Derry Church existed in Derry Township, Dauphin County before Hershey. When Milton Hershey built the town of Hershey, Derry Church became part of his community. The Derry Post Office ceased to exist, being replaced with the Hershey Post Office. If we can help you in any way, we are the Derry Township Historical Society, P.O Box 316, Hershey, PA 17033... Phone 717-520-0748 Lee