The Town FilesLake St. Louis, Missouri
City in St. Charles County · population 16,707 (2020 Census)
- Median home
- $405,900
- Household income
- $125,693
- Jan low / Jul high
- 21° / 88°
- Snow a year
- 14 in
- Tornadoes ≤10 mi since 1950
- 26
- Median age
- 42.7
Lake St. Louis is a city of 16,707 people in St. Charles County, Missouri. The median home is worth $405,900, above the typical Missouri town ($153,900). It ranks more upscale than 93% of Missouri towns, more of a college town than 92% of Missouri towns, better for young professionals than 88% of Missouri towns.
How Lake St. Louis ranks
Percentile among Missouri towns with at least 500 people on The Town Files lifestyle rankings. 50 is typical for the state; 90 means better than 90% of Missouri towns.
Homes and cost of living
The median home in Lake St. Louis is worth $405,900, above the typical Missouri town ($153,900). Homes cost about 3.2 times the median household income of $125,693, which is more affordable than 28% of Missouri towns. Median rent is $1,588 a month. 75.6% of households own their home.
| Housing | Lake St. Louis | Typical Missouri town |
|---|---|---|
| Median home value | $405,900 | $153,900 |
| Median rent | $1,588 | $855 |
| Median household income | $125,693 | $56,368 |
| Home value ÷ income | 3.2× | 2.7× |
| Homeownership | 75.6% | 67.4% |
| Median year built | 2000 | 1972 |
| Seasonal / vacation homes | 0.0% | — |
Who lives in Lake St. Louis
| People | Lake St. Louis | Typical Missouri town |
|---|---|---|
| Median age | 42.7 | 38.6 |
| Age 65 and over | 20.5% | 17.7% |
| Under 18 | 20.1% | — |
| Bachelor's degree or higher | 51.7% | 18.9% |
| Below the poverty line | 4.3% | 14.6% |
| Veterans | 8.7% | — |
| Born outside the U.S. | 4.0% | — |
| Work from home | 21.9% | 7.9% |
| Average commute | 25.6 min | 23.1 min |
| Homes with broadband | 98.3% | 88.7% |
Weather in Lake St. Louis
July highs average 87.5°F and January lows 21.2°F. About 44.4 inches of rain and melted snow fall a year, with 13.5 inches of snow (typical Missouri town: 11.1 in). Expect about 36 days a year at 90°F or hotter and 105 nights at or below freezing.
Tornadoes, storms and disasters
26 tornadoes have passed within 10 miles of Lake St. Louis since 1950, compared with 23 for the typical Missouri town. 9 rated (E)F2 or stronger. The strongest, an EF3, struck on December 10, 2021 about 9.0 miles from the town center and killed 1. Tornadoes within 10 miles have caused 1 deaths and 61 injuries since 1950. The most recent was on November 4, 2024.
Hail of 1 inch or larger has been reported within 10 miles 140 times; the largest was 3.00 inches on March 14, 2024.
Severe weather in St. Charles County since 1996
St. Charles County has been included in 28 federal disaster or emergency declarations since 1953, most often for flood, drought, tornado.
| Declared | Incident | Declaration |
|---|---|---|
| August 8, 2022 | Flood | DR-4665: Severe Storms And Flooding |
| March 26, 2020 | Biological | DR-4490: Covid-19 Pandemic |
| March 13, 2020 | Biological | EM-3482: Covid-19 |
| July 9, 2019 | Severe Storm | DR-4451: Severe Storms, Tornadoes, And Flooding |
| January 21, 2016 | Flood | DR-4250: Severe Storms, Tornadoes, Straight-Line Winds, And Flooding |
Jobs and pay in St. Charles County
St. Charles County had 162,611 jobs in 2024, paying an average of $60,105 a year. Unemployment was 2.5% in 2023; in Lake St. Louis itself the ACS puts it at 4.7%.
Public schools in Lake St. Louis
3 public schools with 2,944 students, about 16.2 students per teacher.
| School | Grades | Students | Per teacher |
|---|---|---|---|
| LIBERTY HIGH SCHOOL | 9-12 | 1,669 | 18.1 |
| DUELLO ELEM. | K-5 | 647 | 14.4 |
| GREEN TREE ELEM. | K-5 | 628 | 14.0 |
Towns near Lake St. Louis
- O'Fallon, MO3.4 mi · 91,316 people · home $326,200
- Dardenne Prairie, MO4.6 mi · 12,743 people · home $432,000
- Wentzville, MO5.2 mi · 44,372 people · home $331,300
- St. Paul, MO5.3 mi · 3,005 people · home $443,600
- Cottleville, MO7.2 mi · 5,611 people · home $435,400
- Weldon Spring, MO8.7 mi · 5,326 people · home $544,300
- St. Peters, MO9.8 mi · 57,732 people · home $269,900
- Moscow Mills, MO13.6 mi · 3,317 people · home $196,400
Lake St. Louis questions
Is Lake St. Louis, Missouri a good place to retire?
On The Town Files lifestyle rankings, Lake St. Louis scores better for retirees than 75% of Missouri towns and quieter than 22%. 20.5% of residents are 65 or older (median age 42.7).
How much does a house cost in Lake St. Louis?
The median owner-occupied home in Lake St. Louis is valued at $405,900 (Census ACS 2020–2024), against a median household income of $125,693, so homes cost about 3.2 times income. Median rent is $1,588 a month.
What is the weather like in Lake St. Louis?
July highs average 87.5°F and January lows 21.2°F (NOAA 1991–2020 normals). It gets about 44.4 inches of precipitation a year and 13.5 inches of snow.
Does Lake St. Louis get tornadoes?
26 tornadoes have passed within 10 miles of Lake St. Louis since 1950 (NOAA Storm Events); the strongest was an EF3 on December 10, 2021. The typical Missouri town has had 23.
- U.S. Census Bureau, American Community Survey 5-year estimates (2020–2024)
- U.S. Census Bureau, 2020 Census and 2025 Gazetteer (2020 / 2025)
- NOAA NCEI U.S. Climate Normals (1991–2020)
- NOAA NCEI Storm Events Database (1950–2026)
- FEMA OpenFEMA Disaster Declarations (this product uses the FEMA OpenFEMA API but is not endorsed by FEMA) (1953–2026)
- NCES Common Core of Data (2023–24)
- BLS Quarterly Census of Employment and Wages; USDA ERS county unemployment (BLS LAUS) (2000–2024)
- The Town Files lifestyle rankings, built from federal demographic, school, crime and housing data (2025)