Lake St. Louis is a city in St. Charles County, Missouri, home to about 18,066 people across 8.5 square miles. Its ZIP code is 63367.
Homes sold for a median of $183 per square foot in the three months ending August 2026, a seller’s market.
Mostly Lake St. Louis; also O'Fallon
Each card is that ZIP code’s whole market, including any part outside Lake St. Louis. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Lake St. Louis’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | St. Louis Lambert International Airport (STL)23 miles away |
|---|---|
| Nearest city of 250,000+ | St. Louis, MO31 miles away |
| Nearest city of 1 million+ | Chicago, IL266 miles away |
Straight-line distances from the center of Lake St. Louis; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Lake St. Louis had 16,707 residents in the 2020 census, up 64% since 2000.
It’s the 47th largest of 1,060 towns in Missouri by population.
St. Charles County grew from 24,474 residents in 1900 to 405,262 in 2020.
St. Charles County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 88°F in summer, and winter lows average 21°F. About 44.4 inches of rain and melted snow fall in a typical year, with about 14 inches of snow.
Source: NOAA 1991–2020 climate normals, Weldon Spring Nws, MO weather station (9 miles away).
143,624 jobs at 8,946 businesses in St. Charles County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
300 doctors and other health care providers list an office in Lake St. Louis.
Nearest hospitals
Providers with an office here
| Primary care doctors | 30 |
|---|---|
| Specialist doctors | 52 |
| Dentists | 9 |
| Nurse practitioners and physician assistants | 52 |
| Mental health providers | 76 |
| Physical and occupational therapists | 66 |
| Optometrists | 2 |
| Chiropractors | 13 |
| Pharmacies | 7 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (5 nearby)
Grocery stores (4 nearby)
Pharmacies (1 nearby)
Libraries (1 nearby)
Theaters and performance venues
Counts are within about 2 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Established in 1961.
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Wentzville R-IV. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Discovery Ridge ElementaryO'Fallon | Pre-K–5 | 590 | Public | 3.1 mi |
| Duello Elem.Lake St Louis | K–5 | 625 | Public | 2.5 mi |
| Green Tree Elem.Lake St Louis | K–5 | 640 | Public | 1.0 mi |
| Liberty High SchoolLake St. Louis | 9–12 | 1,647 | Public | 2.5 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Hope Montessori Academy, Lake St LouisLake Saint Louis | Pre-K–K | 8 | Nonsectarian | 1.6 mi |
| Stem and Bloom AcademyLake Saint Louis | Pre-K–1 | 1 | Nonsectarian | 1.0 mi |
| Andrews AcademyLake Saint Louis | K–8 | 123 | Nonsectarian | 1.7 mi |
| Lafayette AcademyLake Saint Louis | K–12 | 77 | Nonsectarian | 1.6 mi |
| Lighthouse International: An Acton AcademyLake Saint Louis | K–9 | 15 | Nonsectarian | 1.8 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with O'Fallon.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.