The Zelienople Historical Society was incorporated in 1975 to preserve and share the history of Zelienople, PA. In 1978, the Society purchased and restored Passavant House, creating a museum featuring artifacts and memorabilia of the Passavant family and of the town's historic past. The Society has grown over the years to include nearly 500 members from across the country and in other parts of the world.

Zelienople Historical Society is dedicated to the preservation of local historical resources as well as the education of members and the public. A research library is maintained at Passavant House, with a large collection of primary resource materials as well as genealogical records of many early immigrant families. These materials are available to researchers seeking their own family records and those involved in scholarly pursuits.

Among educational programs are special tours for local school children conducted each spring.