| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| MJB Trailer Court | city | Montana | United States | 46.76 | -114.08 | 3349 | |
| MacKenzie (historical) | city | Montana | United States | 46.16 | -104.71 | 2877 | |
| Macon | city | Montana | United States | 48.11 | -105.52 | 1978 | |
| Maddux | city | Montana | United States | 48.14 | -109.42 | 4468 | |
| Madoc | city | Montana | United States | 48.81 | -105.29 | 2736 | |
| Maiden | city | Montana | United States | 47.18 | -109.23 | 5249 | |
| Maiden Rock | city | Montana | United States | 45.70 | -112.74 | 5869 | |
| Malone | city | Montana | United States | 47.94 | -112.17 | 4189 | |
| Malta | city | Montana | United States | 48.36 | -107.87 | 2509 | |
| Mammoth | city | Montana | United States | 45.67 | -112.02 | 6833 | |
| Manchester | city | Montana | United States | 47.54 | -111.46 | 3398 | |
| Manger | city | Montana | United States | 46.52 | -111.23 | 6709 | |
| Manhattan | city | Montana | United States | 45.86 | -111.33 | 4251 | |
| Manicke (historical) | city | Montana | United States | 48.04 | -115.30 | 3441 | |
| Mann | city | Montana | United States | 45.97 | -108.11 | 3349 | |
| Mann (historical) | city | Montana | United States | 47.26 | -110.73 | 4199 | |
| Mannix | city | Montana | United States | 46.77 | -112.77 | 5029 | |
| Manson | city | Montana | United States | 48.24 | -112.01 | 3510 | |
| Mar-Le Villa | city | Montana | United States | 48.18 | -114.29 | 3349 | |
| Marion | city | Montana | United States | 48.11 | -114.66 | 4189 | |
| Marsh | city | Montana | United States | 46.89 | -104.93 | 2509 | |
| Martin (historical) | city | Montana | United States | 46.91 | -107.75 | 3349 | |
| Martin City | city | Montana | United States | 48.39 | -114.04 | 3349 | |
| Martinsdale | city | Montana | United States | 46.46 | -110.31 | 5029 | |
| Martinsdale Colony | city | Montana | United States | 46.49 | -110.27 | 5029 | |
| Marysville | city | Montana | United States | 46.75 | -112.30 | 5869 | |
| Matthews | city | Montana | United States | 45.63 | -111.08 | 5147 | |
| Maudlow | city | Montana | United States | 46.11 | -111.17 | 4593 | |
| Maus Trailer Court | city | Montana | United States | 46.99 | -104.19 | 2641 | |
| Maxemâhoévéhoeno | city | Montana | United States | 46.41 | -105.84 | 2509 | |
| Maxville | city | Montana | United States | 46.46 | -113.23 | 5029 | |
| McAllister | city | Montana | United States | 45.44 | -111.73 | 5029 | |
| McCabe | city | Montana | United States | 48.24 | -104.38 | 2509 | |
| McCarthyville (historical) | city | Montana | United States | 48.27 | -113.44 | 4599 | |
| McClain | city | Montana | United States | 46.71 | -114.08 | 3349 | |
| McClave | city | Montana | United States | 46.81 | -109.77 | 4327 | |
| McCloud | city | Montana | United States | 46.90 | -105.60 | 2700 | |
| McCone City (historical) | city | Montana | United States | 48.04 | -106.41 | 2096 | |
| McDermott (historical) | city | Montana | United States | 48.91 | -111.52 | 4396 | |
| McDonald | city | Montana | United States | 47.32 | -114.46 | 2598 | |
| McDonald | city | Montana | United States | 46.65 | -112.59 | 5400 | |
| McElroy | city | Montana | United States | 48.88 | -104.12 | 2509 | |
| McGillvary | city | Montana | United States | 46.66 | -112.59 | 5108 | |
| McHugh Trailer Court | city | Montana | United States | 46.62 | -112.03 | 4189 | |
| McLeod | city | Montana | United States | 45.66 | -110.12 | 5029 | |
| McMullan | city | Montana | United States | 46.34 | -111.71 | 6804 | |
| McNamara | city | Montana | United States | 46.91 | -113.68 | 4189 | |
| McQueen | city | Montana | United States | 46.02 | -112.50 | 5869 | |
| McRae (historical) | city | Montana | United States | 45.88 | -107.12 | 3349 | |
| McTwiggan (historical) | city | Montana | United States | 47.01 | -107.71 | 3349 | |
| Meaderville | city | Montana | United States | 46.02 | -112.51 | 5869 | |
| Meadow Manor Incorporated | city | Montana | United States | 48.20 | -114.30 | 3349 | |
| Meadowlark Mobile Home Park | city | Montana | United States | 48.17 | -114.31 | 3349 | |
