Region
Kentucky
23
Idaho
21
Minnesota
18
Teton Dam (Idaho)
17
Kansas
13
Black Hills (S.D. and Wyo.)
12
Missouri
11
Colorado
10
San Juan Basin (N.M. and Colo.)
10
Snake River (Wyo.-Wash.)
10
Massachusetts
9
Ozark Mountains Region
9
Wyoming
9
Illinois
8
Arizona
7
California
6
Montana
6
Texas
6
Great Basin
5
South Dakota
5
United States
5
Great Plains
4
Middle West
4
Nevada
4
Snake River Plain (Idaho and Or.)
4
Southwest, New
4
Teton River
4
West (U.S.)
4
Colorado River Watershed (Colo.-Mexico)
3
Cook County
3
Iowa
3
Lake County
3
Maine
3
Michigan
3
New Mexico
3
Oklahoma
3
Puerto Rico
3
Utah
3
Wisconsin
3
Adams County
2
Alaska
2
Denver Basin
2
Denver Region
2
Hawaii
2
High Plains Aquifer
2
Indiana
2
Madison Aquifer
2
Mississippi
2
Mississippi River
2
Mississippian Plateau
2
more ...