Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Manson (historical) | Locale | 1085 | Pondera | 48 14 15 N | 112 00 23 W |
| Manson Post Office (historical) | Post Office | 1085 | Pondera | 48 14 15 N | 112 00 23 W |
| Manson School (historical) | School | 1085 | Pondera | 48 14 15 N | 112 00 23 W |
| Manternach Coulee | Valley | | Daniels | 48 44 00 N | 105 26 23 W |
| Mantle Ditch | Canal | 1567 | Beaverhead | 45 25 47 N | 112 40 20 W |
| Mantle East Mine | Mine | 1775 | Jefferson | 46 17 26 N | 112 14 24 W |
| Mantle Mine | Mine | 1763 | Jefferson | 46 17 29 N | 112 14 31 W |
| Mantle Ranch | Locale | 1550 | Beaverhead | 45 26 13 N | 112 39 47 W |
| Manton Coulee | Valley | | Liberty | 48 29 31 N | 110 56 18 W |
| Mantrap Fork | Stream | | Sanders | 47 53 40 N | 115 11 22 W |
| Manual Oakley Group Dam | Dam | 1164 | Teton | 47 41 30 N | 111 56 27 W |
| Manuel Lisa Fishing Access Site | Locale | 841 | Yellowstone | 46 08 44 N | 107 28 17 W |
| Manuel Number 1 Dam | Dam | 885 | Petroleum | 47 06 12 N | 108 08 50 W |
| Manuel Number 2 Dam | Dam | 914 | Petroleum | 47 05 48 N | 108 09 14 W |
| Many Falls Trail | Trail | 1401 | Glacier | 48 40 17 N | 113 36 34 W |
| Many Glacier | Locale | 1496 | Glacier | 48 48 03 N | 113 39 24 W |
| Many Glacier Campground | Locale | 1503 | Glacier | 48 47 45 N | 113 40 38 W |
| Many Glacier Entrance Station | Locale | 1484 | Glacier | 48 49 21 N | 113 34 44 W |
| Many People Dam | Dam | 897 | Blaine | 48 13 54 N | 108 48 57 W |
| Many Pines Campground | Locale | 1871 | Cascade | 46 53 56 N | 110 41 17 W |
| Maple Creek | Stream | | Missoula | 46 41 41 N | 114 04 11 W |
| Mapleton Mine | Mine | 1800 | Madison | 45 19 35 N | 111 58 19 W |
| Maplewood Cemetery | Cemetery | 1011 | Ravalli | 46 30 15 N | 114 05 50 W |
| Maplewood Manor Personal Care Home | Hospital | 995 | Missoula | 46 52 15 N | 113 56 40 W |
| Mar-Le Villa | Populated Place | 894 | Flathead | 48 10 54 N | 114 17 31 W |
| Maranatha Baptist Church | Church | 1185 | Lewis and Clark | 46 35 23 N | 111 54 56 W |
| Marantha Center | Church | 995 | Valley | 48 51 24 N | 106 24 26 W |
| Maraschino Dam | Dam | 761 | Valley | 48 23 24 N | 106 38 26 W |
| Marathon Dam | Dam | 1208 | Glacier | 48 55 12 N | 112 28 09 W |
| Marble Creek | Stream | | Mineral | 47 14 00 N | 115 02 57 W |
| Marble Lake | Lake | 2289 | Gallatin | 45 05 44 N | 111 16 06 W |
| Marble Park | Flat | 2308 | Powell | 46 19 03 N | 112 56 57 W |
| Marble Point | Ridge | 1650 | Mineral | 47 12 51 N | 115 03 32 W |
| Marble Point | Summit | 2453 | Gallatin | 45 04 37 N | 111 14 10 W |
| Marcella Creek | Stream | | Granite | 46 42 45 N | 113 31 08 W |
| Marcelline Mine | Mine | 1808 | Judith Basin | 47 04 47 N | 110 38 07 W |
| Marceys Park | Park | 767 | Rosebud | 46 16 10 N | 106 40 48 W |
| Marcheta Lake | Lake | 2775 | Madison | 45 23 52 N | 111 29 17 W |
| Marcia Hosaeus Health and Physical Education Complex | Building | 1498 | Gallatin | 45 39 57 N | 111 02 45 W |
| Marco (historical) | Locale | 608 | Dawson | 47 18 41 N | 104 29 33 W |
| Marco Flat Bridge | Bridge | 996 | Missoula | 46 53 23 N | 113 50 00 W |
| Marco Flat Picnic Area | Park | 1020 | Missoula | 46 53 30 N | 113 49 34 W |
| Marco Flats Fishing Access Site | Locale | 1017 | Missoula | 46 53 28 N | 113 49 38 W |
| Marco Post Office (historical) | Post Office | 608 | Dawson | 47 18 41 N | 104 29 33 W |
| Marcott Creek | Stream | | Fergus | 46 56 53 N | 109 17 47 W |
| Marcum Mountain | Summit | 1878 | Powell | 46 58 05 N | 112 56 39 W |
| Marcus Daly Mansion Historical Marker | Park | 1093 | Ravalli | 46 15 58 N | 114 08 06 W |
| Marcus Daly Memorial Hospital | Hospital | 1087 | Ravalli | 46 14 53 N | 114 10 01 W |
