Mercer County Pennsylvania (Vacant / Not In Use) has 2 places on the National Register of Historic Places including 1 place of Statewide significance. Significant places include Buhl, Frank H., Mansion, Waugh, Alexander P. and James S., House.
Some of the country's most noteable architects helped create the Mercer County places including Charles Owsley. Prominent architectural styles found in Mercer Country are Federal.