Lake St. Louis, MO Demographics

A map of Lake St. Louis's Population by Race

Lake St. Louis, Missouri has an estimated population of 18,066, an increase from the 16,707 recorded in the 2020 Census. The population is 84.7% White, 5.5% Black, 4.8% Multiracial, 2.5% Hispanic, 1.9% Asian, and 0.6% Native American/Other. This demographic dot map shows the population of Lake St. Louis, with one dot drawn for each person counted by the Census, color-coded by race.

Lake St. Louis is about as racially diverse as it was in 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 Lake St. Louis, that probability was 27.2% in 2020 and 27.6% in the most recent ACS estimates.

Lake St. Louis is ranked the 47th 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). Lake St. Louis was ranked the 52nd most populous place in the 2020 Census.

Lake St. Louis's White Population

15,303 residents of Lake St. Louis, or 84.7% of the population, identify as White. The share of White residents in Lake St. Louis is higher than in Missouri overall, where 76.3% of the population is White. Lake St. Louis ranks 792nd statewide in terms of White residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Lake St. Louis's White population has grown by an estimated 7.7%. White residents' share of Lake St. Louis's population has remained roughly unchanged at 84.7%.

Lake St. Louis is more White than neighboring Josephville (84% White), O'Fallon (79.5% White), and Wentzville (84.2% White). Lake St. Louis is less White than neighboring Dardenne Prairie (85.1% White), and St. Paul (92.1% White).

Lake St. Louis's Black Population

985 residents of Lake St. Louis, or 5.5% of the population, identify as Black. The share of Black residents in Lake St. Louis is lower than in Missouri overall, where 10.9% of the population is Black. Lake St. Louis ranks 179th statewide in terms of Black residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Lake St. Louis's Black population has grown by an estimated 36.8%. Black residents' share of Lake St. Louis's population has increased from 4.3% to 5.5%.

Lake St. Louis is more Black than neighboring Dardenne Prairie (3.4% Black), O'Fallon (5.2% Black), and St. Paul (1.6% Black). Lake St. Louis is less Black than neighboring Josephville (13.1% Black), and Wentzville (6.6% Black).

Lake St. Louis's Asian Population

343 residents of Lake St. Louis, or 1.9% of the population, identify as Asian. The share of Asian residents in Lake St. Louis is comparable to the share in Missouri overall, where 2.1% of the population is Asian. Lake St. Louis ranks 81st statewide in terms of Asian residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Lake St. Louis's Asian population has declined by an estimated 14.2%. Asian residents' share of Lake St. Louis's population has decreased from 2.4% to 1.9%.

Lake St. Louis is more Asian than neighboring Josephville (0.2% Asian), St. Paul (0.2% Asian), and Wentzville (1.6% Asian). Lake St. Louis is less Asian than neighboring Dardenne Prairie (5.6% Asian), and O'Fallon (4.8% Asian).

Lake St. Louis's Hispanic Population

453 residents of Lake St. Louis, or 2.5% of the population, identify as Hispanic. The share of Hispanic residents in Lake St. Louis is slightly lower than in Missouri overall, where 5.2% of the population is Hispanic. Lake St. Louis ranks 357th statewide in terms of Hispanic residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Lake St. Louis's Hispanic population has declined by an estimated 14.5%. Hispanic residents' share of Lake St. Louis's population has decreased from 3.2% to 2.5%.

Lake St. Louis is more Hispanic than neighboring Josephville (0% Hispanic), and St. Paul (1.2% Hispanic). Lake St. Louis is less Hispanic than neighboring Dardenne Prairie (3.3% Hispanic), O'Fallon (5.5% Hispanic), and Wentzville (3.3% Hispanic).

Lake St. Louis's Native American/Other Population

113 residents of Lake St. Louis, or 0.6% of the population, identify as American Indian/Alaska Native/Native Hawaiian/Pacific Islander/Other. The share of Native American/Other residents in Lake St. Louis is comparable to the share in Missouri overall, where 0.7% of the population is Native American/Other. Lake St. Louis ranks 528th statewide in terms of Native American/Other residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Lake St. Louis's Native American/Other population has grown by an estimated 7.6%. Native American/Other residents' share of Lake St. Louis's population has remained roughly unchanged at 0.6%.

Lake St. Louis is more Native American/Other than neighboring Josephville (0% Native American/Other), Dardenne Prairie (0% Native American/Other), St. Paul (0% Native American/Other), and Wentzville (0.5% Native American/Other).

Lake St. Louis's Multiracial Population

869 residents of Lake St. Louis, or 4.8% of the population, identify as Multiracial. The share of Multiracial residents in Lake St. Louis is comparable to the share in Missouri overall, where 4.8% of the population is Multiracial. Lake St. Louis ranks 588th statewide in terms of Multiracial residents as a share of the population, out of 1,082 places.

Since the 2020 Census, Lake St. Louis's Multiracial population has grown by an estimated 16.0%. Multiracial residents' share of Lake St. Louis's population has remained roughly unchanged at 4.8%.

Lake St. Louis is more Multiracial than neighboring Josephville (2.7% Multiracial), Dardenne Prairie (2.6% Multiracial), O'Fallon (4.3% Multiracial), and Wentzville (3.8% 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.