Region
Alaska
493
Colorado
443
California
369
Utah
306
Nevada
299
United States
280
Montana
277
Wyoming
239
Arizona
235
Idaho
206
Kansas
205
New Mexico
171
Oregon
133
Washington (State)
118
North America
89
Pennsylvania
84
Virginia
74
South Dakota
66
Texas
64
New York (State)
62
Kentucky
61
Maine
51
Michigan
51
West (U.S.)
50
North Dakota
48
Wisconsin
41
North Carolina
40
Massachusetts
39
Colorado Plateau
36
Georgia
36
Arkansas
35
Mexico
35
Alabama
34
South Carolina
34
Florida
33
Illinois
33
Oklahoma
33
New Jersey
31
Ohio
31
Custer County
30
Vermont
30
Tennessee
28
West Virginia
28
Connecticut
27
San Juan County
27
Missouri
26
Brazil
25
Hawaii
24
Powder River Basin (Wyo. and Mont.)
24
Uinta Basin (Utah and Colo.)
24
more ...