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O'Fallon, MO

City in St. Charles County, Missouri. ZIP codes: 63366, 63367, 63368.

Population

93,801

Land area

30.6sq mi

People per sq mi

3,070

ZIP codes

3

O'Fallon and its ZIP codes

Full map

O'Fallon at a glance

  • O'Fallon is about 34 times as dense as Missouri as a whole.
  • It is the 7th most populous of 1,062 cities and towns in Missouri.
  • Households here earn a median of $110,443 a year, 56% more than the Missouri figure of $70,702.
  • A typical owner-occupied home is valued at $326,200 (42% above Missouri) and median rent is $1,443 a month.

Local data for O'Fallon, MO

Counts from official public data

Housing and community stats

O'Fallon, MO, American Community Survey 2020-2024

Full profile

Median household income

$110,443

Poverty rate

5.4%

Median home value

$326,200

Median rent

$1,443/mo

Homeownership

81.0%

Bachelor's or higher

43.3%

Median age

38.4

Average commute

25.5 min

Largest reported origins and ancestries: German Americans (26,662), Irish Americans (14,432), Italian Americans (6,466).

Home values and rentsIncome, education and commute

Economy and federal money

Jobs, pay, income and spending are for St. Charles County. PPP loans are for O'Fallon.

Details

Unemployment rate

3.3%

Aug 2026, -0.3 pts in a year

Average annual pay

$62,680

162,655 jobs, 2025

Income per person

$71,954

BEA, 2024

Federal spending

$2.53B

FY 2026, $6,244 per person

St. Charles County economyFederal spending

How people get to work

O'Fallon, MO, workers 16 and older. American Community Survey 5-year estimates

  • Drove alone75.2%
  • Carpooled4.3%
  • Public transit0.1%
  • Walked0.8%
  • Bicycle0.0%
  • Taxi, ride-hailing, motorcycle or other1.4%
  • Worked from home18.1%

Average one-way commute: 25.5 minutes for people who do not work from home.

Environment and hazard risk

O'Fallon, MO, from FEMA, NOAA and EPA

Full report

Natural hazard risk

Relatively Moderate

Top: strong wind

Storm events since 1996

865

Countywide, mostly thunderstorm wind

Flood insurance policies

1,076

0.8% of homes, county

July high / Jan low

88° / 21°F

44.4 inches of rain a year

Hazards, floods and storm historyCheck a flood zone

Health statistics

Share of adults in O'Fallon, MO, CDC PLACES estimates

All 40 measures

Obesity

35.9%

U.S. 33.3% +2.6 pts

Diabetes

9.8%

U.S. 12.1% -2.3 pts

Smoking

12.9%

U.S. 12.8% about the same

Uninsured (18-64)

6.5%

U.S. 11.1% -4.6 pts

ZIP codes in O'Fallon

3 in or overlapping O'Fallon. Population shown

·

Cities near O'Fallon

NameDistanceLand area (sq mi)
Dardenne PrairieCity1.3 mi5.3
Lake St. LouisCity3.3 mi8.5
JosephvilleVillage4.3 mi2.9
CottlevilleCity4.4 mi4.7
St. PaulCity4.5 mi7.2
St. PetersCity5.3 mi22.5
Weldon Spring HeightsTown6.2 mi0.1
WentzvilleCity6.6 mi21.7
Weldon SpringCity6.7 mi7.6
Flint HillCity8.8 mi2.7
New MelleCity9.3 mi1.7
Chain of RocksVillage9.6 mi0.2
Old MonroeCity11 mi0.4
DefianceCensus-designated place11 mi1
ChesterfieldCity12 mi31.8
St. CharlesCity12 mi25.2

Frequently asked questions

What county is O'Fallon, MO in?
O'Fallon is in St. Charles County, Missouri.
What ZIP codes are in O'Fallon, MO?
ZIP codes in or overlapping O'Fallon include 63366, 63367, 63368.
What is the population of O'Fallon, MO?
About 93,801 people live in O'Fallon, based on American Community Survey 5-year estimates.
What cities are near O'Fallon?
Nearby places include Dardenne Prairie (1.3 mi), Lake St. Louis (3.3 mi), Josephville (4.3 mi), Cottleville (4.4 mi), St. Paul (4.5 mi).

Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023