Population Demographics for Williamson County, Illinois in 2020, 2019
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| | Male | Female | Total | | Total Population | 32,824 | 33,533 | 66,357 | | White | 30,101 | 31,441 | 61,542 | | Black or African American | 1,574 | 966 | 2,540 | | Hispanic or Latino | 741 | 560 | 1,301 | | Two or More Races | 536 | 562 | 1,098 | | Asian | 258 | 303 | 561 | | Some Other Race | 209 | 153 | 362 | | American Indian | 142 | 104 | 246 |
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| Total population in Williamson County | | | Total Population: | 66,357 | | Male Population: | 32,824 | | Female Population: | 33,533 |
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| Median age in Williamson County | | | Both sexes | 40 | | Male | 39 | | Female | 41 |
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| Population in households in Williamson County | | | Total Population: | 64,487 | | Male Population: | 31,343 | | Under 5 years: | 2,099 | | 5 to 9 years: | 2,128 | | 10 to 14 years: | 2,041 | | 15 to 17 years: | 1,242 | | 18 and 19 years: | 820 | | 20 years: | 350 | | 21 years: | 358 | | 22 to 24 years: | 1,154 | | 25 to 29 years: | 1,979 | | 30 to 34 years: | 2,006 | | 35 to 39 years: | 2,007 | | 40 to 44 years: | 1,987 | | 45 to 49 years: | 2,316 | | 50 to 54 years: | 2,304 | | 55 to 59 years: | 2,104 | | 60 and 61 years: | 777 | | 62 to 64 years: | 1,211 | | 65 and 66 years: | 634 | | 67 to 69 years: | 891 | | 70 to 74 years: | 1,162 | | 75 to 79 years: | 849 | | 80 to 84 years: | 515 | | 85 years and over: | 409 | | Female Population: | 33,144 | | Under 5 years: | 1,956 | | 5 to 9 years: | 2,040 | | 10 to 14 years: | 1,950 | | 15 to 17 years: | 1,223 | | 18 and 19 years: | 854 | | 20 years: | 388 | | 21 years: | 438 | | 22 to 24 years: | 1,172 | | 25 to 29 years: | 2,078 | | 30 to 34 years: | 1,996 | | 35 to 39 years: | 2,035 | | 40 to 44 years: | 1,980 | | 45 to 49 years: | 2,365 | | 50 to 54 years: | 2,437 | | 55 to 59 years: | 2,211 | | 60 and 61 years: | 839 | | 62 to 64 years: | 1,266 | | 65 and 66 years: | 777 | | 67 to 69 years: | 976 | | 70 to 74 years: | 1,404 | | 75 to 79 years: | 1,051 | | 80 to 84 years: | 856 | | 85 years and over: | 852 |
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| Average household size in Williamson County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Williamson County | | | Total: | 27,421 | | Family led homes: | 17,999 | | Husband-wife family: | 13,545 | | Other family: | 4,454 | | Population of male led with no wife present: | 1,302 | | Population female led with no husband present: | 3,152 | | Population of Nonfamily homes: | 9,422 | | Population living alone: | 7,974 | | Population not living alone: | 1,448 |
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| Total occupied homes in Williamson County with people under 18 years old: | | | Total: | 27,421 | | Population of homes with one or more people under 18 years: | 8,278 | | Population of family homes: | 8,172 | | Husband-wife family: | 5,159 | | Under 6 years only: | 1,266 | | Under 6 years and 6 to 17 years: | 1,106 | | 6 to 17 years only: | 2,787 | | Other family: | 3,013 | | Male householder, no wife present: | 859 | | Under 6 years only: | 235 | | Under 6 years and 6 to 17 years: | 125 | | 6 to 17 years only: | 499 | | Female led with no husband present: | 2,154 | | Under 6 years only: | 560 | | Under 6 years and 6 to 17 years: | 370 | | 6 to 17 years only: | 1,224 | | Nonfamily households: | 106 | | Male led households: | 78 | | Under 6 years only: | 24 | | Under 6 years and 6 to 17 years: | 9 | | 6 to 17 years only: | 45 | | Female led householder: | 28 | | Under 6 years only: | 5 | | Under 6 years and 6 to 17 years: | 3 | | 6 to 17 years only: | 20 | | Households with no people under 18 years: | 19,143 | | Family households: | 9,827 | | Husband-wife family: | 8,386 | | Other family: | 1,441 | | Male led with no wife present: | 443 | | Female led with no husband present: | 998 | | Nonfamily households: | 9,316 | | Male led householder: | 4,181 | | Female led householder: | 5,135 |
