Population Demographics for Rock Island County, Illinois in 2020, 2019
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| | Male | Female | Total | | Total Population | 72,375 | 75,171 | 147,546 | | White | 58,423 | 61,959 | 120,382 | | Hispanic or Latino | 8,729 | 8,389 | 17,118 | | Black or African American | 6,819 | 6,470 | 13,289 | | Some Other Race | 3,448 | 3,107 | 6,555 | | Two or More Races | 2,219 | 2,239 | 4,458 | | Asian | 1,270 | 1,149 | 2,419 | | American Indian | 176 | 219 | 395 | | Three or more races | 129 | 120 | 249 |
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| Total population in Rock Island County | | | Total Population: | 147,546 | | Male Population: | 72,375 | | Female Population: | 75,171 |
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| Median age in Rock Island County | | | Both sexes | 40 | | Male | 38 | | Female | 41 |
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| Population in households in Rock Island County | | | Total Population: | 143,233 | | Male Population: | 69,835 | | Under 5 years: | 4,847 | | 5 to 9 years: | 4,663 | | 10 to 14 years: | 4,643 | | 15 to 17 years: | 2,811 | | 18 and 19 years: | 1,654 | | 20 years: | 777 | | 21 years: | 795 | | 22 to 24 years: | 2,529 | | 25 to 29 years: | 4,513 | | 30 to 34 years: | 4,457 | | 35 to 39 years: | 4,161 | | 40 to 44 years: | 4,349 | | 45 to 49 years: | 4,822 | | 50 to 54 years: | 5,461 | | 55 to 59 years: | 5,097 | | 60 and 61 years: | 1,849 | | 62 to 64 years: | 2,476 | | 65 and 66 years: | 1,356 | | 67 to 69 years: | 1,930 | | 70 to 74 years: | 2,439 | | 75 to 79 years: | 1,782 | | 80 to 84 years: | 1,393 | | 85 years and over: | 1,031 | | Female Population: | 73,398 | | Under 5 years: | 4,608 | | 5 to 9 years: | 4,316 | | 10 to 14 years: | 4,480 | | 15 to 17 years: | 2,761 | | 18 and 19 years: | 1,625 | | 20 years: | 780 | | 21 years: | 867 | | 22 to 24 years: | 2,642 | | 25 to 29 years: | 4,626 | | 30 to 34 years: | 4,338 | | 35 to 39 years: | 4,254 | | 40 to 44 years: | 4,314 | | 45 to 49 years: | 5,112 | | 50 to 54 years: | 5,681 | | 55 to 59 years: | 5,301 | | 60 and 61 years: | 1,958 | | 62 to 64 years: | 2,712 | | 65 and 66 years: | 1,420 | | 67 to 69 years: | 2,062 | | 70 to 74 years: | 2,838 | | 75 to 79 years: | 2,380 | | 80 to 84 years: | 2,106 | | 85 years and over: | 2,217 |
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| Average household size in Rock Island County | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Rock Island County | | | Total: | 61,303 | | Family led homes: | 38,384 | | Husband-wife family: | 27,743 | | Other family: | 10,641 | | Population of male led with no wife present: | 2,850 | | Population female led with no husband present: | 7,791 | | Population of Nonfamily homes: | 22,919 | | Population living alone: | 19,392 | | Population not living alone: | 3,527 |
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| Total occupied homes in Rock Island County with people under 18 years old: | | | Total: | 61,303 | | Population of homes with one or more people under 18 years: | 17,767 | | Population of family homes: | 17,558 | | Husband-wife family: | 10,347 | | Under 6 years only: | 2,350 | | Under 6 years and 6 to 17 years: | 2,336 | | 6 to 17 years only: | 5,661 | | Other family: | 7,211 | | Male householder, no wife present: | 1,755 | | Under 6 years only: | 540 | | Under 6 years and 6 to 17 years: | 330 | | 6 to 17 years only: | 885 | | Female led with no husband present: | 5,456 | | Under 6 years only: | 1,496 | | Under 6 years and 6 to 17 years: | 1,184 | | 6 to 17 years only: | 2,776 | | Nonfamily households: | 209 | | Male led households: | 154 | | Under 6 years only: | 24 | | Under 6 years and 6 to 17 years: | 19 | | 6 to 17 years only: | 111 | | Female led householder: | 55 | | Under 6 years only: | 15 | | Under 6 years and 6 to 17 years: | 3 | | 6 to 17 years only: | 37 | | Households with no people under 18 years: | 43,536 | | Family households: | 20,826 | | Husband-wife family: | 17,396 | | Other family: | 3,430 | | Male led with no wife present: | 1,095 | | Female led with no husband present: | 2,335 | | Nonfamily households: | 22,710 | | Male led householder: | 10,638 | | Female led householder: | 12,072 |
