Lake St. Louis Flag

Lake St. Louis

County Seat:
No
Area (mi²):
8.54
State:
Missouri

Lake St. Louis is a city located in St. Charles County, Missouri. Lake St. Louis has a 2025 population of 19,910. Lake St. Louis is currently growing at a rate of 3.24% annually and its population has increased by 18.6% since the most recent census, which recorded a population of 16,787 in 2020.

The average household income in Lake St. Louis is $148,931 with a poverty rate of 4.05%.The median age in Lake St. Louis is 43.2 years: 41.7 years for males, and 44.7 years for females.

19.9K
Total Population
2,331
Density (mi²)
625 3.24%
Growth

Lake St. Louis Population

Lake St. Louis Population

Data after 2023 is projected based on recent change

Demographics

The racial composition of Lake St. Louis includes 87.57% White, 4.24% Black or African American, and smaller percentages for Asian, other race, Native American and multiracial populations.

Population by Race

Race
Population
Percentage (of total)
White15,35887.57%
Two or more races9755.56%
Black or African American7444.24%
Asian2731.56%
Other race1781.01%
Native American100.06%

Lake St. Louis Marital Status

OverallMalesFemales0%10%20%30%40%50%60%70%80%90%100%

Married

Widowed

Divorced

Separated

Never Married

Economics and Income Statistics

Lake St. Louis' average per capita income is $73,744. Household income levels show a median of $123,427. The poverty rate stands at 4.05%.

Families: A family includes the owner or renter of the home along with everyone related to them - whether through birth, marriage, or adoption. This includes relatives like spouses, children, parents, siblings, grandparents, and any other family members.
Households: A household includes all the people who occupy a housing unit (such as a house or apartment) as their usual place of residence.
Non Families: A nonfamily household is either someone living alone or when the owner/renter lives with people they aren't related to, like roommates.
Name
Median
Mean
Married Families$157,753-
Families$151,721$174,546
Households$123,427$148,931
Non Families$53,474$74,883

$73,744

Average Income

$123,427

Median Household Income

4.05%

Poverty Rate

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)