| Mecaha (historical) | city | Montana | United States | 47.32 | -107.93 | 2509 | |
| Medicine Hot Springs | city | Montana | United States | 45.85 | -114.04 | 5045 | |
| Medicine Lake | city | Montana | United States | 48.50 | -104.50 | 1942 | |
| Melrose | city | Montana | United States | 45.63 | -112.68 | 5200 | |
| Melstone | city | Montana | United States | 46.60 | -107.87 | 2887 | |
| Meltons | city | Montana | United States | 47.94 | -114.39 | 3727 | |
| Melville | city | Montana | United States | 46.10 | -109.95 | 5029 | |
| Menard | city | Montana | United States | 45.97 | -111.17 | 5029 | |
| Menard Wye | city | Montana | United States | 45.97 | -111.18 | 5029 | |
| Merino | city | Montana | United States | 47.24 | -110.37 | 4199 | |
| Meriwether | city | Montana | United States | 48.61 | -112.76 | 4189 | |
| Merriman | city | Montana | United States | 45.34 | -110.77 | 5029 | |
| Metersville (historical) | city | Montana | United States | 47.49 | -107.60 | 2854 | |
| Meyers Creek | city | Montana | United States | 45.49 | -109.93 | 6200 | |
| Meyersburg (historical) | city | Montana | United States | 46.01 | -110.66 | 5101 | |
| Michigan Settlement (historical) | city | Montana | United States | 47.14 | -110.84 | 5223 | |
| Mid Canon | city | Montana | United States | 47.13 | -111.89 | 3599 | |
| Midale | city | Montana | United States | 47.90 | -108.16 | 2788 | |
| Midby (historical) | city | Montana | United States | 48.77 | -104.69 | 2053 | |
| Middle Creek (historical) | city | Montana | United States | 45.70 | -111.17 | 5029 | |
| Midland (historical) | city | Montana | United States | 45.68 | -104.06 | 3349 | |
| Midway | city | Montana | United States | 47.52 | -104.32 | 1994 | |
| Midway (historical) | city | Montana | United States | 48.10 | -111.88 | 3599 | |
| Midway (historical) | city | Montana | United States | 48.03 | -106.46 | 2066 | |
| Midway (historical) | city | Montana | United States | 48.55 | -106.45 | 2683 | |
| Mike Horse (historical) | city | Montana | United States | 47.03 | -112.36 | 5869 | |
| Mikesell Trailer Court | city | Montana | United States | 46.54 | -110.91 | 5029 | |
| Mildred | city | Montana | United States | 46.68 | -104.96 | 2509 | |
| Miles City | city | Montana | United States | 46.41 | -105.84 | 2509 | |
| Miles Crossing | city | Montana | United States | 48.48 | -107.15 | 2509 | |
| Miles Crossing | city | Montana | United States | 46.01 | -112.73 | 5400 | |
| Milford Colony | city | Montana | United States | 47.33 | -112.21 | 4389 | |
| Mill Creek | city | Montana | United States | 46.10 | -112.88 | 5196 | |
| Mill Iron | city | Montana | United States | 45.85 | -104.22 | 3349 | |
| Millegan | city | Montana | United States | 47.02 | -111.37 | 5029 | |
| Miller | city | Montana | United States | 46.89 | -113.78 | 4376 | |
| Miller Colony | city | Montana | United States | 47.93 | -112.29 | 4189 | |
| Mills Springs (historical) | city | Montana | United States | 48.91 | -115.05 | 2598 | |
| Milltown | city | Montana | United States | 46.87 | -113.88 | 3349 | |
| Mine Creek | city | Montana | United States | 46.11 | -112.88 | 5157 | |
| Miner | city | Montana | United States | 45.20 | -110.91 | 5180 | |
| Mink (historical) | city | Montana | United States | 47.35 | -105.27 | 3349 | |
| Minneota (historical) | city | Montana | United States | 48.89 | -110.66 | 3349 | |
| Minnesota Addition | city | Montana | United States | 45.66 | -110.56 | 4501 | |
| Minnesota Settlement (historical) | city | Montana | United States | 48.81 | -109.11 | 2798 | |
| Minnie Rahn Place | city | Montana | United States | 45.63 | -110.44 | 6023 | |
| Minot (historical) | city | Montana | United States | 48.02 | -106.51 | 2509 | |
| Mission Meadows Trailer Park | city | Montana | United States | 47.57 | -114.11 | 3349 | |
| Missoula | city | Montana | United States | 46.87 | -113.99 | 3349 | |
| Missouri Flats (historical) | city | Montana | United States | 44.80 | -111.53 | 6709 | |
| Missouri Meadows Trailer Park | city | Montana | United States | 47.48 | -111.31 | 3398 | |
| Mizpah | city | Montana | United States | 46.24 | -105.27 | 2549 | |