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| Total number led homes in Rock Island County, by type | | | Total Home Population: | 61,303 | | Population of Family homes: | 38,384 | | Population of 15 to 24 year olds: | 1,433 | | Population of 25 to 34 year olds: | 6,139 | | Population of 35 to 44 year olds: | 7,086 | | Population of 45 to 54 year olds: | 8,066 | | Population of 55 to 59 year olds: | 3,979 | | Population of 60 to 64 year olds: | 3,468 | | Population of 65 to 74 year olds: | 4,796 | | Population of 75 to 84 year olds: | 2,663 | | Population of 85 year olds and over: | 754 | | Population of Nonfamily Homes: | 22,919 | | Population of 15 to 24 year olds: | 1,407 | | Population of 25 to 34 year olds: | 2,718 | | Population of 35 to 44 year olds: | 2,373 | | Population of 45 to 54 year olds: | 3,983 | | Population of 55 to 59 year olds: | 2,269 | | Population of 60 to 64 year olds: | 2,080 | | Population of 65 to 74 year olds: | 3,163 | | Population of 75 to 84 year olds: | 2,997 | | Population of 85 year olds and over: | 1,929 |
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| households in Rock Island County containing people over 60 | | | Total Population: | 61,303 | | Population of homes with one or more people 60 years and over: | 23,137 | | 1-person household: | 9,631 | | 2-or-more-person household: | 13,506 | | Family households: | 12,860 | | Nonfamily households: | 646 | | Population of homes with no people 60 years and over: | 38,166 | | 1-person household: | 9,761 | | 2-or-more-person household: | 28,405 | | Family homes: | 25,524 | | Nonfamily homes: | 2,881 |
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| homes in Rock Island County with multiple generations. | | | Total Population: | 61,303 | | Home has three or more generations: | 1,810 | | Home does not have three or more generations: | 59,493 |
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| Unmarried population in Rock Island County under 18 years old in homes | | | Total Population: | 33,098 | | Unmarried partner of home lead present: | 3,709 | | In family homes: | 3,478 | | Population of male led and male partner homes: | 77 | | Population of male led and female partner households: | 1,429 | | Population of female led and female partner households: | 103 | | Population of female led and male partner households: | 1,869 | | In nonfamily homes: | 231 | | Population of male led and male partner homes: | 5 | | Population of male led and female partner homes: | 190 | | Population of female led and female partner homes: | 11 | | Population of female led and male partner homes: | 25 | | No unmarried partner of home lead present: | 29,389 | | In family homes: | 29,314 | | Population of husband-wife family homes: | 19,867 | | Population of male lead with no wife present, family homes: | 1,450 | | Population of female lead with no husband present, family homes: | 7,997 | | In nonfamily homes: | 75 |
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| Population in families living in Rock Island County | | | Total Population: | 112,297 | | Population Under 18 years: | 32,452 | | Population 18 years and over: | 79,845 |
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| How long in Rock Island County have lived in one place. | | | Total: | 61,303 | | Population of Owner occupied homes: | 42,418 | | Family home: | 29,804 | | Nonfamily homess: | 12,614 | | Male led home: | 5,720 | | Living alone: | 4,549 | | Not living alone: | 1,171 | | Female led home: | 6,894 | | Living alone: | 6,166 | | Not living alone: | 728 | | Population of Renter occupied homes: | 18,885 | | Family run homes: | 8,580 | | Husband-wife family: | 3,569 | | Other family: | 5,011 | | Male led with no wife present: | 1,039 | | Female led with no husband present: | 3,972 | | Nonfamily Homes: | 10,305 | | Male led homes: | 5,072 | | Male living alone: | 4,129 | | Male not living alone: | 943 | | Female led homes: | 5,233 | | Females living alone: | 4,548 | | Females not living alone: | 685 |
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