Regional Directory  

O Fallon, Illinois Map and Directory


Regional Directory > States Menu > Illinois

Submit a Website
Submit a Website
Current Weather Conditions in O Fallon, Illinois
Source: Accuweather
St. Clair County, Illinois locator map According to the United States Census Bureau, O Fallon is a City that is located in St. Clair County, Illinois at 38.59 degrees North and 89.91 degrees West.  The city's time zone is America/Chicago, and the city's primary telephone area code is 618.  The land area of O Fallon is about 14.86 square miles, whereas the water area of the city is about 0.12 square miles. 

The Census Bureau estimates that O Fallon had about 29,069 residents in 2014, which is approximately 1,956 people per square mile of land area. 

The Illinois counties map at upper right shows St. Clair County, highlighted in red.  Use the menu below to display interactive maps of O Fallon, either in a frame on this page or in full-screen mode. 

Use the menu below to display categorized O Fallon directories. 

O Fallon Products and Services Directory

Nearby Illinois Cities and Towns *

Large and Mid-size Cities in Nearby States

* Parenthesized numbers indicate economic activity levels.

Copyright © 2011-2023  All rights reserved.

O Fallon, Illinois Regional Directory Categories Menu