Regional designations of Montana

The Regional designations of Montana vary widely within the U.S state of Montana. The state is a large geographical area (147,046 square miles (380,850 km²)) that is split by the Continental Divide, resulting in watersheds draining into the Pacific Ocean, Gulf of Mexico and Hudson's Bay. The state is approximately 545 miles (877 km) east to west along the Canada–United States border and 320 miles (510 km) north to south. The fourth largest state in land area, it has been divided up in official and unofficial ways into a variety of regions. Additionally, Montana is part of a number of larger federal government administrative regions.

Various parts of Montana have been given a number of formal and informal names, including:

The Montana Official Travel Site (visitmt.com) has designated six distinct regions in the state for travel promotion.

The Montana Department of Fish, Wildlife and Parks has designated seven administrative regions for the purposes of fish, wildlife and parks management.

The U.S. Fish and Wildlife Service includes Montana in the Mountain-Prairie region which includes Colorado, Kansas, Nebraska, North Dakota, South Dakota, Utah, and Wyoming.

Montana east of the continental divide, along with Wyoming makes up the Rocky Mountain Region of the Bureau of Indian Affairs (BIA) which includes the following Indian agencies in Montana.

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