In order of population, they would be as follows:
Billings - 110,000
Missoula - 75,000
Great Falls - 58,000
Bozeman - 50,000
Butte - 34,000
Helena - 33,000
Kalispell - 25,000
Manitoulin Island is located within the borders of the Canadian province of Ontario.
It is the largest freshwater island in the world, inhabited by over 13 thousand people. Although it is a lake island, it has 108 freshwater lakes, some of which have their islands too.