| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| MacGregor (historical) | city | Idaho | United States | 44.69 | -116.08 | 5029 | |
| Mace | city | Idaho | United States | 47.52 | -115.82 | 5029 | |
| Mackay | city | Idaho | United States | 43.91 | -113.61 | 5935 | |
| Mackay Bar | city | Idaho | United States | 45.38 | -115.51 | 2870 | |
| Macon | city | Idaho | United States | 43.33 | -114.55 | 5029 | |
| Maddens | city | Idaho | United States | 43.66 | -116.60 | 2509 | |
| Magic | city | Idaho | United States | 43.26 | -114.39 | 5029 | |
| Magic City | city | Idaho | United States | 43.29 | -114.37 | 5029 | |
| Magic Resort | city | Idaho | United States | 43.28 | -114.39 | 5029 | |
| Malad City | city | Idaho | United States | 42.19 | -112.25 | 4576 | |
| Malta | city | Idaho | United States | 42.31 | -113.37 | 4507 | |
| Manson | city | Idaho | United States | 42.57 | -111.50 | 5869 | |
| Mapleton | city | Idaho | United States | 42.08 | -111.75 | 5029 | |
| Marble Creek | city | Idaho | United States | 47.25 | -116.03 | 3349 | |
| Marion | city | Idaho | United States | 42.29 | -113.91 | 4501 | |
| Mark | city | Idaho | United States | 43.78 | -111.83 | 5029 | |
| Marley | city | Idaho | United States | 43.02 | -114.23 | 4215 | |
| Marsh (historical) | city | Idaho | United States | 43.92 | -116.34 | 2913 | |
| Marsh Valley | city | Idaho | United States | 42.52 | -112.16 | 5029 | |
| Marsing | city | Idaho | United States | 43.55 | -116.81 | 2509 | |
| Martin | city | Idaho | United States | 43.52 | -113.57 | 5869 | |
| Marysville | city | Idaho | United States | 44.07 | -111.42 | 5347 | |
| Mashburn | city | Idaho | United States | 47.18 | -116.50 | 2818 | |
| Masonia (historical) | city | Idaho | United States | 47.45 | -116.18 | 3349 | |
| May | city | Idaho | United States | 44.60 | -113.91 | 5141 | |
| May Place | city | Idaho | United States | 42.20 | -114.89 | 5298 | |
| Mayfield | city | Idaho | United States | 43.42 | -115.90 | 3599 | |
| Mc Arthur | city | Idaho | United States | 48.52 | -116.43 | 2509 | |
| McCall | city | Idaho | United States | 44.91 | -116.10 | 5029 | |
| McCammon | city | Idaho | United States | 42.65 | -112.19 | 5029 | |
| McCarthy | city | Idaho | United States | 47.49 | -115.91 | 3349 | |
| McCrea Place | city | Idaho | United States | 45.30 | -116.48 | 5029 | |
| McDonalds | city | Idaho | United States | 47.03 | -115.15 | 5164 | |
| McDonaldville | city | Idaho | United States | 43.26 | -112.37 | 4524 | |
| McGuire | city | Idaho | United States | 47.71 | -116.99 | 2509 | |
| McHenry | city | Idaho | United States | 42.60 | -114.05 | 4189 | |
| McMillan | city | Idaho | United States | 42.54 | -114.42 | 4189 | |
| Meadow Creek | city | Idaho | United States | 48.82 | -116.16 | 2509 | |
| Meadowhurst | city | Idaho | United States | 47.32 | -116.56 | 2509 | |
| Meadows | city | Idaho | United States | 44.96 | -116.24 | 4189 | |
| Meadowville | city | Idaho | United States | 42.76 | -111.60 | 6099 | |
| Medimont | city | Idaho | United States | 47.48 | -116.60 | 2509 | |
| Melba | city | Idaho | United States | 43.38 | -116.53 | 2664 | |
| Melrose | city | Idaho | United States | 46.41 | -116.45 | 3349 | |
| Menan | city | Idaho | United States | 43.72 | -111.99 | 5029 | |
| Meridian | city | Idaho | United States | 43.61 | -116.39 | 2624 | |
| Mesa | city | Idaho | United States | 44.63 | -116.45 | 3349 | |
| Mexican Place | city | Idaho | United States | 45.81 | -116.51 | 4386 | |
