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O'Fallon

A city of 93,801 people in Missouri
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About O'Fallon

City in Missouri, United States
1856Established
91,316Population
29.7 sq miArea
541 ftElevation

O'Fallon ( oh-FAL-ən) is a city in St. Charles County, Missouri, United States. It is part of the St. Louis metropolitan statistical area, along Interstates 64 and 70 between Lake St. Louis and St. Peters. As of the 2020 census, O'Fallon had a population of 91,316, making it St. Louis's most populous suburb as well as the most populous municipality in St. Charles County and the 7th-most populous in Missouri. O'Fallon's namesake in St. Clair County, Illinois, is also part of the St. Louis region. The two cities are one of the few pairs of same-named municipalities to be part of the same metro area.

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From Wikipedia, licensed CC BY-SA 4.0 · facts via Wikidata (CC0)

Town numbers

ZIP code63366, 63368
Area code636
Living in O'Fallon

Housing in O'Fallon

$380K▲ 1.7% in a year Typical home value · Zillow

The typical O'Fallon home is worth about $380,000, up 1.7% in a year, 42% above the Missouri typical home.

A strong seller's market

Buyer’sBalancedSeller’s
Days on market8
Sale-to-list101.3%
Sold in May110
Zillow Home Value Index · Redfin Data CenterHousing market →

Safety in O'Fallon

A−

Safety Grade A-

O'Fallon reports less crime per resident than 80% of the U.S. towns and cities we grade.

Violent crime per 1,000
O'Fallon 1
Missouri 4.3
U.S. 3.3
Property crime per 1,000
O'Fallon 5.2
Missouri 16.9
U.S. 15.5
FBI crime data, 2025 · crimes reported to policeCrime & safety →

Schools in O'Fallon

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A

School Grade A

The public schools O'Fallon’s kids attend, from kindergarten through graduation, outperform 89% of Missouri’s districts on state tests and graduation. Among towns with similar incomes, they rank near the top.

#26Best public schoolsof 226 in MO
DistrictFORT ZUMWALT SCHOOL DISTRICTSchools28

School data from the U.S. Department of Education (NCES, EDFacts). The School Grade is our own summary of state test results and graduation rates, graded within MO. Ratings are from neighbors.

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O'Fallon

Missouri · MO
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Boundary source: https://tigerweb.geo.census.gov/arcgis/rest/services/TIGERweb/Places_CouSub_ConCity_SubMCD/MapServer/18 · 2025-01-01