Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Midway Dam | Dam | 799 | Valley | 48 32 10 N | 106 27 43 W |
| Midway Express Access Ski Trail | Trail | 2528 | Carbon | 45 11 15 N | 109 21 03 W |
| Midway Grange | Locale | 936 | Flathead | 48 22 14 N | 114 16 24 W |
| Midway School (historical) | School | 1056 | Cascade | 47 27 30 N | 111 05 18 W |
| Midway School (historical) | School | 986 | Chouteau | 48 06 13 N | 111 17 18 W |
| Midway School (historical) | School | 1109 | Pondera | 48 06 02 N | 111 52 53 W |
| Midway School (historical) | School | 608 | Richland | 47 30 55 N | 104 19 10 W |
| Midway School (historical) | School | 815 | Valley | 48 33 10 N | 106 27 13 W |
| Miewald School (historical) | School | 821 | Blaine | 48 31 53 N | 109 22 39 W |
| Mifflin Creek | Stream | | Beaverhead | 45 30 46 N | 113 36 56 W |
| Migration Creek | Stream | | Gallatin | 44 56 09 N | 111 05 47 W |
| Mikado Post Office (historical) | Post Office | 1163 | Fergus | 46 46 55 N | 108 43 33 W |
| Mike | Locale | 867 | Treasure | 46 07 60 N | 107 06 30 W |
| Mike Creek | Stream | | Missoula | 46 51 20 N | 114 26 17 W |
| Mike Creek | Stream | | Ravalli | 46 03 23 N | 114 10 03 W |
| Mike Day Creek | Stream | | Meagher | 46 17 23 N | 110 58 48 W |
| Mike Horse | Reservoir | 1660 | Lewis and Clark | 47 01 42 N | 112 21 15 W |
| Mike Horse (historical) | Populated Place | 1718 | Lewis and Clark | 47 01 35 N | 112 21 38 W |
| Mike Horse Creek | Stream | | Lewis and Clark | 47 01 45 N | 112 21 17 W |
| Mike Horse Mine | Mine | 1730 | Lewis and Clark | 47 01 31 N | 112 21 42 W |
| Mike Horse Mine | Mine | 1268 | Lewis and Clark | 48 01 37 N | 112 21 43 W |
| Mike Horse Mine Dam | Dam | 1660 | Lewis and Clark | 47 01 42 N | 112 21 15 W |
| Mike Horse Post Office (historical) | Post Office | 1718 | Lewis and Clark | 47 01 35 N | 112 21 38 W |
| Mike Horse School (historical) | School | 1718 | Lewis and Clark | 47 01 35 N | 112 21 38 W |
| Mike Murray Ridge | Ridge | 1759 | Jefferson | 46 24 44 N | 111 54 29 W |
| Mike Renig Gulch | Valley | | Powell | 46 32 27 N | 112 23 16 W |
| Mikels (historical) | Locale | 1806 | Jefferson | 45 54 45 N | 112 20 31 W |
| Mikes Creek | Stream | | Lake | 47 18 24 N | 114 02 57 W |
| Mikes Pond | Lake | 946 | Lake | 47 53 05 N | 114 17 59 W |
| Mikesell Trailer Court | Populated Place | 1530 | Meagher | 46 32 40 N | 110 54 33 W |
| Mildred | Locale | 721 | Prairie | 46 40 36 N | 104 57 39 W |
| Mildred | Populated Place | 723 | Prairie | 46 40 33 N | 104 57 36 W |
| Mildred Community Church | Church | 723 | Prairie | 46 40 34 N | 104 57 26 W |
| Mildred Number 1 Dam | Dam | 945 | Fallon | 46 27 42 N | 104 14 56 W |
| Mildred Post Office (historical) | Post Office | 723 | Prairie | 46 40 36 N | 104 57 32 W |
