z pasmami: Sapphire Mountains, Garnet Range, John Long Mountains, Flint Creek Range, Bolder Batholith, Elkhorn Mountains, Anaconda Range, Pioneer Mountains, Highland Mountains, Central Montana Ranges m.in. z pasmami: Big Belt Mountains, Bridger Range, Highwood Mountains, Little Belt Mountains, Castle Mountains, Crazy Mountains, Judith-Moccasin Ranges, Big Snowy Mountains, Bull Mountains, Southwest Montana Ranges m.in. z pasmami: Tobacco Root Mountains, Ruby Range, Blacktail Mountains, Snowcrest Range, Gravelly Range.
Idaho-Bitterroot Rocky Mountains – grupa pasm górskich która dzieli się na następujące podgrupy: Clearwater Mountains m.in. z pasmami: North Clearwater Mountains, Selway Crags, South Clearwater Mountains, Bitterroot Range m.in. z pasmami: Cour d'Alene Mountains, Saint Joe Mountains, Northern Bitterroot Range, Central Bitteroot Range, Beaverhead Mountains, Centennial Mountains, Salmon River Mountains m.in. z pasmami: West Salmon River Mountains, Central Salmon River Mountains, East Salmon River Mountains, Sawtooth-Ketchum-Boise Area m.in. z pasmami: Boise Mountains, Sawtooth Range, White Cloud Mountains, Soldier Mountains, Smoky Mountains, Boulder Mountains, Pioneer Mountains, White Knob Mountains, Craters of the Moon-Snake River Plain, Lost River-Lemhi Ranges m.in.