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Affton is an unincorporated inner-ring suburb of St. Louis, located in St. Louis County, Missouri. Its population at the 2010 census was 20,307.
Even till the 1930s, Affton was a small town with a population under 1000. It was disincorporated in 1935 and has remained the same till now. In the last few decades, the library has been remodeled. A number of new buildings have been constructed. Addtions have also been made to the local school.
The population predominantly comprises White Americans.
| Label | Estimate | Margin of Error | Percent | Percent Margin of Error |
 SEX AND AGE |
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| Total population |
18,925 | ±1,057 | 18,925% | (x) |
| Male | 9,655 | ±659 | 51% | ±2 |
| Female | 9,270 | ±670 | 49% | ±2 |
| Sex ratio (males per 100 females) | 104 | ±9 | (x) | (x) |
| Under 5 years | 925 | ±197 | 5% | ±1 |
| 5 to 9 years | 1,133 | ±316 | 6% | ±2 |
| 10 to 14 years | 699 | ±177 | 4% | ±1 |
| 15 to 19 years | 742 | ±164 | 4% | ±1 |
| 20 to 24 years | 1,314 | ±300 | 7% | ±2 |
| 25 to 34 years | 2,737 | ±426 | 15% | ±2 |
| 35 to 44 years | 2,737 | ±495 | 15% | ±2 |
| 45 to 54 years | 2,291 | ±340 | 12% | ±2 |
| 55 to 59 years | 1,373 | ±227 | 7% | ±1 |
| 60 to 64 years | 1,440 | ±286 | 8% | ±2 |
| 65 to 74 years | 1,981 | ±271 | 11% | ±1 |
| 75 to 84 years | 884 | ±247 | 5% | ±1 |
| 85 years and over | 669 | ±181 | 4% | ±1 |
| Median age (years) | 43 | ±3 | (x) | (x) |
| Under 18 years | 3,223 | ±424 | 17% | ±2 |
| 16 years and over | 16,076 | ±911 | 85% | ±2 |
| 18 years and over | 15,702 | ±915 | 83% | ±2 |
| 21 years and over | 15,240 | ±848 | 81% | ±2 |
| 62 years and over | 4,373 | ±453 | 23% | ±2 |
| 65 years and over | 3,534 | ±385 | 19% | ±2 |
| 18 years and over |
15,702 | ±915 | 15,702% | (x) |
| Male | 7,792 | ±585 | 50% | ±2 |
| Female | 7,910 | ±586 | 50% | ±2 |
| Sex ratio (males per 100 females) | 99 | ±9 | (x) | (x) |
| 65 years and over |
3,534 | ±385 | 3,534% | (x) |
| Male | 1,543 | ±235 | 44% | ±5 |
| Female | 1,991 | ±270 | 56% | ±5 |
| Sex ratio (males per 100 females) | 78 | ±14 | (x) | (x) |
| RACE |
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| Total population |
18,925 | ±1,057 | 18,925% | (x) |
| One race | 18,084 | ±976 | 96% | ±2 |
| Two or more races | 841 | ±311 | 4% | ±2 |
| One race |
18,084 | ±976 | 96% | ±2 |
| White | 16,846 | ±989 | 89% | ±3 |
| Black or African American | 569 | ±320 | 3% | ±2 |
| American Indian and Alaska Native |
14 | ±23 | 0% | ±0 |
| Cherokee tribal grouping | 0 | ±19 | 0% | ±0 |
| Chippewa tribal grouping | 0 | ±19 | 0% | ±0 |
| Navajo tribal grouping | 0 | ±19 | 0% | ±0 |
| Sioux tribal grouping | 0 | ±19 | 0% | ±0 |
| Asian |
433 | ±282 | 2% | ±2 |
| Asian Indian | 0 | ±19 | 0% | ±0 |
| Chinese | 109 | ±96 | 1% | ±1 |
| Filipino | 144 | ±180 | 1% | ±1 |
| Japanese | 0 | ±19 | 0% | ±0 |
| Korean | 0 | ±19 | 0% | ±0 |
| Vietnamese | 180 | ±183 | 1% | ±1 |
| Other Asian | 0 | ±19 | 0% | ±0 |
| Native Hawaiian and Other Pacific Islander |
0 | ±19 | 0% | ±0 |
| Native Hawaiian | 0 | ±19 | 0% | ±0 |
| Chamorro | 0 | ±19 | 0% | ±0 |
| Samoan | 0 | ±19 | 0% | ±0 |
| Other Pacific Islander | 0 | ±19 | 0% | ±0 |
| Some other race | 222 | ±216 | 1% | ±1 |
| Two or more races |
841 | ±311 | 4% | ±2 |
| White and Black or African American | 113 | ±87 | 1% | ±1 |
| White and American Indian and Alaska Native | 187 | ±81 | 1% | ±0 |
| White and Asian | 239 | ±203 | 1% | ±1 |
| Black or African American and American Indian and Alaska Native | 0 | ±19 | 0% | ±0 |
| Race alone or in combination with one or more other races |
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| Total population |
18,925 | ±1,057 | 18,925% | (x) |
| White | 17,687 | ±1,068 | 94% | ±2 |
| Black or African American | 687 | ±315 | 4% | ±2 |
| American Indian and Alaska Native | 206 | ±87 | 1% | ±1 |
| Asian | 672 | ±411 | 4% | ±2 |
| Native Hawaiian and Other Pacific Islander | 0 | ±19 | 0% | ±0 |
| Some other race | 519 | ±322 | 3% | ±2 |
| HISPANIC OR LATINO AND RACE |
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| Total population |
18,925 | ±1,057 | 18,925% | (x) |
| Hispanic or Latino (of any race) |
643 | ±358 | 3% | ±2 |
| Mexican | 99 | ±107 | 1% | ±1 |
| Puerto Rican | 87 | ±110 | 1% | ±1 |
| Cuban | 0 | ±19 | 0% | ±0 |
| Other Hispanic or Latino | 457 | ±321 | 2% | ±2 |
| Not Hispanic or Latino |
18,282 | ±1,034 | 97% | ±2 |
| White alone | 16,538 | ±970 | 87% | ±3 |
| Black or African American alone | 536 | ±317 | 3% | ±2 |
| American Indian and Alaska Native alone | 14 | ±23 | 0% | ±0 |
| Asian alone | 433 | ±282 | 2% | ±2 |
| Native Hawaiian and Other Pacific Islander alone | 0 | ±19 | 0% | ±0 |
| Some other race alone | 0 | ±19 | 0% | ±0 |
| Two or more races |
761 | ±289 | 4% | ±1 |
| Two races including Some other race | 222 | ±209 | 1% | ±1 |
| Two races excluding Some other race, and Three or more races | 539 | ±217 | 3% | ±1 |
| Total housing units | 9,021 | ±471 | (x) | (x) |
| CITIZEN, VOTING AGE POPULATION |
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| Citizen, 18 and over population |
15,238 | ±900 | 15,238% | (x) |
| Male | 7,515 | ±588 | 49% | ±3 |
| Female | 7,723 | ±597 | 51% | ±3 |
