Region
Pennsylvania
28
Altoona (Pa.)
2
Bucks County (Pa.)
2
Chester County (Pa.)
2
Elmira (N.Y.)
2
Greenwood Furnace State Park (Pa.)
2
Huntingdon County (Pa.)
2
Kent County (Del.)
2
Lancaster County (Pa.)
2
Maryland
2
Milroy (Pa.)
2
New Castle County (Del.)
2
New Cumberland (Pa.)
2
Philadelphia (Pa.)
2
West Branch and Allegheny Canal
2
Berks County (Pa.)
1
Cumberland County (Pa.)
1
Delaware
1
Delaware River (N.Y.-Del. and N.J.)
1
Lancaster, Lebanon and Pine Grove railroad
1
Mason-Dixon Line
1
New Jersey
1
Northampton County (Pa.)
1
Philadelphia
1
Sussex County (Del.)
1
United States
1
West Virginia
1
York (Pa.)
1
York County (Pa.)
1