Western Rocky Mountains – grupa pasm górskich która dzieli się na następujące podgrupy: Southeast Idaho Ranges m.in. z pasmami: Sublett Range, Deep Creek Mountains, Bannock Range, Portneuf Range, Blackfoot Mountains, Caribou Range, Peale Mountains, Wyoming Overthrust Belt Ranges m.in. z pasmami: Salt River Range, Southern Wyoming Overthrust Belt, Wyoming Range, Wasatch Range m.in. z pasmami: Bear River Mountains, Northern Wasatch Range, Central Wasatch Range, Southern Wasatch Range, San Pitch Mountains, Uinta Range m.in. z pasmami: Western Uinta Range, Central Uinta Range, Eastern Uinta Range, Dinosaur Area.
Southern Rocky Mountains – grupa pasm górskich która dzieli się na następujące podgrupy: Park Range m.in. z pasmami: Sierra Madre, Elkhead Mountains, Central Park Range, North Williams Fork Mountains, Southern Wyoming Ranges m.in. z pasmami: Medicine Bow Mountains i Laramie Mountains, Flat Tops Area m.in. z pasmami: Northwest Meeker Plateau, Flat Tops i White River Plateau, Front Range m.in. z pasmami: Northern Front Range, Rocky Mountain National Park Area, Central Front Range, South Park Hills, Rampart Range, Elk Range Area m.in. z pasmami: Grand Mesa, Elk Mountains i West Elk Mountains, Sawatch Range m.in.