Cities and Counties
Montana has 56 counties and 126 incorporated cities and towns. The most populated county is Yellowstone County, which is situated in the south central area. Montana's largest city, Billings, is located in this county. Billings has a population of 89,847 (2000). The least populated county is Petroleum County in central Montana. The smallest incorporated city is Ismay, with a population of 26 (2000). Ismay is located in Custer County in the southeastern portion of the state.