Population Demographics for Rock Island, Illinois in 2020, 2019
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| | Male | Female | Total | | Total Population | 18,717 | 20,301 | 39,018 | | White | 13,504 | 14,720 | 28,224 | | Black or African American | 3,339 | 3,783 | 7,122 | | Hispanic or Latino | 1,872 | 1,792 | 3,664 | | Two or More Races | 716 | 734 | 1,450 | | Some Other Race | 762 | 661 | 1,423 | | Asian | 345 | 342 | 687 | | American Indian | 46 | 58 | 104 | | Three or more races | 53 | 50 | 103 |
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| Total population in Rock Island | | | Total Population: | 39,018 | | Male Population: | 18,717 | | Female Population: | 20,301 |
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| Median age in Rock Island | | | Both sexes | 37 | | Male | 35 | | Female | 38 |
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| Population in households in Rock Island | | | Total Population: | 36,577 | | Male Population: | 17,572 | | Under 5 years: | 1,318 | | 5 to 9 years: | 1,206 | | 10 to 14 years: | 1,183 | | 15 to 17 years: | 677 | | 18 and 19 years: | 382 | | 20 years: | 190 | | 21 years: | 238 | | 22 to 24 years: | 769 | | 25 to 29 years: | 1,220 | | 30 to 34 years: | 1,180 | | 35 to 39 years: | 1,044 | | 40 to 44 years: | 1,074 | | 45 to 49 years: | 1,192 | | 50 to 54 years: | 1,289 | | 55 to 59 years: | 1,259 | | 60 and 61 years: | 446 | | 62 to 64 years: | 575 | | 65 and 66 years: | 292 | | 67 to 69 years: | 413 | | 70 to 74 years: | 570 | | 75 to 79 years: | 417 | | 80 to 84 years: | 342 | | 85 years and over: | 296 | | Female Population: | 19,005 | | Under 5 years: | 1,286 | | 5 to 9 years: | 1,152 | | 10 to 14 years: | 1,170 | | 15 to 17 years: | 705 | | 18 and 19 years: | 385 | | 20 years: | 205 | | 21 years: | 297 | | 22 to 24 years: | 818 | | 25 to 29 years: | 1,215 | | 30 to 34 years: | 1,234 | | 35 to 39 years: | 1,058 | | 40 to 44 years: | 1,031 | | 45 to 49 years: | 1,235 | | 50 to 54 years: | 1,441 | | 55 to 59 years: | 1,344 | | 60 and 61 years: | 490 | | 62 to 64 years: | 609 | | 65 and 66 years: | 328 | | 67 to 69 years: | 509 | | 70 to 74 years: | 651 | | 75 to 79 years: | 629 | | 80 to 84 years: | 556 | | 85 years and over: | 657 |
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| Average household size in Rock Island | | | Total: | 2 | | Under 18 years: | 0 | | 18 years and over: | 1 |
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| Number of occupied homes in Rock Island | | | Total: | 15,930 | | Family led homes: | 9,211 | | Husband-wife family: | 6,056 | | Other family: | 3,155 | | Population of male led with no wife present: | 725 | | Population female led with no husband present: | 2,430 | | Population of Nonfamily homes: | 6,719 | | Population living alone: | 5,592 | | Population not living alone: | 1,127 |
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| Total occupied homes in Rock Island with people under 18 years old: | | | Total: | 15,930 | | Population of homes with one or more people under 18 years: | 4,478 | | Population of family homes: | 4,431 | | Husband-wife family: | 2,282 | | Under 6 years only: | 551 | | Under 6 years and 6 to 17 years: | 560 | | 6 to 17 years only: | 1,171 | | Other family: | 2,149 | | Male householder, no wife present: | 440 | | Under 6 years only: | 139 | | Under 6 years and 6 to 17 years: | 85 | | 6 to 17 years only: | 216 | | Female led with no husband present: | 1,709 | | Under 6 years only: | 445 | | Under 6 years and 6 to 17 years: | 422 | | 6 to 17 years only: | 842 | | Nonfamily households: | 47 | | Male led households: | 33 | | Under 6 years only: | 6 | | Under 6 years and 6 to 17 years: | 3 | | 6 to 17 years only: | 24 | | Female led householder: | 14 | | Under 6 years only: | 2 | | Under 6 years and 6 to 17 years: | 2 | | 6 to 17 years only: | 10 | | Households with no people under 18 years: | 11,452 | | Family households: | 4,780 | | Husband-wife family: | 3,774 | | Other family: | 1,006 | | Male led with no wife present: | 285 | | Female led with no husband present: | 721 | | Nonfamily households: | 6,672 | | Male led householder: | 3,144 | | Female led householder: | 3,528 |
