Region
Colorado
8
Oklahoma
7
Alaska
3
Arizona
3
Utah
3
Alabama
2
Arkansas
2
California
2
Florida
2
Front Range Urban Corridor
2
Massachusetts
2
Minnesota
2
Missouri
2
Montana
2
Nebraska
2
New Hampshire
2
North Dakota
2
Ohio
2
South Carolina
2
Texas
2
Vermont
2
Wisconsin
2
Wyoming
2
American Samoa
1
Apalachicola River Watershed
1
Apalachicola River Watershed (Fla.)
1
Ardmore Quadrangle
1
Baca County
1
Clinton Quadrangle
1
Connecticut
1
Culpeper Basin (Va. and Md.)
1
Davis County
1
Delaware
1
Douglas County
1
El Paso County
1
Elbert County
1
Fort Smith Quadrangle
1
Georgia
1
Gila Bend Indian Reservation
1
Guam
1
Hawaii
1
Hibbing Region
1
Idaho
1
Illinois
1
Indiana
1
Iowa
1
Kansas
1
Kentucky
1
Lawton Quadrangle
1
Louisiana
1
more ...