O'Fallon, Illinois
O'Fallon: township in St.
About
O'Fallon is a township located in the county of Saint Clair in the U.S. state of Illinois. Its population at the 2010 census was 28,281 and a population density of 790 people per km². After 10 years in 2020 city had an estimated population of 29,606 inhabitants.
Quick Facts about O'Fallon
| Population | 29,606 (2020) |
| Country | United States of America |
| State | Illinois (United States) |
| County | Saint Clair County |
| Area | 35.78 km2 |
| Latitude & Longitude | 38.5923,-89.9112 |
| Time Zone | America/Chicago |
| Local time | 19:10:22 (14th April 2026) |
| Density | 827 Pop. per km² as of 2020 |
| Population growth | 4.48% (2010-2020) |
| Weather | 82℉ Chance Showers And Thunderstorms 7-days weather |
Geography
O'Fallon is located at 38°35'32"N 89°54'40"W (38.5922700, -89.9112100).
O'Fallon map
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Weather
A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms between 7am and 1pm, then a chance of showers and thunder...
7-Day ForecastDemographics
The population of O'Fallon increased by 4.48% in 10 years.
| Year | Population | % Change | Method |
|---|---|---|---|
| 2010 | 28,281 | - | census |
| 2011 | 29,423 | 3.88% | estimation process |
| 2012 | 29,328 | -0.32% | estimation process |
| 2013 | 29,224 | -0.36% | estimation process |
| 2014 | 29,151 | -0.25% | estimation process |
| 2015 | 29,124 | -0.09% | estimation process |
| 2016 | 29,199 | 0.26% | estimation process |
| 2017 | 29,364 | 0.56% | estimation process |
| 2018 | 29,602 | 0.8% | estimation process |
| 2019 | 29,621 | 0.06% | estimation process |
| 2020 | 29,606 | -0.05% | estimation process |
Services and Civic Places in O'Fallon
1City of O'Fallon
255 S Lincoln Ave, O'Fallon, IL 62269 View details
Phone: +16186244500 | Website available
Nearby Schools and Colleges
Schools and campuses linked to O'Fallon, IL. Select a name to open its map and contact details.
| Code | Name | City | ZIP |
|---|---|---|---|
| 147013 | McKendree University | Lebanon (IL) | 62254-1291 |
Nearby Transit Stations (9)
Rail and bus stations connected to O'Fallon, IL. Select a station to open its map and address details.
| Code | Name | Address | Type |
|---|---|---|---|
| STL | Gateway Transportation Center | 551 South 16th St. | RAIL |
| ALN | Alton | 3400 College Ave. | RAIL |
| KWD | Kirkwood | 110 West Argonne Dr. | RAIL |
| CEN | Centralia station | 108 East Broadway | RAIL |
| CRV | Carlinville | 128 Alton Rd. | RAIL |
Closest post offices linked to O'Fallon.
| Post Office Name | City | ZIP |
|---|---|---|
| O Fallon Post Office | O Fallon (IL) | 62269 |
Other places with the same name (1)
- O'Fallon, Missouri The most populous city in St. with a population of 89,769 people.
Other cities in Saint Clair County
Cities, towns, neighborhoods & other populated places in Saint Clair County , IL. (more)
| City Name | Population | Title |
|---|---|---|
| Belleville | 40,536 | The county seat of St. |
| East Saint Louis | 25,776 | City in St. |
| Crest Hill | 20,209 | City in Will County, Illinois |
| Fairview Heights | 16,127 | City in Saint Clair County, Illinois, United States |
| Cahokia | 13,742 | Village in St. |
| Shiloh | 13,653 | Town in St. |
| Swansea | 13,276 | Village in St. |
| Pontiac | 11,176 | City in Illinois, USA |
| Summit | 10,977 | Village in Illinois, USA |
| Mascoutah | 8,076 | City in Saint Clair County, Illinois, United States |
| Centreville | 4,844 | City in Illinois, United States |
| Lebanon | 4,225 | City in St. |
| Freeburg | 4,223 | City in Illinois, United States of America |
| Rosemont | 4,147 | Village in the U. |
| Caseyville | 4,115 | City in Illinois, United States of America |
| Dupo | 3,845 | City in Illinois, United States of America |
Distance to Other Cities
O'Fallon distances to largest Illinois cities