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	485 (Petroleum) – 155,634 (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 56 counties in the U.S. state of Montana. 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. Eight counties of the state are composed of two or more words.

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

The Federal Information Processing Standard (FIPS) code, which is used by the United States government to uniquely identify counties, is provided for each county. The FIPS code for each county links to census data for that county.