The Office of Management and Budget is considering changing the definition of metropolitan counties including Cascade (Great Falls) and Missoula (Missoula),

The Office of Management and Budget is considering changing the definition of metropolitan counties by reclassifying about 140 small metropolitan areas as nonmetropolitan. Here is a list of counties that met the reclassification criteria based on the 2010 Census. The new definition would use data from the 2020 Census.