List of counties in Montana

Counties of Montana
LN FH LK SA MN MS RV GR PW DL BV SB MD JE GA BW LC TE PN GL TO LB HL CH CS JB MG PK SW SG WL GV FE BL PH PE MU YL CA BH TR RB GF VY DN SH RO MC RL DW PA CU PR CT FA WX
Location	State of Montana
Number	56
Populations	554 (Petroleum) – 170,843 (Yellowstone)
Areas	718 square miles (1,860 km2) (Silver Bow) – 5,543 square miles (14,360 km2) (Beaverhead)
Government	County government
Subdivisions	cities, towns, townships, unincorporated communities, Indian reservations, census designated place

This is a list of the counties in the U.S. state of Montana. There are 56 counties in the state.

Montana has two consolidated city-counties—Anaconda with Deer Lodge County and Butte with Silver Bow County. The portion of Yellowstone National Park that lies within Montana was not part of any county until 1978, when part of it was nominally added to Gallatin County, and the rest of it to Park County.

Montana's postal abbreviation is MT and its FIPS state code is 30.