O'Fallon
In St. Clair County, Illinois — population 29,606 as of 2020.
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This Afternoon
83°F
Slight Chance Showers And Thunderstorms17% precip
Tonight
68°F
Slight Chance Showers And Thunderstorms then Patchy Fog19% precip
Saturday
91°F
Patchy Fog then Mostly Sunny7% precip
Saturday Night
69°F
Partly Cloudy10% precip
In and around O'Fallon
See & do
- 24 Hour Fitness Zone
- Ansley Oaks Apartments
- Archview Terrace
- Braeswood Private Lake
- Joseph Arthur Middle School
Eat, drink & stay
+174 more on the mapShops & services
+282 more on the mapEverything else
- 10th Planet Jiu Jitsu O'Fallon
- 1st Source Contractors620 S Lincoln Ave
- 1st Source Contractors1560 Frontage Rd
- 2MG
- 88 Keys Academy
Musicians & bands near O'Fallon →
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O'Fallon by the numbers
Population
29,606Population figure, 2020
Households & income
- Area
- 15.76 sq mi (40.81 km²), 0.11 sq mi water
- Median age
- 37.8
- Households
- 12,816
- Persons per household
- 2.5
- Median household income
- $105,982
- Median house value
- $295,700
Municipal office
- Office
- CITY ADMINISTRATOR
- Address
- 255 S LINCOLN AVE, O FALLON, IL 62269
Photo:
Robert Lawton · CC BY-SA 2.5