Census place 2940043

Lake St. Louis

A Census profile of the people, homes, and daily patterns that shape this place.

Official Census name: Lake St. Louis city

Relocation snapshot

What stands out in Lake St. Louis.

According to the 2025 estimate, Lake St. Louis has a population of 19,129 and 2,233 residents per square mile. Of the six relocation measures evaluated, the three largest relative differences from the median among 81 covered Missouri places are: median home value is $405,900, above the comparison median of $218,700; median household income is $125,693, above the comparison median of $68,840; and median gross rent is $1,588, above the comparison median of $1,083. These unweighted medians compare covered Census places and are not statewide estimates.

median home value: $405,900
median household income: $125,693
median gross rent: $1,588

National context

Follow the metrics.

Compare Lake St. Louis's values with other covered Census places. Rankings are descriptive, not recommendations.

At a glance

A city in numbers.

Population: 19,129
Annual change: +0.1%
Density: 2,233/sq mi
Median age: 42.7 years

Living here

The everyday equation.

Households, homes, education, and the time it takes to get around.

Median household income: $125,693
Median home value: $405,900
Median gross rent: $1,588
Bachelor’s degree or higher: 51.7%
Typical commute: 25.6 min
Drive-alone commute: 71.3%
Public transit commute: 0%
Walked to work: 0.5%

Housing

Who rents, and what it takes.

Renter share and rent burden help describe the housing choices visible in this place.

Renter-occupied homes: 24.4%
Renters paying 30%+ of income: 32.5%

Work

How the workday lands.

Employment status and working-from-home share add context to income and commuting patterns.

Employed residents 16+: 63.2%
Unemployed residents 16+: 3.1%
Working from home: 21.9%

Community

The everyday infrastructure.

Access, mobility, housing growth, and household composition add another layer to a place's day-to-day picture.

Households with broadband: 98.3%
Homes built 2020+: 9.8%
Households without a vehicle: 2.1%
Households with children: 28.4%
Residents with a disability: 10.8%
Residents without insurance: 3.5%

Environmental context

A record of declared events.

FEMA declarations for St. Charles County provide historical context, not a forecast or a property-level risk assessment.

Environmental declarations since 2000: 16
Severe Storm declarations: 7
Flood declarations: 5
Severe Ice Storm declarations: 3

Climate normals

The long view of weather.

Thirty-year averages, not a forecast. Temperature and precipitation describe the typical conditions recorded from 1991 through 2020.

Representative station: ST LOUIS SPIRIT OF ST LOUIS AP (11 mi from place center)

Average high: 67.1°F
Average low: 45.1°F
Annual rainfall: 39.8"
Annual snowfall: 0"

Month by month

A year in Lake St. Louis.

Typical high and low °F

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Typical precipitation inches

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Data vintage

Population is from the 2025 Population Estimates Program. Household, housing, education, and commute data are from the 2020-2024 American Community Survey 5-year release. Disaster declarations are from FEMA's OpenFEMA dataset and are refreshed with this edition.

Population estimates ACS profile TIGERweb boundary NOAA climate normals FEMA declarations

Similar places

More places to consider.

Selected by the closest mix of population, density, median home value, and average annual high.

Clemson, SC

Population, housing, work, and travel data for this Census place.

Population: 18,941
Median home: $398,400

Springboro, OH

Population, housing, work, and travel data for this Census place.

Population: 19,606
Median home: $357,800

Mokena, IL

Population, housing, work, and travel data for this Census place.

Population: 19,897
Median home: $401,400

Keep exploring

Compare Lake St. Louis with Clemson →