Region
United States
19,317
Colorado
1,432
California
1,360
Alaska
1,090
Arizona
791
Utah
786
Nevada
774
New Mexico
714
Wyoming
699
Montana
696
Washington (State)
644
Oregon
629
Idaho
565
Florida
466
Texas
435
Pennsylvania
432
New York (State)
400
Michigan
363
Virginia
311
West (U.S.)
305
South Dakota
296
Wisconsin
284
Kansas
275
Ohio
266
Illinois
262
Missouri
258
Tennessee
258
Massachusetts
252
Minnesota
252
Maryland
248
North America
246
Washington (D.C.)
244
New Jersey
242
Arkansas
231
North Carolina
225
Kentucky
222
West Virginia
203
Alabama
191
North Dakota
187
Georgia
177
Hawaii
174
Oklahoma
170
Indiana
164
Nebraska
156
South Carolina
150
China
137
Southern States
126
Iowa
122
Mexico
116
Colorado River Watershed (Colo.-Mexico)
114
more ...