Lake St. Louis city, Missouri Demographics & Population 2026
As of 2026, Lake St. Louis city, Missouri has a total population of 17,538, the 48th largest city in Missouri, with a median household income of $123,427, which is 79% higher than the state average. The poverty rate is 4.0%.
Key Takeaways
- Household income is 79% above the state average — one of the wealthiest communities in Missouri.
- An exceptionally low poverty rate of 4.0% — among the lowest in Missouri.
- 49.5% of adults hold a bachelor's degree or higher — top 10% in Missouri.
Lake St. Louis city Quick Facts
How Lake St. Louis city Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A less diverse community where one racial or ethnic group represents a large majority.
State average: 39 | National average: 60
Education
Educational Attainment (Adults 25+)
Lake St. Louis city Rankings in Missouri
Explore Missouri Rankings
Other Cities in St. Louis city
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| St. Louis city | 293,109 | $55,279 | 19.8% | $185,100 |
Cities Similar to Lake St. Louis city
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Clayton city | 17,282 | $128,898 | $799,200 | 83.8% | 8.1% |
| Creve Coeur city | 18,643 | $119,454 | $566,100 | 66.7% | 6.3% |
| Manchester city | 18,189 | $92,839 | $298,400 | 62.1% | 5.7% |
| Concord CDP | 18,028 | $84,389 | $279,400 | 42.0% | 4.3% |
| Old Jamestown CDP | 21,121 | $107,250 | $230,100 | 39.5% | 6.1% |
Population Overview
Lake St. Louis city is a small city located in Missouri, within St. Louis city. The total population is 17,538. It ranks as the 48th most populous out of 1,062 cities and towns in Missouri.
Age Demographics
The median age in Lake St. Louis city is 43.2 years. This is 11% higher than the state median of 38.9 years.
Economy, Income & Housing
The median household income in Lake St. Louis city is $123,427. This is 79% higher than the state median of $68,920. Compared to the national median of $78,538, household income here is 57% higher. The poverty rate stands at 4.0%. This is 68% lower than the state poverty rate of 12.6%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The unemployment rate is 4.5%. This is 8% higher than the state rate of 4.1%. The median home value is $375,300. Housing costs are 74% higher than the state median of $215,600. The home-value-to-income ratio is 3.0x. 75.2% of occupied housing units are owner-occupied. This homeownership rate is 11% higher than the state average of 67.9%.
Race & Ethnicity
Lake St. Louis city has a predominantly White (non-Hispanic) population, comprising 86.7% of all residents. Black or African American residents account for 4.2%. The Black or African American population (4.2%) is well below the state average of 11.0%.
Education
49.5% of residents aged 25 and older hold a bachelor's degree or higher. This places Lake St. Louis city in the top 10% of all cities in the state for educational attainment. This is 55% higher than the state rate of 31.9%. Nationally, 35.0% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 97.2%. Notably, 17.1% of adults hold a graduate or professional degree, indicating a highly educated workforce.
Data Sources & Methodology
All demographic data for Lake St. Louis city, Missouri is sourced from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates (2019-2023). The ACS collects data from approximately 3.5 million households annually, providing reliable estimates for communities of all sizes. Comparisons are made against Missouri state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,062 Census-designated places in Missouri. For official data, visit data.census.gov.
Free data download: Get all Missouri city and county demographics as CSV. Download Cities CSV | Download Counties CSV
Frequently Asked Questions
What is the population of Lake St. Louis city, Missouri?
Lake St. Louis city, Missouri has a population of 17,538 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Lake St. Louis city, MO?
The median household income in Lake St. Louis city is $123,427, which is 57% higher the national median of $78,538.
What is the poverty rate in Lake St. Louis city, MO?
The poverty rate in Lake St. Louis city is 4.0%. This means approximately 711 residents live below the federal poverty line.
What is the racial makeup of Lake St. Louis city, Missouri?
Lake St. Louis city's population is 86.7% White, 4.2% Black, 2.8% Hispanic/Latino, and 1.5% Asian.
What is the median home value in Lake St. Louis city, MO?
The median home value in Lake St. Louis city is $375,300. The home-value-to-income ratio is 3.0x.
How educated is Lake St. Louis city, Missouri?
49.5% of adults (25+) in Lake St. Louis city hold a bachelor's degree or higher, and 17.1% hold a graduate or professional degree.