St. Clair is a city in Franklin County, Missouri, United States. Landmarks include St. Clair County, Weaubleau structure and Osceola Municipal Airport. St. Clair is the birthplace of Phoebe Hearst, philanthropist, feminist and suffragist.
- CountyFranklin County
- Population4,791 (2020 U.S. Census)
- Historic places3 on the National Register

































St. Clair County
Weaubleau structure
A view of St. Clair