A variety of online resources provide access to information about historic properties that have been recorded and recognized through SHPO programs.
SC ArchSite (GIS)
SC Historic Properties Record (SCHPR) (searchable database of all National Register listed property records; survey records in progress)
National Register Records (static website; properties listed through February 5, 2013 only)
Historic Contexts/Survey Reports
Research Resources / "Useful Sources for Researching Historic Properties"