Welcome to O'Fallon ...
The city of O'Fallon is located in Saint Clair County<1>.
The pronunciation of O'Fallon: oh-FAL-uhn<2>
While we don't have a date for the founding of O'Fallon, you might consider that their post office opened in 1888.
From the Census Estimates for 2019, O'Fallon has a population of 29,621 people<3> (see below for details).
O'Fallon is 540 feet [165 m] above sea level.<4>.
Time Zone: O'Fallon lies in the Central Time Zone (CST/CDT) and observes daylight saving time
O'Fallon is within the boundaries of the (618) area code.
The ZIP code for O'Fallon: 62269<5>
Websites for O'Fallon ...
Official Website: www.ofallon.org/
Population Details ...
Taken from the 2019 Census Estimates, O'Fallon had an population of 29,621 people. This is an increase of 4.74% since the 2010 Census (or an increase of 35.19% since the 2000 Census).
At the time of the 2010 Census, O'Fallon had a population of 28,281 people (which is 10.47% of the total population of Saint Clair County). This makes O'Fallon the county's 2nd most populous community.
The population of O'Fallon represents 0.22% of the population of Illinois (which has 12,830,632 people), making it the state's 73rd most populous community.
With a 2010 count of 28,281 people, the population of O'Fallon increased 29.08% from the 2000 Census (which had a count of 21,910 people).
More information can be found on the Census Page for O'Fallon.
Communities Also Named O'Fallon ...
For more information, see our Tidbits & Trivia Page for O'Fallon.
Communities near O'Fallon ...
We have created a list of 10 communities that are near O'Fallon.
- Saint Louis
(15 miles [24.1 km] to the west)- Jump to our Gazetteer entry for Saint Louis
- Saint Louis is located in Saint Louis City (MO)
- Population from the 2020 Census: 297,645 people
- Jump to TripAdvisor's Tourism page for Saint Louis <6>
- Belleville
(6 miles [9.7 km] to the southwest)- Jump to our Gazetteer entry for Belleville
- Belleville is located in Saint Clair County
- Population from the 2020 Census: 40,536 people
- Jump to TripAdvisor's Tourism page for Belleville <6>
- Granite City
(14 miles [22.5 km] to the northwest)- Jump to our Gazetteer entry for Granite City
- Granite City is located in Madison County
- Population from the 2020 Census: 27,959 people
- Jump to TripAdvisor's Tourism page for Granite City <6>
- East Saint Louis
(12 miles [19.3 km] to the west)- Jump to our Gazetteer entry for East Saint Louis
- East Saint Louis is located in Saint Clair County
- Population from the 2020 Census: 25,776 people
- Jump to TripAdvisor's Tourism page for East Saint Louis <6>
- Edwardsville
(15 miles [24.1 km] to the north)- Jump to our Gazetteer entry for Edwardsville
- Edwardsville is located in Madison County
- Population from the 2020 Census: 25,189 people
- Jump to TripAdvisor's Tourism page for Edwardsville <6>
- Collinsville
(6 miles [9.7 km] to the northwest)- Jump to our Gazetteer entry for Collinsville
- Collinsville is located in Madison County
- Population from the 2020 Census: 24,217 people
- Jump to TripAdvisor's Tourism page for Collinsville <6>
- Cahokia
(15 miles [24.1 km] to the west)- Jump to our Gazetteer entry for Cahokia
- Cahokia is located in Saint Clair County
- Population from the 2020 Census: 13,742 people
- Jump to TripAdvisor's Tourism page for Cahokia <6>
- Glen Carbon
(12 miles [19.3 km] to the north)- Note: The GPS coordinates that we are using for Glen Carbon have been provided by the GNIS.<7> The coordinates still need to be verified.