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| Total number led homes in Rock Island, by type | | | Total Home Population: | 15,930 | | Population of Family homes: | 9,211 | | Population of 15 to 24 year olds: | 405 | | Population of 25 to 34 year olds: | 1,647 | | Population of 35 to 44 year olds: | 1,679 | | Population of 45 to 54 year olds: | 1,843 | | Population of 55 to 59 year olds: | 968 | | Population of 60 to 64 year olds: | 756 | | Population of 65 to 74 year olds: | 1,053 | | Population of 75 to 84 year olds: | 647 | | Population of 85 year olds and over: | 213 | | Population of Nonfamily Homes: | 6,719 | | Population of 15 to 24 year olds: | 471 | | Population of 25 to 34 year olds: | 831 | | Population of 35 to 44 year olds: | 727 | | Population of 45 to 54 year olds: | 1,206 | | Population of 55 to 59 year olds: | 677 | | Population of 60 to 64 year olds: | 620 | | Population of 65 to 74 year olds: | 822 | | Population of 75 to 84 year olds: | 799 | | Population of 85 year olds and over: | 566 |
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| households in Rock Island containing people over 60 | | | Total Population: | 15,930 | | Population of homes with one or more people 60 years and over: | 5,787 | | 1-person household: | 2,637 | | 2-or-more-person household: | 3,150 | | Family households: | 2,946 | | Nonfamily households: | 204 | | Population of homes with no people 60 years and over: | 10,143 | | 1-person household: | 2,955 | | 2-or-more-person household: | 7,188 | | Family homes: | 6,265 | | Nonfamily homes: | 923 |
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| homes in Rock Island with multiple generations. | | | Total Population: | 15,930 | | Home has three or more generations: | 516 | | Home does not have three or more generations: | 15,414 |
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| Unmarried population in Rock Island under 18 years old in homes | | | Total Population: | 8,689 | | Unmarried partner of home lead present: | 1,013 | | In family homes: | 963 | | Population of male led and male partner homes: | 15 | | Population of male led and female partner households: | 336 | | Population of female led and female partner households: | 43 | | Population of female led and male partner households: | 569 | | In nonfamily homes: | 50 | | Population of male led and male partner homes: | 2 | | Population of male led and female partner homes: | 38 | | Population of female led and female partner homes: | 5 | | Population of female led and male partner homes: | 5 | | No unmarried partner of home lead present: | 7,676 | | In family homes: | 7,653 | | Population of husband-wife family homes: | 4,547 | | Population of male lead with no wife present, family homes: | 390 | | Population of female lead with no husband present, family homes: | 2,716 | | In nonfamily homes: | 23 |
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| Population in families living in Rock Island | | | Total Population: | 27,376 | | Population Under 18 years: | 8,538 | | Population 18 years and over: | 18,838 |
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| How long in Rock Island have lived in one place. | | | Total: | 15,930 | | Population of Owner occupied homes: | 10,272 | | Family home: | 6,778 | | Nonfamily homess: | 3,494 | | Male led home: | 1,566 | | Living alone: | 1,240 | | Not living alone: | 326 | | Female led home: | 1,928 | | Living alone: | 1,710 | | Not living alone: | 218 | | Population of Renter occupied homes: | 5,658 | | Family run homes: | 2,433 | | Husband-wife family: | 833 | | Other family: | 1,600 | | Male led with no wife present: | 272 | | Female led with no husband present: | 1,328 | | Nonfamily Homes: | 3,225 | | Male led homes: | 1,611 | | Male living alone: | 1,300 | | Male not living alone: | 311 | | Female led homes: | 1,614 | | Females living alone: | 1,342 | | Females not living alone: | 272 |
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