National Register of Historic Places listings in St. Clair County, Illinois

This is a list of the National Register of Historic Places listings in St. Clair County, Illinois.

This is intended to be a complete list of the properties and districts on the National Register of Historic Places in St. Clair County, Illinois, United States. Latitude and longitude coordinates are provided for many National Register properties and districts; these locations may be seen together in a map.

There are 30 properties and districts listed on the National Register in the county, including 4 National Historic Landmarks. Another property was once listed but has been removed.

Current listings

 * }

Former listing

 * }