| Mica | city | Idaho | United States | 47.62 | -116.87 | 2555 | |
| Michaud | city | Idaho | United States | 42.89 | -112.61 | 4455 | |
| Midasville | city | Idaho | United States | 45.56 | -115.47 | 5869 | |
| Middleton | city | Idaho | United States | 43.71 | -116.62 | 2509 | |
| Midnight | city | Idaho | United States | 44.92 | -115.33 | 6709 | |
| Midvale | city | Idaho | United States | 44.47 | -116.73 | 2598 | |
| Midway | city | Idaho | United States | 43.71 | -112.00 | 5029 | |
| Midway | city | Idaho | United States | 43.63 | -116.63 | 2509 | |
| Miller Creek Settlement | city | Idaho | United States | 42.08 | -116.13 | 5869 | |
| Milltown | city | Idaho | United States | 47.32 | -116.54 | 2614 | |
| Milner | city | Idaho | United States | 42.52 | -114.02 | 4202 | |
| Milo | city | Idaho | United States | 43.61 | -111.88 | 5029 | |
| Mineral | city | Idaho | United States | 44.57 | -117.08 | 3484 | |
| Minidoka | city | Idaho | United States | 42.75 | -113.49 | 4281 | |
| Mink Creek | city | Idaho | United States | 42.23 | -111.72 | 5298 | |
| Mitchell | city | Idaho | United States | 43.40 | -112.11 | 5029 | |
| Mohler | city | Idaho | United States | 46.29 | -116.35 | 3349 | |
| Monteview | city | Idaho | United States | 43.97 | -112.54 | 5029 | |
| Montour | city | Idaho | United States | 43.92 | -116.33 | 2598 | |
| Montpelier | city | Idaho | United States | 42.32 | -111.30 | 5977 | |
| Moody | city | Idaho | United States | 43.84 | -111.63 | 5180 | |
| Moore | city | Idaho | United States | 43.74 | -113.37 | 5869 | |
| Moose City | city | Idaho | United States | 46.79 | -115.11 | 4189 | |
| Mora | city | Idaho | United States | 43.46 | -116.35 | 2798 | |
| Moravia | city | Idaho | United States | 48.65 | -116.38 | 1998 | |
| Moreland | city | Idaho | United States | 43.22 | -112.44 | 4494 | |
| Morgan | city | Idaho | United States | 43.06 | -111.93 | 5869 | |
| Morgan Place | city | Idaho | United States | 43.11 | -116.27 | 2509 | |
| Morrow | city | Idaho | United States | 46.13 | -116.52 | 4199 | |
| Morton | city | Idaho | United States | 48.20 | -116.69 | 2526 | |
| Moscow | city | Idaho | United States | 46.73 | -117.00 | 2598 | |
| Moss | city | Idaho | United States | 43.62 | -116.62 | 2509 | |
| Mound Valley | city | Idaho | United States | 42.36 | -111.71 | 5055 | |
| Mount Idaho | city | Idaho | United States | 45.90 | -116.08 | 4189 | |
| Mountain Home | city | Idaho | United States | 43.13 | -115.69 | 3349 | |
| Mountain Home (historical) | city | Idaho | United States | 47.02 | -116.93 | 2762 | |
| Mowry | city | Idaho | United States | 47.31 | -117.00 | 2690 | |
| Moyie Springs | city | Idaho | United States | 48.73 | -116.19 | 1807 | |
| Mozart | city | Idaho | United States | 47.41 | -116.94 | 2700 | |
| Mud Lake | city | Idaho | United States | 43.84 | -112.48 | 5029 | |
| Mud Springs | city | Idaho | United States | 45.86 | -115.59 | 5029 | |
| Mullan | city | Idaho | United States | 47.47 | -115.80 | 3599 | |
| Murphy | city | Idaho | United States | 43.22 | -116.55 | 2893 | |
| Murphy Hot Springs | city | Idaho | United States | 42.03 | -115.37 | 5200 | |
| Murray | city | Idaho | United States | 47.63 | -115.86 | 3349 | |
| Murtaugh | city | Idaho | United States | 42.49 | -114.16 | 4189 | |
| Musselshell | city | Idaho | United States | 46.36 | -115.74 | 3349 | |
| Myers | city | Idaho | United States | 42.61 | -113.75 | 4189 | |
| Myrtle | city | Idaho | United States | 46.50 | -116.73 | 1669 |