Montana county jails
56 counties
| County | Jail / facility | Phone |
|---|---|---|
| Beaverhead County | Beaverhead County Jail | (406) 683-3700 |
| Big Horn County | Big Horn County Jail | (406) 665-9780 |
| Blaine County | Blaine County Jail | (406) 357-3260 |
| Broadwater County | Broadwater County Detention Center | (406) 266-3441 |
| Carbon County | Carbon County Detention Center | (406) 446-1234 |
| Carter County | Carter County Sheriff's Office (inmates held at contracted facilities) | (406) 775-8743 |
| Cascade County | Cascade County Adult Detention Center | (406) 454-6820 |
| Chouteau County | Chouteau County Jail | (406) 622-5451 |
| Custer County | Custer County Detention Center | (406) 874-3320 |
| Daniels County | Daniels County Sheriff's Office (inmates held at contracted facilities) | (406) 487-2691 |
| Dawson County | Dawson County Jail | (406) 377-5291 |
| Deer Lodge County | Anaconda-Deer Lodge County Detention Center | (406) 563-4040 |
| Fallon County | Fallon County Jail | (406) 778-2879 |
| Fergus County | Fergus County Jail | (406) 535-3415 |
| Flathead County | Flathead County Detention Center | (406) 758-5590 |
| Gallatin County | Gallatin County Detention Center | (406) 582-2100 |
| Garfield County | Garfield County Jail | (406) 557-2540 |
| Glacier County | Glacier County Detention Center | (406) 873-2711 |
| Golden Valley County | Golden Valley County Sheriff's Office (inmates housed at contracted county jails) | (406) 568-2321 |
| Granite County | Granite County Jail | (406) 859-3251 |
| Hill County | Hill County Detention Center | (406) 265-2512 |
| Jefferson County | Jefferson County Detention Center | (406) 225-4075 |
| Judith Basin County | Judith Basin County Sheriff's Office (inmates housed under contract at neighboring county jails) | (406) 566-2277 |
| Lake County | Lake County Detention Center | (406) 883-7301 |
| Lewis and Clark County | Lewis and Clark County Detention Center | (406) 447-8235 |
| Liberty County | Liberty County Sheriff's Office Detention | (406) 759-5171 |
| Lincoln County | Lincoln County Detention Center | (406) 293-4112 |
| Madison County | Madison County Detention Center | (406) 843-5301 |
| McCone County | McCone County Sheriff's Office Detention | (406) 485-3405 |
| Meagher County | Meagher County Sheriff's Office Detention | (406) 547-3397 |
| Mineral County | Mineral County Jail | (406) 822-3555 |
| Missoula County | Missoula County Detention Facility | (406) 258-4000 |
| Musselshell County | Musselshell County Jail | (406) 323-1402 |
| Park County | Park County Detention Center | (406) 222-4170 |
| Petroleum County | Fergus County Detention Center | (406) 535-3415 |
| Phillips County | Phillips County Detention Center | (406) 654-2350 |
| Pondera County | Pondera County Detention Center | (406) 271-4060 |
| Powder River County | Powder River County Jail | (406) 436-2333 |
| Powell County | Powell County Detention Center | (406) 846-2711 |
| Prairie County | Contracted county detention facility (arranged by the Prairie County Sheriff's Office) | — |
| Ravalli County | Ravalli County Detention Center | (406) 363-3033 |
| Richland County | Richland County Detention Center | (406) 433-2919 |
| Roosevelt County | Roosevelt County Jail | (406) 653-6240 |
| Rosebud County | Rosebud County Detention Center | (406) 346-2715 |
| Sanders County | Sanders County Detention Center | (406) 827-3584 |
| Sheridan County | Sheridan County Jail | (406) 765-2550 |
| Silver Bow County | Butte-Silver Bow Detention Center | (406) 497-1120 |
| Stillwater County | Stillwater County Detention Center | (406) 322-5326 |
| Sweet Grass County | Sweet Grass County Jail | (406) 932-5143 |
| Teton County | Teton County Jail | (406) 466-5781 |
| Toole County | Toole County Jail | (406) 424-8310 |
| Treasure County | Treasure County Sheriff's Office (inmates housed at contracted county jails) | (406) 342-5211 |
| Valley County | Valley County Detention Center | (406) 228-4333 |
| Wheatland County | Wheatland County Sheriff's Office (inmates housed at contracted county jails) | (406) 632-4893 |
| Wibaux County | Wibaux County Sheriff's Office (inmates housed at contracted county jails) | (406) 796-2221 |
| Yellowstone County | Yellowstone County Detention Facility | (406) 256-2200 |