Region
Pennsylvania
23
Chester County
5
Maryland
3
Berks County
2
Lancaster County
2
Philadelphia
2
Adams County
1
Bucks County
1
Carroll County
1
Carroll Valley
1
Delaware
1
Ivyland
1
Lebanon County
1
Lehigh County
1
Marsh Creek (Tioga County)
1
New Castle County
1
Oley (Township)
1
Philadelphia Metropolitan Area
1
Pittsburgh
1
Susquehanna River Watershed
1
West Virginia
1