| Mildred School (historical) | School | 723 | Prairie | 46 40 35 N | 104 57 30 W |
| Mile Creek | Stream | | Fallon | 46 12 18 N | 104 44 07 W |
| Mile Creek | Stream | | Madison | 44 49 32 N | 111 29 58 W |
| Milepost Lake | Lake | 2131 | Ravalli | 46 02 23 N | 114 29 59 W |
| Miles (historical) | Locale | 971 | Flathead | 48 25 05 N | 114 02 46 W |
| Miles (historical) | Locale | 997 | Ravalli | 46 36 38 N | 114 05 23 W |
| Miles (historical) | Locale | 1611 | Silver Bow | 46 00 45 N | 112 43 34 W |
| Miles Avenue School | School | 979 | Yellowstone | 45 46 28 N | 108 33 26 W |
| Miles Butte | Summit | 1505 | Blaine | 48 15 54 N | 109 03 17 W |
| Miles City | Locale | 724 | Custer | 46 24 10 N | 105 50 56 W |
| Miles City | Populated Place | 722 | Custer | 46 24 30 N | 105 50 26 W |
| Miles City Air Force Station (historical) | Military (Historical) | | Custer | 46 17 48 N | 105 58 43 W |
| Miles City Creek | Stream | | Custer | 46 00 04 N | 105 22 47 W |
| Miles City Creek | Stream | | Fallon | 46 15 45 N | 104 45 13 W |
| Miles City Fire Department | Building | 727 | Custer | 46 24 30 N | 105 48 25 W |
| Miles City Fish Hatchery | Locale | 725 | Custer | 46 23 02 N | 105 51 42 W |
| Miles City KOA Campground | Locale | 723 | Custer | 46 24 21 N | 105 51 25 W |
| Miles City Plaza Shopping Center | Locale | 717 | Custer | 46 24 50 N | 105 49 50 W |
| Miles City Police Department | Building | 720 | Custer | 46 24 27 N | 105 50 41 W |
| Miles City Post Office | Post Office | 720 | Custer | 46 24 28 N | 105 51 00 W |
| Miles City Public Library | Building | 720 | Custer | 46 24 25 N | 105 50 45 W |
| Miles City Sewage Disposal Pond Number 1 Dam | Dam | 719 | Custer | 46 25 42 N | 105 49 50 W |
| Miles City Sewage Disposal Pond Number 2 Dam | Dam | 715 | Custer | 46 25 42 N | 105 49 26 W |
| Miles City Sewage Disposal Pond Number 3 Dam | Dam | 715 | Custer | 46 25 48 N | 105 49 08 W |
| Miles City Town and Country Club | Locale | 727 | Custer | 46 23 45 N | 105 50 42 W |
| Miles City Vision Clinic | Hospital | 722 | Custer | 46 24 30 N | 105 50 55 W |
| Miles City Wesleyan Church | Church | 716 | Custer | 46 24 57 N | 105 50 46 W |
| Miles Community College | School | 724 | Custer | 46 24 20 N | 105 49 35 W |
| Miles Creek | Stream | | Blaine | 48 21 56 N | 109 13 22 W |
| Miles Creek | Stream | | Custer | 46 04 52 N | 105 55 29 W |
| Miles Creek | Stream | | Custer | 46 37 12 N | 105 33 49 W |
| Miles Creek | Stream | | Gallatin | 45 52 30 N | 110 46 20 W |
| Miles Crossing | Populated Place | 1611 | Silver Bow | 46 00 45 N | 112 43 34 W |
| Miles Crossing | Populated Place | 655 | Valley | 48 28 54 N | 107 09 06 W |
| Miles Flower Ditch | Canal | 1482 | Sweet Grass | 45 38 47 N | 110 06 31 W |
| Miles Gulch | Valley | | Powell | 46 34 06 N | 112 21 59 W |
