Population Demographics for Alton, Illinois in 2020, 2019 
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  |   | Male | Female | Total |  | Total Population | 13,325 | 14,540 | 27,865 |  | White | 9,171 | 9,911 | 19,082 |  | Black or African American | 3,492 | 3,929 | 7,421 |  | Two or More Races | 494 | 526 | 1,020 |  | Hispanic or Latino | 273 | 263 | 536 |  | Asian | 54 | 86 | 140 |  | Some Other Race | 73 | 61 | 134 |  
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  |  Total population in Alton |   |  | Total Population: | 27,865 |  | Male Population: | 13,325 |  | Female Population: | 14,540 |  
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  |  Median age in Alton |   |  | Both sexes | 36 |  | Male | 34 |  | Female | 37 |  
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  |  Population in households in Alton |   |  | Total Population: | 27,347 |  | Male Population: | 13,062 |  | Under 5 years: | 1,065 |  | 5 to 9 years: | 998 |  | 10 to 14 years: | 868 |  | 15 to 17 years: | 531 |  | 18 and 19 years: | 363 |  | 20 years: | 164 |  | 21 years: | 174 |  | 22 to 24 years: | 569 |  | 25 to 29 years: | 1,069 |  | 30 to 34 years: | 889 |  | 35 to 39 years: | 788 |  | 40 to 44 years: | 819 |  | 45 to 49 years: | 912 |  | 50 to 54 years: | 982 |  | 55 to 59 years: | 811 |  | 60 and 61 years: | 260 |  | 62 to 64 years: | 363 |  | 65 and 66 years: | 185 |  | 67 to 69 years: | 264 |  | 70 to 74 years: | 333 |  | 75 to 79 years: | 294 |  | 80 to 84 years: | 207 |  | 85 years and over: | 154 |  | Female Population: | 14,285 |  | Under 5 years: | 959 |  | 5 to 9 years: | 899 |  | 10 to 14 years: | 830 |  | 15 to 17 years: | 539 |  | 18 and 19 years: | 344 |  | 20 years: | 210 |  | 21 years: | 178 |  | 22 to 24 years: | 697 |  | 25 to 29 years: | 1,186 |  | 30 to 34 years: | 960 |  | 35 to 39 years: | 862 |  | 40 to 44 years: | 760 |  | 45 to 49 years: | 1,006 |  | 50 to 54 years: | 1,008 |  | 55 to 59 years: | 900 |  | 60 and 61 years: | 317 |  | 62 to 64 years: | 438 |  | 65 and 66 years: | 241 |  | 67 to 69 years: | 345 |  | 70 to 74 years: | 461 |  | 75 to 79 years: | 418 |  | 80 to 84 years: | 348 |  | 85 years and over: | 379 |  
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  |  Average household size in Alton |   |  | Total: | 2 |  | Under 18 years: | 0 |  | 18 years and over: | 1 |  
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  |  Number of occupied homes in Alton |   |  | Total: | 11,734 |  | Family led homes: | 6,854 |  | Husband-wife family: | 3,951 |  | Other family: | 2,903 |  | Population of male led with no wife present: | 652 |  | Population female led with no husband present: | 2,251 |  | Population of Nonfamily homes: | 4,880 |  | Population living alone: | 4,037 |  | Population not living alone: | 843 |  
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  |  Total occupied homes in Alton with people under 18 years old: |   |  | Total: | 11,734 |  | Population of homes with one or more people under 18 years: | 3,537 |  | Population of family homes: | 3,482 |  | Husband-wife family: | 1,561 |  | Under 6 years only: | 411 |  | Under 6 years and 6 to 17 years: | 352 |  | 6 to 17 years only: | 798 |  | Other family: | 1,921 |  | Male householder, no wife present: | 382 |  | Under 6 years only: | 143 |  | Under 6 years and 6 to 17 years: | 59 |  | 6 to 17 years only: | 180 |  | Female led with no husband present: | 1,539 |  | Under 6 years only: | 391 |  | Under 6 years and 6 to 17 years: | 372 |  | 6 to 17 years only: | 776 |  | Nonfamily households: | 55 |  | Male led households: | 33 |  | Under 6 years only: | 13 |  | Under 6 years and 6 to 17 years: | 1 |  | 6 to 17 years only: | 19 |  | Female led householder: | 22 |  | Under 6 years only: | 5 |  | Under 6 years and 6 to 17 years: | 3 |  | 6 to 17 years only: | 14 |  | Households with no people under 18 years: | 8,197 |  | Family households: | 3,372 |  | Husband-wife family: | 2,390 |  | Other family: | 982 |  | Male led with no wife present: | 270 |  | Female led with no husband present: | 712 |  | Nonfamily households: | 4,825 |  | Male led householder: | 2,281 |  | Female led householder: | 2,544 |  
