O'Fallon Illinois Historical Society

This is the official page of the O'Fallon (Illinois) Historical Society. Founded in 1988, the Society has operated a museum at 101 W. State St. in Downtown O'Fallon, Illinois since 1996. The museum is in the old First National Bank building which was also the former public library. Built in 1904 and remodeled in 1922 when its iconic outdoor clock was added, the building is a St. Clair County Historic Site. The museum boasts 3 floors of exhibits and features the original bank vault in the basement. Hours are Wednesday, Friday and Saturday from 1 to 4 pm and by appointment. Tour groups are welcome. Admission is free.

The O'Fallon Historical Society was incorporated in 1989 as an Illinois not for profit organization and has been 501(c)3 tax exempt since 1992.