| Miles Gulch | Valley | | Sweet Grass | 45 39 37 N | 110 05 43 W |
| Miles Park | Park | 1367 | Park | 45 39 18 N | 110 33 13 W |
| Miley School | School | 822 | Chouteau | 48 10 24 N | 110 06 45 W |
| Milford Colony | Populated Place | 1287 | Lewis and Clark | 47 19 47 N | 112 12 35 W |
| Milford Colony Dam | Dam | 1292 | Lewis and Clark | 47 21 36 N | 112 10 09 W |
| Milk Coulee Bay | Bay | 686 | McCone | 48 00 30 N | 106 22 09 W |
| Milk Creek | Stream | | Fallon | 46 09 53 N | 104 43 03 W |
| Milk Creek | Stream | | Flathead | 47 56 02 N | 113 18 57 W |
| Milk Creek | Stream | | Phillips | 48 25 24 N | 108 20 26 W |
| Milk River | Stream | | Valley | 48 03 26 N | 106 19 07 W |
| Milk River - Dodson Dam Unit Wildlife Management Area | Park | 727 | Phillips | 48 25 27 N | 108 18 12 W |
| Milk River Badlands | Area | 807 | Hill | 48 34 60 N | 109 46 33 W |
| Milk River Bridge | Bridge | 698 | Blaine | 48 26 37 N | 108 25 30 W |
| Milk River Bridge | Bridge | 719 | Blaine | 48 33 02 N | 108 54 13 W |
| Milk River Bridge | Bridge | 723 | Blaine | 48 34 48 N | 109 02 28 W |
| Milk River Bridge | Bridge | 686 | Phillips | 48 21 50 N | 108 05 00 W |
| Milk River Bridge | Bridge | 683 | Phillips | 48 21 49 N | 107 52 25 W |
| Milk River Bridge | Bridge | 625 | Valley | 48 09 05 N | 106 30 42 W |
| Milk River Canal A | Canal | 714 | Blaine | 48 29 01 N | 108 44 46 W |
| Milk River Coulee | Valley | | McCone | 48 01 07 N | 106 20 34 W |
| Milk River Coulee | Valley | | Valley | 48 06 00 N | 106 16 08 W |
| Milk River Ford Bridge | Bridge | 665 | Phillips | 48 32 26 N | 107 31 09 W |
| Milk River Hills | Range | 804 | McCone | 48 01 43 N | 106 18 07 W |
| Milk River Mine | Mine | 779 | Blaine | 48 37 59 N | 109 18 17 W |
| Milk River Mine School (historical) | School | 750 | Blaine | 48 37 35 N | 109 17 19 W |
| Milk River Ridge | Ridge | 1693 | Glacier | 48 38 40 N | 113 14 44 W |
| Milk River School (historical) | School | 685 | Phillips | 48 24 48 N | 107 49 24 W |
| Milk River Valley Church | Church | 850 | Hill | 48 40 43 N | 110 13 33 W |
| Milk Springs | Spring | 1247 | Fergus | 46 55 60 N | 108 41 01 W |
| Milky Stream | Stream | | Lewis and Clark | 47 15 23 N | 112 35 09 W |
| Mill Building | Building | 1761 | Silver Bow | 46 00 41 N | 112 33 27 W |
| Mill Canyon | Valley | | Madison | 45 41 47 N | 112 07 32 W |
| Mill Coulee | Stream | | Cascade | 47 05 21 N | 111 36 17 W |
| Mill Coulee Canal | Canal | 1162 | Cascade | 47 33 30 N | 111 51 04 W |
| Mill Coulee Creek | Stream | | Cascade | 47 31 43 N | 111 41 12 W |
| Mill Creek | Populated Place | 1588 | Deer Lodge | 46 06 02 N | 112 53 03 W |
| Mill Creek | Stream | | Cascade | 47 02 15 N | 111 03 55 W |
| Mill Creek | Stream | | Custer | 46 18 28 N | 105 46 24 W |
| Mill Creek | Stream | | Deer Lodge | 46 06 58 N | 112 48 20 W |