The purpose of the society is to promote public knowledge and interest in the history of Sussex County, New Jersey, and surrounding areas by:
Compiling, publishing and disseminating information;
Collecting, preserving and studying historical, genealogical and archaeological records, documents, papers and artifacts;
Maintaining a public museum;
Promoting the preservation and protection of buildings, cemeteries and other sites of historic interest and co-operating with other organizations of similar interest.