721 | | Population of 45 to 54 year olds: | 1,344 | | Population of 55 to 59 year olds: | 802 | | Population of 60 to 64 year olds: | 761 | | Population of 65 to 74 year olds: | 1,247 | | Population of 75 to 84 year olds: | 1,236 | | Population of 85 year olds and over: | 772 |
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| households in Knox County containing people over 60 | | | Total Population: | 21,535 | | Population of homes with one or more people 60 years and over: | 8,929 | | 1-person household: | 3,789 | | 2-or-more-person household: | 5,140 | | Family households: | 4,871 | | Nonfamily households: | 269 | | Population of homes with no people 60 years and over: | 12,606 | | 1-person household: | 3,165 | | 2-or-more-person household: | 9,441 | | Family homes: | 8,453 | | Nonfamily homes: | 988 |
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| homes in Knox County with multiple generations. | | | Total Population: | 21,535 | | Home has three or more generations: | 559 | | Home does not have three or more generations: | 20,976 |
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| Unmarried population in Knox County under 18 years old in homes | | | Total Population: | 10,821 | | Unmarried partner of home lead present: | 1,501 | | In family homes: | 1,371 | | Population of male led and male partner homes: | 9 | | Population of male led and female partner households: | 536 | | Population of female led and female partner households: | 27 | | Population of female led and male partner households: | 799 | | In nonfamily homes: | 130 | | Population of male led and male partner homes: | 0 | | Population of male led and female partner homes: | 119 | | Population of female led and female partner homes: | 1 | | Population of female led and male partner homes: | 10 | | No unmarried partner of home lead present: | 9,320 | | In family homes: | 9,287 | | Population of husband-wife family homes: | 6,304 | | Population of male lead with no wife present, family homes: | 465 | | Population of female lead with no husband present, family homes: | 2,518 | | In nonfamily homes: | 33 |
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| Population in families living in Knox County | | | Total Population: | 37,840 | | Population Under 18 years: | 10,485 | | Population 18 years and over: | 27,355 |
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| How long in Knox County have lived in one place. | | | Total: | 21,535 | | Population of Owner occupied homes: | 15,003 | | Family home: | 10,456 | | Nonfamily homess: | 4,547 | | Male led home: | 2,029 | | Living alone: | 1,602 | | Not living alone: | 427 | | Female led home: | 2,518 | | Living alone: | 2,239 | | Not living alone: | 279 | | Population of Renter occupied homes: | 6,532 | | Family run homes: | 2,868 | | Husband-wife family: | 1,196 | | Other family: | 1,672 | | Male led with no wife present: | 341 | | Female led with no husband present: | 1,331 | | Nonfamily Homes: | 3,664 | | Male led homes: | 1,816 | | Male living alone: | 1,503 | | Male not living alone: | 313 | | Female led homes: | 1,848 | | Females living alone: | 1,610 | | Females not living alone: | 238 |
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