Region
Pennsylvania
United States
1,343
Philadelphia
91
Monongahela River (W. Va. and Pa.)
47
Allegheny River (Pa. and N.Y.)
40
Philadelphia (Pa.)
40
New York (State)
39
Susquehanna River
37
Pittsburgh (Pa.)
30
Maryland
28
New Jersey
25
Delaware
24
Virginia
19
Illinois
17
Massachusetts
17
California
16
North Carolina
15
Texas
15
Washington (D.C.)
15
Erie (Pa.)
14
Florida
14
Ohio
14
Connecticut
13
France
13
Mississippi River
12
Mississippi River Region
12
Georgia
11
Michigan
11
New York
11
Washington (State)
11
Allegheny County (Pa.)
10
Great Lakes (North America)
10
New York (N.Y.)
10
Railroad
10
Wilkes-Barre (Pa.)
10
Altoona (Pa.)
9
Arkansas
9
Chesapeake and Delaware Canal (Del. and Md.)
9
Louisiana
9
Maine
9
Ohio River
9
Ohio River Region
9
Wisconsin
9
Allentown (Pa.)
8
Kentucky
8
Oregon
8
Alaska
7
Cumberland Road
7
Harrisburg (Pa.)
7
Idaho
7
more ...