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 2026 population of 20,345. Lake St. Louis is currently growing at a rate of 3% annually and its population has increased by 21.18% since the most recent census, which recorded a population of 16,789 in 2020.

The median household income in Lake St. Louis is $125,693 with a poverty rate of 4.35%. The median age in Lake St. Louis is 42.7 years: 40.9 years for males, and 44.2 years for females. For every 100 females there are 102.2 males.

20.3K
Total Population
2,382
Density (mi²)
593 3%
Growth

Lake St. Louis Population

Lake St. Louis Population

Data after 2023 is projected based on recent change

Year ↓
Population
Growth
Annual Change
202620,3455933%
202519,7525923.09%
202419,1604492.4%
202318,7113762.05%
202218,3351,0185.88%
202117,3176103.65%
202016,789-57-0.34%
201916,8466423.96%
201816,2042851.79%
201715,9191981.26%
201615,7213902.54%
201515,3313202.13%
201415,0111771.19%
201314,834820.56%
201214,7521030.7%
201114,649420.29%
201014,607620.43%
200010,1692,76937.42%
19907,4003,55792.56%
19803,84300%

Median Age

Overall: 42.7 years
Female: 44.2 years
Male: 40.9 years

Lake St. Louis Adults

There are 14,442 adults, (3,712 of whom are seniors) in Lake St. Louis.

Sex Ratio

Female: 8,935 (49.5%)
Male: 9,131 (50.5%)

Demographics

The racial composition of Lake St. Louis includes 85.39% White, 5.53% Black or African American, and smaller percentages for Asian, other race, Native American and multiracial populations.

Population by Race

Race
Population ↓
Percentage (of total)
White15,42785.39%
Two or more races1,1046.11%
Black or African American9995.53%
Asian3431.9%
Other race1700.94%
Native American230.13%
Race
Population ↓
Percentage (of total)
Two or more races2351.3%
White1240.69%
Other race640.35%
Native American160.09%
Black or African American140.08%
Race
Population ↓
Percentage (of total)
White15,30384.71%
Black or African American9855.45%
Two or more races8694.81%
Asian3431.9%
Other race1060.59%
Native American70.04%

Lake St. Louis Marital Status

Economics and Income Statistics

Lake St. Louis ' average per capita income is $74,659. Household income levels show a median of $125,693. The poverty rate stands at 4.35%.

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$160,682-
Families$151,417$177,360
Households$125,693$155,073
Non Families$56,711$89,050

$74,659

Average Income

$125,693

Median Household Income

4.35%

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)