O'Fallon is a city in St. Charles County, Missouri, home to about 93,801 people across 30 square miles. Its ZIP codes are 63366 and 63368, and parts of 63304, 63367, 63376 and 63385 are in O'Fallon too.
Homes sold for a median of $179 per square foot across 2 ZIP codes in the three months ending August 2026, and all of them were seller’s markets.
Mostly O'Fallon; also St. Paul
Mostly O'Fallon; also Dardenne Prairie
Part is in O'Fallon, part in St. Peters and Weldon Spring
Mostly Lake St. Louis; part is in O'Fallon
Mostly St. Peters; part is in O'Fallon
Mostly Wentzville; part is in O'Fallon
Each card is that ZIP code’s whole market, including any part outside O'Fallon. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up O'Fallon’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)20 miles away |
|---|---|
| Nearest city of 250,000+ | St. Louis, MO28 miles away |
| Nearest city of 1 million+ | Chicago, IL264 miles away |
Straight-line distances from the center of O'Fallon; 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.
O'Fallon had 91,316 residents in the 2020 census, up 98% since 2000.
It’s the 7th 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 (7 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).
890 doctors and other health care providers list an office in O'Fallon’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 78 |
|---|---|
| Specialist doctors | 84 |
| Dentists | 89 |
| Nurse practitioners and physician assistants | 148 |
| Mental health providers | 189 |
| Physical and occupational therapists | 193 |
| Optometrists | 26 |
| Chiropractors | 83 |
| Pharmacies | 25 |
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 (18 nearby)
Grocery stores (8 nearby)
Pharmacies (5 nearby)
Libraries (3 nearby)
Theaters and performance venues (1 nearby)
Counts are within about 3.5 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 1856.
Notable people born here
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Wentzville R-IV, Francis Howell R-III, Fort Zumwalt School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Barfield Early Childhood CntrO'Fallon | Pre-K | 356 | Public | 2.2 mi |
| Discovery Ridge ElementaryO'Fallon | Pre-K–5 | 590 | Public | 4.3 mi |
| John Weldon Elem.Dardenne Prairie | Pre-K–5 | 640 | Public | 4.8 mi |
| Crossroads Elem.Dardenne Prairie | K–5 | 757 | Public | 2.3 mi |
| Dardenne Elem.O'Fallon | K–5 | 445 | Public | 2.3 mi |
| Emge Elem.O'Fallon | K–5 | 348 | Public | 2.9 mi |
| Joseph L. Mudd Elem.O'Fallon | K–2 | 412 | Public | 2.6 mi |
| Mike Clemens Center Adapt LrngO'Fallon | K–12 | — | Alternative Education | 3.3 mi |
| Mount Hope Elem.O'Fallon | K–5 | 444 | Public | 3.0 mi |
| Ostmann Elem.O'Fallon | K–5 | 362 | Public | 2.4 mi |
| Pheasant Point Elem.O'Fallon | K–5 | 428 | Public | 3.9 mi |
| Prairie View Elem.O'Fallon | K–5 | 696 | Public | 2.1 mi |
| Rock Creek Elem.O'Fallon | K–5 | 408 | Public | 0.9 mi |
| St. Peters Elem.St Peters | K–2 | 384 | Public | 5.9 mi |
| Twin Chimneys Elem.O'Fallon | K–5 | 488 | Public | 2.2 mi |
| Westhoff Elem.O'Fallon | K–5 | 534 | Public | 3.3 mi |
| Forest Park Elem.O'Fallon | 3–5 | 436 | Public | 2.8 mi |
| Frontier MiddleO'Fallon | 6–8 | 1,243 | Public | 4.6 mi |
| Ft. Zumwalt North MiddleO'Fallon | 6–8 | 1,019 | Public | 2.0 mi |
| Ft. Zuwmalt West MiddleO'Fallon | 6–8 | 1,114 | Public | 3.8 mi |
| Francis Howell Union HighO'Fallon | 9–12 | — | Alternative Education | 5.3 mi |
| Ft. Zumwalt Hope HighO'Fallon | 9–12 | — | Alternative Education | 1.7 mi |
| Ft. Zumwalt North HighO'Fallon | 9–12 | 1,538 | Public | 3.8 mi |
| Ft. Zumwalt West HighO'Fallon | 9–12 | 1,643 | Public | 0.4 mi |
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| Assumption Catholic SchoolO'Fallon | Pre-K–8 | 374 | Roman Catholic | 2.0 mi |
| Christian School DistrictO'Fallon | Pre-K–12 | 596 | Christian (no specific denomination) | 3.7 mi |
| Christian School DistrictO'Fallon | Pre-K–12 | 596 | Christian (no specific denomination) | 3.7 mi |
| First Baptist Christian AcademyO'Fallon | Pre-K–8 | 163 | Baptist | 1.6 mi |
| Immaculate Conception SchoolDardenne Prairie | Pre-K–8 | 715 | Roman Catholic | 2.3 mi |
| Oakhaven Montessori SchoolDardenne Prairie | Pre-K–6 | 34 | Nonsectarian | 2.1 mi |
| St Paul Elementary SchoolSaint Paul | Pre-K–8 | 222 | Roman Catholic | 4.7 mi |
| St Dominic High SchoolO'Fallon | 9–12 | 1,087 | Roman Catholic | 1.0 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 St. Peters, Wentzville, Lake St. Louis, Dardenne Prairie, Weldon Spring, Cottleville, St. Paul, Josephville, Flint Hill, New Melle and Weldon Spring Heights.
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.