Where is O'Fallon, Illinois

O'Fallon is a city in southwestern Illinois, located in St. Clair County about 15 miles east of downtown St. Louis. It is part of the St. Louis metropolitan area and is known for its growing residential neighborhoods, historic downtown, parks, and nearby Scott Air Force Base. The city offers convenient access to major highways, regional employment centers, and attractions throughout the Metro East.

Location Map of O'Fallon, St. Clair County, Illinois

About Map: The map shows the location of O'Fallon in St. Clair County, in the U.S. state of Illinois.

O'Fallon Map, Illinois

Where is O'Fallon Located?

O'Fallon is a city located in St. Clair County, Illinois, the United States. It lies in southwestern Illinois, about 15 miles east of downtown St. Louis and roughly 5 miles southeast of Scott Air Force Base. Fairview Heights is about 5 miles west, while Shiloh is around 5 miles south. O'Fallon is positioned near 38.592° North latitude and 89.912° West longitude. The 2020 Census recorded 32,289 residents. The city covers about 15.24 square miles, or 39.47 square kilometers, including land and water. O'Fallon developed as a railroad community in the 19th century and was named for John O'Fallon, a prominent railroad investor and civic leader. The city was incorporated in 1874 and grew as transportation connections linked it with St. Louis and other communities across the region. Nearby attractions include Rock Springs Park, O'Fallon Family Sports Park, and the St. Clair County Historical Society. A unique feature of O'Fallon is its close connection to Scott Air Force Base, one of the largest military installations in the St. Louis region. The city's location near Interstate 64 also provides convenient access to downtown St. Louis and the wider Metro East.

Most Viewed US Maps

O'Fallon City Facts

Distance from O'Fallon, IL to Nearby Cities

• Shiloh, IL – 5 miles (8 km)
• Fairview Heights, IL – 5 miles (8 km)
• Belleville, IL – 7 miles (11 km)
• Scott Air Force Base, IL – 5 miles (8 km)
• Swansea, IL – 7 miles (11 km)
• Lebanon, IL – 12 miles (19 km)
• Collinsville, IL – 15 miles (24 km)
• Edwardsville, IL – 20 miles (32 km)
• Cahokia Heights, IL – 15 miles (24 km)
• St. Louis, MO – 15 miles (24 km)
• Alton, IL – 30 miles (48 km)
• Waterloo, IL – 25 miles (40 km)
• Highland, IL – 30 miles (48 km)
• St. Charles, MO – 35 miles (56 km)
• Chesterfield, MO – 35 miles (56 km)
• Columbia, IL – 25 miles (40 km)
• Springfield, IL – 90 miles (145 km)
• Indianapolis, IN – 200 miles (322 km)

Top Attractions in O'Fallon, IL

• Rock Springs Park – A community park with walking trails, playgrounds, sports facilities, picnic areas, and open green spaces.
• O'Fallon Family Sports Park – A large recreational complex with baseball and softball fields, soccer facilities, walking paths, and other sports amenities.
• O'Fallon Community Park – A local park offering recreation facilities, playgrounds, open areas, and community events.
• Scott Air Force Base – A major U.S. Air Force installation located near O'Fallon and an important part of the region's military history and economy.
• O'Fallon Historical Society Museum – A local historical attraction preserving artifacts, photographs, and stories from the city's past.
• St. Clair County Historical Society – A regional organization preserving the history of St. Clair County and its communities.
• Cahokia Mounds State Historic Site – A major archaeological site near Collinsville preserving the remains of a large pre-Columbian Native American city.
• Gateway Arch National Park – The iconic St. Louis landmark and national park located across the Mississippi River from the Illinois Metro East.

Airports Near O'Fallon, IL

• MidAmerica St. Louis Airport (BLV) – 10 miles
• St. Louis Downtown Airport (CPS) – 15 miles
• Spirit of St. Louis Airport (SUS) – 35 miles
• St. Louis Lambert International Airport (STL) – 30 miles
• Veterans Airport of Southern Illinois (MWA) – 75 miles

Sources:

Population and area data sourced from the United States Census Bureau (2020 Census). General city information referenced from the official O'Fallon city website and local government records.

Illinois Related Maps and Info