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  |  Total number led homes in Alton, by type |   |  | Total Home Population: | 11,734 |  | Population of Family homes: | 6,854 |  | Population of 15 to 24 year olds: | 344 |  | Population of 25 to 34 year olds: | 1,421 |  | Population of 35 to 44 year olds: | 1,339 |  | Population of 45 to 54 year olds: | 1,445 |  | Population of 55 to 59 year olds: | 605 |  | Population of 60 to 64 year olds: | 502 |  | Population of 65 to 74 year olds: | 646 |  | Population of 75 to 84 year olds: | 425 |  | Population of 85 year olds and over: | 127 |  | Population of Nonfamily Homes: | 4,880 |  | Population of 15 to 24 year olds: | 349 |  | Population of 25 to 34 year olds: | 721 |  | Population of 35 to 44 year olds: | 548 |  | Population of 45 to 54 year olds: | 884 |  | Population of 55 to 59 year olds: | 494 |  | Population of 60 to 64 year olds: | 413 |  | Population of 65 to 74 year olds: | 637 |  | Population of 75 to 84 year olds: | 534 |  | Population of 85 year olds and over: | 300 |  
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  |  households in Alton containing people over 60 |   |  | Total Population: | 11,734 |  | Population of homes with one or more people 60 years and over: | 3,839 |  | 1-person household: | 1,769 |  | 2-or-more-person household: | 2,070 |  | Family households: | 1,937 |  | Nonfamily households: | 133 |  | Population of homes with no people 60 years and over: | 7,895 |  | 1-person household: | 2,268 |  | 2-or-more-person household: | 5,627 |  | Family homes: | 4,917 |  | Nonfamily homes: | 710 |  
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  |  homes in Alton with multiple generations. |   |  | Total Population: | 11,734 |  | Home has three or more generations: | 483 |  | Home does not have three or more generations: | 11,251 |  
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  |  Unmarried population in Alton under 18 years old in homes |   |  | Total Population: | 6,677 |  | Unmarried partner of home lead present: | 927 |  | In family homes: | 887 |  | Population of male led and male partner homes: | 12 |  | Population of male led and female partner households: | 316 |  | Population of female led and female partner households: | 32 |  | Population of female led and male partner households: | 527 |  | In nonfamily homes: | 40 |  | Population of male led and male partner homes: | 0 |  | Population of male led and female partner homes: | 31 |  | Population of female led and female partner homes: | 1 |  | Population of female led and male partner homes: | 8 |  | No unmarried partner of home lead present: | 5,750 |  | In family homes: | 5,718 |  | Population of husband-wife family homes: | 3,002 |  | Population of male lead with no wife present, family homes: | 320 |  | Population of female lead with no husband present, family homes: | 2,396 |  | In nonfamily homes: | 32 |  
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  |  Population in families living in Alton |   |  | Total Population: | 20,551 |  | Population Under 18 years: | 6,510 |  | Population 18 years and over: | 14,041 |  
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  |  How long in Alton have lived in one place. |   |  | Total: | 11,734 |  | Population of Owner occupied homes: | 7,033 |  | Family home: | 4,592 |  | Nonfamily homess: | 2,441 |  | Male led home: | 1,149 |  | Living alone: | 921 |  | Not living alone: | 228 |  | Female led home: | 1,292 |  | Living alone: | 1,097 |  | Not living alone: | 195 |  | Population of Renter occupied homes: | 4,701 |  | Family run homes: | 2,262 |  | Husband-wife family: | 714 |  | Other family: | 1,548 |  | Male led with no wife present: | 259 |  | Female led with no husband present: | 1,289 |  | Nonfamily Homes: | 2,439 |  | Male led homes: | 1,165 |  | Male living alone: | 934 |  | Male not living alone: | 231 |  | Female led homes: | 1,274 |  | Females living alone: | 1,085 |  | Females not living alone: | 189 |  
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