Region
Wyoming
89
Campbell County
24
Sheridan County
17
Campbell County (Wyo.)
15
Johnson County
14
Johnson County (Wyo.)
10
Sweetwater County
9
Montana
8
Powder River County
7
Powder River County (Mont.)
7
Sheridan County (Wyo.)
7
Carbon County
3
Fremont County
3
Fort Union Formation
2
Idaho
2
Lincoln County
2
Powder River Basin (Wyo. and Mont.)
2
Red Desert Region
2
Big Horn County
1
Big Horn County (Mont.)
1
Bighorn Mountains (Wyo. and Mont.)
1
Converse County
1
Converse County (Wyo.)
1
Gillette
1
Gillette Coal Field
1
Hanna Basin
1
North Dakota
1
Point of Rocks quadrangle
1
Powder River Watershed (Wyo. and Mont.)
1
Red Desert
1
Saddle Horse Butte Quadrangle
1
Sweetwater County (Wyo.)
1
Truman Draw Quadrangle
1