O'Fallon, IL

O'Fallon is a city in St. Clair CountyIllinoisUnited States. The 2010 census listed the population at 28,281. The city is the third largest city in the Metro-East region and Southern Illinois. It sits 5 miles (8.0 km) from Scott Air Force Base and 18 miles (29 km) from Downtown St Louis.

Like its namesake in St. Charles County, Missouri, O'Fallon is part of the St. Louis Metropolitan Statistical Area. This makes O'Fallon (along with the two Troys in Illinois and Missouri) one of the few pairs of like-named municipalities to be part of the same MSA.


Founded in 1854, O'Fallon's namesake comes from Colonel John O'Fallon who was a wealthy gentleman from St. Louis. In downtown O'Fallon, a Baltimore and Ohio Railroad railroad depot was built, which helped put O'Fallon on the map. City lots were platted and sold at a public auction on May 18, 1854. A post office was established the following year and the city began attracting German settlers looking for fertile farming land. On January 27, 1874, O'Fallon was incorporated as a village. On March 14, 1905, the citizens voted for a change to the city form of government. Since its founding, O'Fallon has gained population every year except 1930, when the census showed a net loss of six residents.

Tornado damage, 2006

The city center is approximately two miles east of the intersection of Interstate 64 and U.S. Route 50. Suburban growth in O'Fallon expanded considerably during the 1980s and following the expansion of Interstate 64 in the 1990s. Subdivisions include Thornbury Hill, Nolin Creek Estates, Fairwood Hills, Deer Creek, Forest Hills, and Fairwood East. O'Fallon Township High School's main campus at 600 South Smiley Street has undergone numerous additions over the past decades to ease overcrowding, including the creation of the separate 9th Grade Milburn Campus. A new city hall was completed in 1996.

Parks and public services

Rock Springs Nature Park
Public Library

O'Fallon Parks and Recreation

  • Family Sports Park
  • Hesse Park
  • Katy Cavin's Community Center
  • O'Fallon Community Park
  • O'Fallon Memorial Pool
  • Rock Springs Nature Park
    • Nature center
    • Jogging/cycling paths
    • Nature trails
    • Natural prairie
    • Dog Park
  • St. Clair Recreation Complex
  • St. Ellen Mine Park
  • Thoman Park
  • Veteran's Monument


  • O'Fallon Public Library

Registered historic places


Delores Moye School
  • O'Fallon Community Consolidated School District #90
    • Delores Moye Elementary School
    • Estelle Kampmeyer Elementary School
    • J. E. Hinchcliffe Sr. Elementary School
    • Laverna Evans Elementary School
    • Marie Schaefer Elementary School
    • Edward A. Fulton Junior High School
    • Amelia V. Carriel Junior High School
  • O'Fallon Central School District #104
  • O'Fallon Township High School District No. 203

Private schools

  • Discovery School
  • St. Clare Catholic School
  • First Baptist Academy
O'Fallon, Illinois
City of O’Fallon
Official seal of O'Fallon, Illinois
Official logo of O'Fallon, Illinois
Location of O'Fallon in St. Clair County, Illinois.
Location of O'Fallon in St. Clair County, Illinois.
Location of Illinois in the United States
Location of Illinois in the United States
Coordinates: 38.59611°N 89.91551°WCoordinates38.59611°N 89.91551°W
Country United States
State Illinois
County St. Clair
Township O'Fallon
 • Type Democracy
 • Mayor Herb Roach
 • Total 15.37 sq mi (39.82 km2)
 • Land 15.25 sq mi (39.50 km2)
 • Water 0.12 sq mi (0.32 km2)
 • Total 28,281
 • Estimate 
 • Density 1,903.67/sq mi (735.00/km2)
Time zone UTC−6 (CST)
 • Summer (DST) UTC−5 (CDT)
ZIP code(s)
Area code(s) 618
FIPS code 17-55249
Wikimedia Commons O'Fallon, Illinois
Website ofallon.org
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