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- TennesseeShelby County4
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- CaliforniaSan Bernardino County2
- ColoradoMesa Verde National Park2
- Mesa Verde National Park (Colo.)2
- Montana2
- NevadaClark County2
- Uinta Basin (Utah and Colo.)2
- Utah2
- AlaskaDillingham Census Area1
- AlaskaGates of the Arctic National Park and Preserve1
- AlaskaKenai Peninsula Borough1
- AlaskaKodiak Island1
- AlaskaMatanuska-Susitna Borough1
- Appalachian Basin1
- ArizonaMohave County1
- ArkansasCrittenden County1
- Bear River Valley (Utah-Idaho)1
- CaliforniaManix Lake1
- Colorado1