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| Total number led homes in Williamson County, by type | | | Total Home Population: | 27,421 | | Population of Family homes: | 17,999 | | Population of 15 to 24 year olds: | 666 | | Population of 25 to 34 year olds: | 2,912 | | Population of 35 to 44 year olds: | 3,483 | | Population of 45 to 54 year olds: | 3,841 | | Population of 55 to 59 year olds: | 1,633 | | Population of 60 to 64 year olds: | 1,654 | | Population of 65 to 74 year olds: | 2,376 | | Population of 75 to 84 year olds: | 1,160 | | Population of 85 year olds and over: | 274 | | Population of Nonfamily Homes: | 9,422 | | Population of 15 to 24 year olds: | 636 | | Population of 25 to 34 year olds: | 1,141 | | Population of 35 to 44 year olds: | 902 | | Population of 45 to 54 year olds: | 1,520 | | Population of 55 to 59 year olds: | 866 | | Population of 60 to 64 year olds: | 884 | | Population of 65 to 74 year olds: | 1,482 | | Population of 75 to 84 year olds: | 1,246 | | Population of 85 year olds and over: | 745 |
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| households in Williamson County containing people over 60 | | | Total Population: | 27,421 | | Population of homes with one or more people 60 years and over: | 10,356 | | 1-person household: | 4,143 | | 2-or-more-person household: | 6,213 | | Family households: | 5,970 | | Nonfamily households: | 243 | | Population of homes with no people 60 years and over: | 17,065 | | 1-person household: | 3,831 | | 2-or-more-person household: | 13,234 | | Family homes: | 12,029 | | Nonfamily homes: | 1,205 |
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| homes in Williamson County with multiple generations. | | | Total Population: | 27,421 | | Home has three or more generations: | 670 | | Home does not have three or more generations: | 26,751 |
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| Unmarried population in Williamson County under 18 years old in homes | | | Total Population: | 14,660 | | Unmarried partner of home lead present: | 1,474 | | In family homes: | 1,376 | | Population of male led and male partner homes: | 39 | | Population of male led and female partner households: | 575 | | Population of female led and female partner households: | 54 | | Population of female led and male partner households: | 708 | | In nonfamily homes: | 98 | | Population of male led and male partner homes: | 1 | | Population of male led and female partner homes: | 87 | | Population of female led and female partner homes: | 3 | | Population of female led and male partner homes: | 7 | | No unmarried partner of home lead present: | 13,186 | | In family homes: | 13,146 | | Population of husband-wife family homes: | 9,497 | | Population of male lead with no wife present, family homes: | 745 | | Population of female lead with no husband present, family homes: | 2,904 | | In nonfamily homes: | 40 |
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| Population in families living in Williamson County | | | Total Population: | 51,792 | | Population Under 18 years: | 14,366 | | Population 18 years and over: | 37,426 |
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| How long in Williamson County have lived in one place. | | | Total: | 27,421 | | Population of Owner occupied homes: | 19,603 | | Family home: | 14,229 | | Nonfamily homess: | 5,374 | | Male led home: | 2,310 | | Living alone: | 1,893 | | Not living alone: | 417 | | Female led home: | 3,064 | | Living alone: | 2,780 | | Not living alone: | 284 | | Population of Renter occupied homes: | 7,818 | | Family run homes: | 3,770 | | Husband-wife family: | 1,741 | | Other family: | 2,029 | | Male led with no wife present: | 494 | | Female led with no husband present: | 1,535 | | Nonfamily Homes: | 4,048 | | Male led homes: | 1,949 | | Male living alone: | 1,518 | | Male not living alone: | 431 | | Female led homes: | 2,099 | | Females living alone: | 1,783 | | Females not living alone: | 316 |
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