Population

96,101

US Census estimate, July 2025

Median home value

$326,200

Owner-occupied units

O'Fallon, MO

Missouri · 38.779° N, 90.722° W · 31 sq mi

O'Fallon is a city in Missouri, with a population of 96,101 and about 3,101 residents per square mile. The median household earns $110,443 a year, and the median home is worth $326,200.

Conditions

Humidity & wind

—

UV index

—

Sunrise & sunset

—

Local time

—

Size & density

Land area

31 sq mi

Water excluded

Population density

3,101

People per square mile

Rank by population

#379

Of cities on this site

Rank by area

#447

Of cities on this site

Money & housing

Median household income

$110,443

US median ≈ $78,538

Median gross rent

$1,443

Per month

Homeownership

81%

US ≈ 65%

Average commute

25.5 min

One way

People

Median age

38.4

US median 39.1

Bachelor's degree +

43.3%

Age 25 and over

Foreign born

6.3%

Households

35,471

2.63 people each

What people here do for work

Education & health care 22.1^%

Manufacturing 11.8^%

Professional & business services 11.5^%

Finance, insurance & real estate 11.4^%

Top four industries · share of all workers · ACS 2024

Wealthiest person in Missouri

Name

David Steward

Forbes, Apr 2025

Net worth

$11.4B

As of 25 Apr 2025 — not live

Lives in

St. Louis

Source of wealth

IT services

Compiled from public reporting, not from an official dataset, and not independently verified.

Largest employer in Missouri · private sector

Employer

BJC HealthCare

Sector

Healthcare

Compiled from public reporting, not from an official dataset, and not independently verified. Government employers are excluded.

Largest public company in Missouri

Company

Centene

Revenue

$163.1B

Fiscal year 2024

Headquarters

St. Louis

Ticker

CNC

Compiled from public reporting, not from an official dataset, and not independently verified.

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State of Missouri

State bird

Eastern Bluebird

State flower

White Hawthorn Blossom

State capital

Jefferson City

Nickname

The Show-Me State

Compare O'Fallon with

Cities near O'Fallon

St. Peters, MO6 mi · 61,479
St. Charles, MO11 mi · 72,561
Florissant, MO21 mi · 51,124
St. Louis, MO28 mi · 278,144
Columbia, MO87 mi · 130,851
Springfield, IL91 mi · 112,989
Decatur, IL121 mi · 67,884
Peoria, IL148 mi · 110,920