Region
Ohio
1,107
United States
133
Wayne National Forest
64
Cuyahoga Valley National Park (Ohio)
63
Ohio River Valley
58
Ohio River
53
Wayne National Forest (Ohio)
53
Cleveland
51
Cuyahoga Valley National Park
41
Cincinnati
40
Kentucky
38
Indiana
34
Ohio River Watershed
31
West Virginia
31
Chesapeake and Ohio Canal National Historical Park
27
Dayton
27
Mississippi River Valley
27
Ohio and Erie Canal National Heritage Corridor (Ohio)
27
Dayton Aviation Heritage National Historical Park (Ohio)
23
Pennsylvania
21
Mississippi River
20
Columbus
19
Ohio and Erie Canal National Heritage Corridor
17
Chesapeake and Ohio Canal (Md. and Washington, D.C.)
13
Cleveland (Ohio)
12
Wright-Patterson Air Force Base (Ohio)
12
Illinois
10
Maryland
10
Michigan
10
Northwest, Old
10
Wright-Patterson Air Force Base
10
Erie, Lake
9
Franklin County
9
Hopewell Culture National Historical Park (Ohio)
9
Louisiana
9
Miami River Watershed
9
Virginia Kendall Reserve (Ohio)
9
Youngstown
9
Colorado
8
Geauga County
8
Belmont County
7
California
7
Cuyahoga River
7
Jefferson County
7
Scioto River
7
William Howard Taft National Historic Site (Cincinnati, Ohio)
7
Cincinnati Region
6
Dayton Region
6
Miami River Valley
6
Monongahela River (W. Va. and Pa.)
6
more ...