- Jump to our Gazetteer entry for Glen Carbon
- Glen Carbon is located in Madison County
- Population from the 2020 Census: 12,887 people
- Jump to TripAdvisor's Tourism page for Glen Carbon <6>
- Columbia
(18 miles [29 km] to the southwest)- Note: The GPS coordinates that we are using for Columbia have been provided by the GNIS.<7> The coordinates still need to be verified.
- Jump to our Gazetteer entry for Columbia
- Columbia is located in Monroe County
- Population from the 2020 Census: 10,627 people
- Jump to TripAdvisor's Tourism page for Columbia <6>
- Troy
(9 miles [14.5 km] to the north)- Jump to our Gazetteer entry for Troy
- Troy is located in Madison County
- Population from the 2020 Census: 10,399 people
- Jump to TripAdvisor's Tourism page for Troy <6>
To Help With Your Genealogy Research ...
We have a couple of sections for those tracing their genealogy.
We created a list of cemeteries that are in the area around O'Fallon. Our list includes the location of those cemeteries and we provide an overhead view. See our Cemetery List for O'Fallon.
Using the information from an 1895 Atlas, we've created a list of communities that were in the area of O'Fallon. Our list includes information such as whether the 1895 community had a post office or railroad service. See our List of 1890's Communities around O'Fallon.
We also have a detailed list of newspapers that have been published in the area around O'Fallon. Our list includes 10 papers. See our Newspapers Page for O'Fallon.
TripAdvisor Tourism Pages for O'Fallon ...
Looking for more information about O'Fallon? A wonderful source is the TripAdvisor website. We always start with the TripAdvisor Tourism page, where you can read an overview with links that will help you find lodging, restaurants and attractions.
In addition to the Tourism page for O'Fallon, there are neighboring communities that also have Tourism pages. More information about those communities can be found on our TripAdvisor Page for O'Fallon.
Adding O'Fallon to Our Gazetteer ...
We originally found mention of O'Fallon in both the FIPS-55 and the GNIS. For more information, see the FIPS and GNIS Codes sections on our Miscellaneous Page.
From our notes, the earliest published mention we've found for O'Fallon was in the document titled List of Post Offices from Cameron Blevins and Richard Helbock.<8>
From that list, the O'Fallon post office opened in 1888.
We also found O'Fallon on a map titled Shell Oil Road Map for Illinois (1956).
For more details, see References and Mentions for O'Fallon.
Off-the-Road Links ...
The official website for O'Fallon: www.ofallon.org/
The official website for Saint Clair County: www.co.st-clair.il.us/
The official website for State of Illinois: https://illinois.gov
Footnotes ...
| <1> | If you're interested in how the shape of Illinois' counties, including Saint Clair, have changed over time, we recommend the Atlas of Historical County Boundaries. |
| <2> | The pronunciation we've provided is our attempt to give a phonetic pronunciation for O'Fallon. While it might not be exactly right, hopefully it will be close. If we have it wrong or there's a better way to pronounce the name, please contact us through our Feedback Page. |
| <3> | Population counts have been provided by the U.S. Census Bureau. For more detail, please visit our Census Page for O'Fallon. |
| <4> | The elevation is an estimate for the area around O'Fallon - it will be higher in some places and lower in others. |
| <5> | ZIP Codes have been created by the United States Postal Service (USPS) as a way of grouping addresses to make delivery more efficient. The boundaries of the ZIP Code can be changed, re-assigned, eliminated or overlapped with other ZIP Codes. So keep in mind that any given ZIP Code is only 'loosely' associated with a city (such as O'Fallon). When looking for a ZIP Code, whether O'Fallon or elsewhere, it's always best to check the website of the United States Postal Service (USPS). |
| <6> | While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program. |
| <7> | The location has been supplied by the Geographic Names Information System - which is maintained by the U.S. Geological Survey (USGS). While these values should be definitive, we found that accuracy can vary and you should double-check the location if accuracy is required. |
| <8> | A copy of their list with background information can be found at: https://cblevins.github.io/us-post-offices/data-biography/ |