Will one of the major cities is the capital, Helena.
But I know that there is a lot more, but i can't remember them all.
The major cities in Montana are Billings (the largest) Helena (the capitol) Great Falls, Bozeman, Missoula, and Butte. Other well populated areas in Montana are the Kalispell/Whitefish area just outside Glacier National Park, Lewistown, Glasgow, and Flathead Lake.