Region
Colorado
381
Garfield County
19
Gunnison County
13
Moffat County
8
Rio Blanco County
8
Routt County
8
Douglas County
7
El Paso County
7
Fremont County
7
Park County
7
Boulder County
6
Chaffee County
6
Eagle County
6
Denver Basin
5
Jefferson County
5
La Plata County
5
Pitkin County
5
Elbert County
4
Mesa County
4
San Luis Valley (Colo. and N.M.)
4
Adams County
3
Arapahoe County
3
Clear Creek County
3
Delta County
3
Front Range (Colo. and Wyo.)
3
Fruitland Formation (Colo. and N.M.)
3
Glenwood Springs Region
3
Idaho Springs
3
Las Animas County
3
Pueblo County
3
Rio Grande County
3
Rocky Mountains Region
3
Teller County
3
Weld County
3
Archuleta County
2
Baca County
2
Cheyenne Basin (Colo. and Wyo.)
2
Cheyenne County
2
Colorado Springs
2
Conejos County
2
Denver
2
Dolores County
2
Haiti
2
Hinsdale County
2
Lake County
2
Laramie Mountains (Wyo. and Colo.)
2
Mineral County
2
Ouray County
2
Piceance Creek Basin
2
Raton Basin (Colo. and N.M.)
2
more ...