The Mahanoy and Mahantongo Historical & Preservation Society was incorporated as a non-profit organization in September, 1996. The Society "shall seek to research, collect and preserve the historical heritage of the Mahanoy and Mahantongo Valley areas of lower Northumberland County, western Schuylkill and upper Dauphin Counties." The first meeting was held at the Dalmatia home of William Harvey Wiest on September 30, 1996.