List of law enforcement agencies in Montana

State agencies

• Montana Department of Corrections
• Montana Department of Fish, Wildlife, and Parks
• Montana Department of Justice – Division of Criminal Investigations
• Montana Department of Justice – Fire Prevention and Investigation
• Montana Department of Justice – Gambling Investigation Bureau
• Montana Department of Livestock
• Montana Department of Transportation, Motor Carrier Services
• Montana Highway Patrol

  County agencies

• Beaverhead County Sheriff's Office
• Big Horn County Sheriff's Office
• Blaine County Sheriff's Office
• Broadwater County Sheriff's Office
• Carbon County Sheriff's Office
• Carter County Sheriff's Office
• Cascade County Sheriff's Office
• Chouteau County Sheriff's Office
• Custer County Sheriff's Office
• Daniels County Sheriff's Office
• Dawson County Sheriff's Office
• Fallon County Sheriff's Office
• Fergus County Sheriff's Office
• Flathead County Sheriff's Office
• Gallatin County Sheriff's Office
• Garfield County Sheriff's Office
• Glacier County Sheriff's Office
• Golden Valley County Sheriff's Office
• Granite County Sheriff's Office
• Hill County Sheriff's Office
• Jefferson County Sheriff's Office
• Judith Basin County Sheriff's Office
• Lake County Sheriff's Office
• Lewis and Clark County Sheriff's Office
• Liberty County Sheriff's Office
• Lincoln County Sheriff's Office
• Madison County Sheriff's Office
• McCone County Sheriff's Office
• Meagher County Sheriff's Office
• Mineral County Sheriff's Office
• Missoula County Sheriff's Office
• Musselshell County Sheriff's Office
• Park County Sheriff's Office
• Petroleum County Sheriff's Office
• Phillips County Sheriff's Office
• Pondera County Sheriff's Office
• Powder River County Sheriff's Office
• Powell County Sheriff's Office
• Prairie County Sheriff's Office
• Ravalli County Sheriff's Office
• Richland County Sheriff's Office
• Roosevelt County Sheriff's Office
• Rosebud County Sheriff's Office
• Sanders County Sheriff's Office
• Sheridan County Sheriff's Office
• Stillwater County Sheriff's Office
• Sweet Grass County Sheriff's Office
• Teton County Sheriff's Office
• Toole County Sheriff's Office
• Treasure County Sheriff's Office
• Valley Treasure County Sheriff's Office
• Wheatland County Sheriff's Office
• Wibaux County Sheriff's Office
• Yellowstone County Sheriff's Office

  Combined city and county agencies

• Anaconda-Deer Lodge Law Enforcement Agency
• Butte-Silverbow Police Department

  City agencies

• Anaconda-Deerlodge Police Department
• Baker Police Department
• Belgrade Police Department
• Billings Police Department
• Boulder Police Department
• Bozeman Police Department
• Bridger Police Department
• Brockton Police Department
• Chinook Police Department
• Colstrip Police Department
• Columbia Falls Police Department
• Columbus Police Department
• Conrad Police Department
• Cut Bank Police Department
• Darby Police Department
• Dillon Police Department
• East Helena Police Department
• Ennis Police Department
• Eureka Police Department
• Fairview Police Department
• Fort Benton Police Department
• Fromberg Police Department
• Glasgow Police Department
• Glendive Police Department
• Great Falls Police Department
• Hamilton Police Department
• Havre Police Department
• Helena Police Department
• Hot Springs Police Department
• Joliet Police Department
• Kalispell Police Department
• Laurel Police Department
• Lewistown Police Department
• Libby Police Department
• Livingston Police Department
• Manhattan Police Department
• Miles City Police Department
• Missoula Police Department
• Pinesdale Police Department
• Plains Police Department
• Polson Police Department
• Poplar Police Department
• Red Lodge Police Department
• Ronan Police Department
• St. Ignatius Police Department
• Sidney Police Department
• Stevensville Police Department
• Thompson Falls Police Department
• Three Forks Police Department
• Troy Police Department
• West Yellowstone Police Department
• Whitefish Police Department
• Wolf Point Police Department

  Tribal agencies

• Blackfeet Law Enforcement Services
• Bureau of Indian Affairs Office of Justice Services, Crow Agency
• Flathead Tribal Police Department
• Fort Belknap Tribal Police Department
• Fort Peck Tribes Department of Law and Justice Police
• Northern Cheyenne Agency
• Rocky Boy Tribal Law Enforcement Agency

  College and university agencies

• Montana State University Police Department
• University of Montana Police Department

  Airport agencies

• Bert Mooney Airport Police
• Gallatin Airport Authority Department of Public Safety
• Great Falls International Airport Authority Police
• Logan International Airport Police
• Missoula County Airport Police