Affton, MO Demographics

A map of Affton's Population by Race

Affton, Missouri has an estimated population of 19,052, a decrease from the 20,417 recorded in the 2020 Census. The population is 81.3% White, 7.5% Multiracial, 5.9% Hispanic, 3.0% Black, 2.1% Asian, and 0.2% Native American/Other. This demographic dot map shows the population of Affton, with one dot drawn for each person counted by the Census, color-coded by race.

Affton has become considerably more racially diverse since the 2020 Census. It is considerably less diverse than Missouri overall. Demographers use a diversity index to measure the probability that two randomly selected individuals belong to different racial or ethnic groups. In Affton, that probability was 27.2% in 2020 and 32.9% in the most recent ACS estimates.

Affton is ranked the 41st most populous place in Missouri, out of 1,082 places. This ranking is based on the Census definition of a place, which includes incorporated places like cities, towns, and villages, as well as unincorporated census-designated places (CDPs). Affton was ranked the 37th most populous place in the 2020 Census.

Affton's White Population

15,486 residents of Affton, or 81.3% of the population, identify as White. The share of White residents in Affton is slightly higher than in Missouri overall, where 76.3% of the population is White. Affton ranks 789th statewide in terms of White residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Affton's White population has declined by an estimated 10.8%. White residents' share of Affton's population has decreased from 85.0% to 81.3%.

Affton is more White than neighboring St. George (79.6% White), and Marlborough (72.9% White). Affton is less White than neighboring Lakeshire (84.7% White), Wilbur Park (82.9% White), and Grantwood Village (96.1% White).

Affton's Black Population

573 residents of Affton, or 3.0% of the population, identify as Black. The share of Black residents in Affton is lower than in Missouri overall, where 10.9% of the population is Black. Affton ranks 231st statewide in terms of Black residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Affton's Black population has remained roughly the same. Black residents' share of Affton's population has remained roughly unchanged at 3.0%.

Affton is more Black than neighboring Lakeshire (0.5% Black), Wilbur Park (0% Black), and Grantwood Village (0.8% Black). Affton is less Black than neighboring Marlborough (11.2% Black).

Affton's Asian Population

404 residents of Affton, or 2.1% of the population, identify as Asian. The share of Asian residents in Affton is comparable to the share in Missouri overall, where 2.1% of the population is Asian. Affton ranks 50th statewide in terms of Asian residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Affton's Asian population has declined by an estimated 44.3%. Asian residents' share of Affton's population has decreased from 3.6% to 2.1%.

Affton is more Asian than neighboring Lakeshire (0.3% Asian), Wilbur Park (1.8% Asian), and Grantwood Village (0.4% Asian). Affton is less Asian than neighboring St. George (5.8% Asian), and Marlborough (3.4% Asian).

Affton's Hispanic Population

1,131 residents of Affton, or 5.9% of the population, identify as Hispanic. The share of Hispanic residents in Affton is comparable to the share in Missouri overall, where 5.2% of the population is Hispanic. Affton ranks 324th statewide in terms of Hispanic residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Affton's Hispanic population has grown by an estimated 63.4%. Hispanic residents' share of Affton's population has increased from 3.4% to 5.9%.

Affton is more Hispanic than neighboring Wilbur Park (2.4% Hispanic), St. George (3.9% Hispanic), and Grantwood Village (0.6% Hispanic). Affton is less Hispanic than neighboring Lakeshire (7.4% Hispanic), and Marlborough (9.1% Hispanic).

Affton's Native American/Other Population

33 residents of Affton, or 0.2% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Affton is comparable to the share in Missouri overall, where 0.7% of the population is Native American/Other. Affton ranks 563rd statewide in terms of Native American/Other residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Affton's Native American/Other population has declined by an estimated 71.1%. Native American/Other residents' share of Affton's population has remained roughly unchanged at 0.2%.

Affton is more Native American/Other than neighboring Marlborough (0% Native American/Other). Affton is less Native American/Other than neighboring Lakeshire (0.4% Native American/Other), Wilbur Park (0.4% Native American/Other), and St. George (4.2% Native American/Other).

Affton's Multiracial Population

1,425 residents of Affton, or 7.5% of the population, identify as Multiracial. The share of Multiracial residents in Affton is slightly higher than in Missouri overall, where 4.8% of the population is Multiracial. Affton ranks 558th statewide in terms of Multiracial residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Affton's Multiracial population has grown by an estimated 50.6%. Multiracial residents' share of Affton's population has increased from 4.6% to 7.5%.

Affton is more Multiracial than neighboring Lakeshire (6.8% Multiracial), St. George (3.4% Multiracial), Marlborough (3.3% Multiracial), and Grantwood Village (2% Multiracial). Affton is less Multiracial than neighboring Wilbur Park (12.4% Multiracial).

Sources: Most recent population estimates are from the 2020-2024 American Community Survey 5-Year Estimates. 2020 population counts and map data are from 2020 Census State Redistricting Data. Geographic data are from Census TIGER/Line Shapefiles.