| Mobile City Home Park | city | Montana | United States | 46.61 | -112.06 | 4189 | |
| Mobile City Trailer Park | city | Montana | United States | 46.88 | -114.02 | 3349 | |
| Mobridge (historical) | city | Montana | United States | 47.62 | -108.68 | 2509 | |
| Moccasin | city | Montana | United States | 47.05 | -109.91 | 4189 | |
| Moes Trailer Court | city | Montana | United States | 48.10 | -105.63 | 2060 | |
| Moiese | city | Montana | United States | 47.37 | -114.27 | 2677 | |
| Molt | city | Montana | United States | 45.86 | -108.93 | 4189 | |
| Mona (historical) | city | Montana | United States | 47.97 | -104.70 | 2509 | |
| Monarch | city | Montana | United States | 47.10 | -110.84 | 5029 | |
| Monforton (historical) | city | Montana | United States | 45.68 | -111.17 | 5029 | |
| Monida | city | Montana | United States | 44.56 | -112.31 | 6961 | |
| Montague | city | Montana | United States | 47.68 | -110.45 | 3398 | |
| Montana City | city | Montana | United States | 46.54 | -111.93 | 4199 | |
| Montanapolis Springs (historical) | city | Montana | United States | 45.31 | -110.57 | 5869 | |
| Montaqua | city | Montana | United States | 45.51 | -108.90 | 3559 | |
| Moon Creek (historical) | city | Montana | United States | 46.19 | -106.05 | 3349 | |
| Moore | city | Montana | United States | 46.98 | -109.70 | 4189 | |
| Moores (historical) | city | Montana | United States | 45.27 | -105.60 | 3349 | |
| Moorhead | city | Montana | United States | 45.06 | -105.87 | 3349 | |
| Moose Town | city | Montana | United States | 45.78 | -112.57 | 6932 | |
| Moosehorn (historical) | city | Montana | United States | 45.54 | -113.74 | 6801 | |
| Morel | city | Montana | United States | 46.15 | -112.77 | 5200 | |
| Morgan | city | Montana | United States | 48.99 | -107.83 | 2798 | |
| Mosby | city | Montana | United States | 46.99 | -107.88 | 2539 | |
| Moss Agate | city | Montana | United States | 46.37 | -110.83 | 5400 | |
| Mossmain | city | Montana | United States | 45.68 | -108.71 | 3349 | |
| Mouat (historical) | city | Montana | United States | 45.35 | -109.92 | 6200 | |
| Moulton | city | Montana | United States | 47.35 | -109.35 | 3704 | |
| Mount Aqua Trailer Court | city | Montana | United States | 45.52 | -108.86 | 3464 | |
| Mount Jumbo Trailer Court | city | Montana | United States | 46.87 | -113.94 | 3349 | |
| Mountain Acres Mobile Home Park | city | Montana | United States | 47.07 | -109.43 | 4189 | |
| Mountain Shadows Estates | city | Montana | United States | 46.50 | -114.09 | 3398 | |
| Mountain Valley Trailer Court | city | Montana | United States | 46.23 | -112.13 | 5029 | |
| Mountain View | city | Montana | United States | 45.39 | -109.90 | 6814 | |
| Mountain View (historical) | city | Montana | United States | 47.64 | -114.08 | 3349 | |
| Mountain View Court | city | Montana | United States | 46.88 | -113.89 | 3349 | |
| Mountain View Mobile Home Park | city | Montana | United States | 48.22 | -114.28 | 3349 | |
| Mountain View Mobile Home Park | city | Montana | United States | 48.89 | -115.06 | 2598 | |
| Mountain View Trailer Court | city | Montana | United States | 46.27 | -114.16 | 3599 | |
| Mountain View Trailer Court | city | Montana | United States | 45.20 | -109.25 | 5869 | |
| Mountain View Trailer Court | city | Montana | United States | 46.60 | -111.93 | 4189 | |
| Moyne | city | Montana | United States | 46.26 | -110.88 | 5400 | |
| Mud Lake (historical) | city | Montana | United States | 48.12 | -114.00 | 3349 | |
| Muddy | city | Montana | United States | 45.62 | -106.76 | 3375 | |
| Muir | city | Montana | United States | 45.66 | -110.79 | 5869 | |
| Murphys Trailer Court | city | Montana | United States | 45.89 | -111.55 | 4189 | |
| Murray Place | city | Montana | United States | 47.81 | -107.07 | 2572 | |
| Murray Trailer Park | city | Montana | United States | 48.35 | -107.87 | 2509 | |
| Muscleshell City (historical) | city | Montana | United States | 47.46 | -107.91 | 2509 | |
| Musselshell | city | Montana | United States | 46.52 | -108.09 | 3349 | |
| Myers | city | Montana | United States | 46.25 | -107.34 | 2851 |