State Register Included in Rhode Island's State Register of Historic Places: Lyman Mill (1884-87) in North Providence Rhode Island's State Register includes nearly 20,000 historic and prehistoric resources. It includes properties listed in the National Register of Historic Places as well as additional sites determined to be significant to Rhode Island's heritage. These properties may be part of a historic district or individually listed. Did you know that the RI Historical Preservation & Heritage Commission has a State Register plaque program? Read on! RI State Register Listings (updated 1/8/2021) 210108state-register PDF file, about 5mbmegabytes Please note that there may be errors or omissions in this list. If you have a question about the State Register status of a property, even if it does not appear in this list, please contact us.