Hi Judy & List, "The Pennsylvania Line" published by the Southwest Genealogical Services lists the small community of Hilldale (pop.250) in Forward Twp., Allegheny County. This may the area you are seeking for Hilldale Cemetery. This book is no longer in print but is a valuable resource. The Fourth Edition published in 1990 was created by William L. Iscrupe and Shirley G. M. Iscrupe of Laughlintown, Pa. The company may not be in service. Rosalie