The Indiana Register of Historic Sites and Structures was created in 1981 by the Indiana General Assembly. The Survey and Registration Section of the Indiana Division of Historic Preservation and Archaeology oversees this state register. All places within Indiana that are listed on the National Register of Historic Places are automatically on Indiana's Register. Additional sites are on the state register, as the state's register does not require as many documents and sources for inclusion.
State register
For a list of historic sites that are on both the national register and the state register see: National Register of Historic Places listings in IndianaIndiana register only
The following is a list of historic sites on the Indiana register, but not the national register:
References
Indiana Register of Historic Sites and Structures Wikipedia(Text) CC BY-SA