Lake St. Louis, Missouri Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Lake St. Louis, Missouri is 17,538 as of the 2023 American Community Survey, making it the 48th-largest city in Missouri. The median household income is $123,427, the median home value is $375,300, and the median age is 43.2.
The population has grown 31.2% since 2010 (14,608 → 19,160).
17,538
Population
2052
People / sq mi
$123,427
Median Income
$375,300
Median Home Value
Lake St. Louis covers 8.5 sq mi of land at 2052 people per square mile.
About Lake St. Louis, MO
Lake St. Louis is a city in Missouri with a population of 17,538. It ranks #48 among cities in Missouri by population. The median age is 43.2, older than the national median. The population is 49.6% male and 50.4% female.
The median household income in Lake St. Louis is $123,427, above the US median of $74,580. 4.4% of residents live below the federal poverty level. Home values sit at a median of $375,300, with monthly rent averaging $1,608. The homeownership rate of 75.2% is higher than the national rate of 64.8%.
Educational attainment in Lake St. Louis reflects 49.5% of adults 25 and older holding a bachelor's degree or higher, above the national average of 34.3%. Roughly 18.3% of workers primarily work from home, noticeably above the national work-from-home rate of 14.2%. The average commute is 26.8 minutes each way.
Lake St. Louis city Population History (2010-2024)
The city of Lake St. Louis city had a population of 14,608 in 2010 and 19,160 in 2024, a 31.2% growth over 14 years. The peak was 19,160 in 2024. Average annual growth rate: 1.97%.
19,160
Population (2024)
14,608
Population (2010)
19,160
Peak (2024)
1.97%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 14,608 |
| 2011 | 14,647 |
| 2012 | 14,748 |
| 2013 | 14,831 |
| 2014 | 15,008 |
| 2015 | 15,327 |
| 2016 | 15,716 |
| 2017 | 15,921 |
| 2018 | 16,215 |
| 2019 | 16,864 |
| 2020 | 16,789 |
| 2021 | 17,317 |
| 2022 | 18,335 |
| 2023 | 18,711 |
| 2024 | 19,160 |
Race & Ethnicity
| White | 87.6% |
| Black or African American | 4.2% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.1% |
| Two or More Races | 0.0% |
Economy & Income
$123,427
Median Household Income
$60,780
Per Capita Income
4.4%
Poverty Rate
3.0%
Unemployment Rate
Housing
$375,300
Median Home Value
$1,608
Median Rent
75.2%
Owner-Occupied
Education
97.2%
High School+
49.5%
Bachelor's+
Commute
0.0%
Drive Alone
75.3%
Public Transit
18.3%
Work From Home
26.8 min
Avg Commute
Community Profile
29.8%
Foreign Born
95.2%
Non-English at Home
9.1%
Veterans
11.6%
With Disability
96.9%
Health Insurance
98.3%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 18.4% |
| Finance, Insurance & Real Estate | 16.0% |
| Information | 13.7% |
| Manufacturing | 8.7% |
| Education, Health Care & Social Services | 7.4% |
| Construction | 7.1% |
| Arts, Entertainment & Food Services | 4.7% |
| Retail Trade | 2.6% |
| Public Administration | 2.4% |
| Transportation & Warehousing | 1.5% |
| Agriculture & Mining | 0.9% |
Largest cities in Missouri
Largest counties in Missouri
Part of Missouri
Metro areas in Missouri
City rankings
Frequently Asked Questions
Lake St. Louis, Missouri has a population of 17,538 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 48th-largest city in Missouri.
The median household income in Lake St. Louis, Missouri is $123,427, with 4.4% of residents living below the federal poverty level.
The median home value in Lake St. Louis, Missouri is $375,300, with median monthly rent at $1,608 and a homeownership rate of 75.2%.
The median age in Lake St. Louis, Missouri is 43.2 years. The population is 49.6% male and 50.4% female.
The population has grown 31.2% since 2010 (14,608 → 19,160).
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Statewide data for Missouri
Population, race, income, age, and trends across Missouri
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.