The Northumberland County Historical Society is a Pennsylvania nonprofit organization, which was chartered on October 26, 1925 and incorporated on May 21, 1998. Its leaders, members and volunteers are dedicated to the collection, preservation and exhibition of artifacts, documents, photographs, and other items which tell the story of Northumberland County, Pennsylvania and its people. Headquartered at the Hunter House Museum at historic Fort Augusta in Pennsylvania's upper Susquehanna Valley, the Historical Society is also home to the Charlotte Darrah Walter Genealogical Library, and presents programs on topics of interest to historians, genealogists and members of the general public at various times during each calendar year. The facilities, which are open from March through December (but closed during the winter months), are physically located at 1150 North Front Street in Sunbury, Pennsylvania.