| Marcus Daly Statue | Park | 1763 | Silver Bow | 46 00 45 N | 112 33 23 W |
| Marcys School (historical) | School | 791 | Rosebud | 46 15 10 N | 106 41 39 W |
| Mardis Ranch | Locale | 823 | Rosebud | 46 20 41 N | 106 50 34 W |
| Mare Pasture Gulch | Valley | | Rosebud | 45 12 12 N | 106 29 36 W |
| Marent Gulch | Valley | | Missoula | 47 00 12 N | 114 07 27 W |
| Marent Trestle | Bridge | 1048 | Missoula | 47 00 12 N | 114 07 27 W |
| Mares (historical) | Locale | 1200 | Lewis and Clark | 46 36 35 N | 112 03 33 W |
| Marey An Mine | Mine | 2464 | Jefferson | 46 21 22 N | 112 16 01 W |
| Margaret Creek | Stream | | Flathead | 48 21 12 N | 113 53 17 W |
| Margaret Hays Number 1 Dam | Dam | 701 | McCone | 47 49 48 N | 106 00 32 W |
| Margaret Lake | Lake | 1733 | Flathead | 48 05 17 N | 113 48 31 W |
| Margaret Lake | Lake | 1700 | Glacier | 48 51 51 N | 113 48 53 W |
| Margaret Lake | Lake | 2471 | Park | 45 00 58 N | 109 49 50 W |
| Margaret Leary School | School | 1695 | Silver Bow | 45 57 40 N | 112 31 17 W |
| Margo Lake | Lake | 2619 | Madison | 45 23 46 N | 111 27 03 W |
| Marguerite Mine | Mine | 2160 | Jefferson | 46 18 41 N | 112 16 29 W |
| Marguerite Mine | Mine | 2208 | Jefferson | 46 18 30 N | 112 16 31 W |
| Mariah Meadows | Flat | 1988 | Deer Lodge | 45 53 30 N | 113 02 53 W |
| Mariane Lake | Lake | 2909 | Carbon | 45 03 36 N | 109 45 46 W |
| Marias (historical) | Locale | 786 | Chouteau | 47 56 30 N | 110 31 53 W |
| Marias Fairground | Locale | 996 | Toole | 48 29 35 N | 111 50 17 W |
| Marias Hereford Ranch Number 30 Dam | Dam | 1085 | Pondera | 48 17 54 N | 111 40 33 W |
| Marias Mountain | Summit | 1704 | Lincoln | 48 56 32 N | 115 18 55 W |
| Marias Museum of History and Art | Building | 1018 | Toole | 48 30 30 N | 111 52 12 W |
| Marias Pass | Gap | 1596 | Glacier | 48 18 60 N | 113 21 17 W |
| Marias Post Office (historical) | Post Office | 940 | Liberty | 48 12 08 N | 110 54 41 W |
| Marias River | Stream | | Chouteau | 47 55 46 N | 110 28 21 W |
| Marias River Historical Marker | Park | 787 | Chouteau | 47 55 52 N | 110 30 28 W |
| Marias School (historical) | School | 1127 | Glacier | 48 31 07 N | 112 13 38 W |
| Marias School (historical) | School | 940 | Liberty | 48 12 08 N | 110 54 41 W |
| Marias Valley Golf and Country Club | Locale | 949 | Toole | 48 25 54 N | 111 54 40 W |
| Marie (historical) | Locale | 1930 | Jefferson | 46 04 02 N | 112 26 06 W |
| Marie Creek | Stream | | Park | 45 18 47 N | 110 17 46 W |
| Marie Mine | Mine | 1813 | Carbon | 45 04 11 N | 108 26 32 W |
| Marie Mine | Mine | 1839 | Carbon | 45 04 12 N | 108 26 26 W |
| Marietta Mine | Mine | 2358 | Madison | 45 12 58 N | 111 57 42 W |
| Marietta Mine | Mine | 2488 | Madison | 45 12 60 N | 111 57 07 W |
| Marine Dam | Dam | 845 | Lake | 47 37 36 N | 114 32 15 W |
| Mariner School (historical) | School | 900 | Hill | 48 47 56 N | 110 25 25 W |
| Mariners Haven | Locale | 793 | Lincoln | 48 53 25 N | 115 11 14 W |
| Marion | Populated Place | 1202 | Flathead | 48 06 20 N | 114 39 47 W |
| Marion (historical) | Locale | 1200 | Flathead | 48 06 22 N | 114 38 48 W |
| Marion Branch Library | Building | 1202 | Flathead | 48 06 20 N | 114 39 47 W |
| Marion Coulee | Valley | | Cascade | 47 18 22 N | 110 49 50 W |
| Marion Creek | Stream | | Flathead | 48 16 13 N | 113 37 53 W |
| Marion Creek | Stream | | Missoula | 47 09 44 N | 114 33 31 W |
| Marion Fire Station | Building | 1206 | Flathead | 48 05 56 N | 114 38 48 W |
| Marion Hills Country Club | Locale | 698 | Phillips | 48 20 35 N | 107 53 42 W |
| Marion Lake | Lake | 1803 | Flathead | 48 15 58 N | 113 40 29 W |
| Marion Post Office | Post Office | 1200 | Flathead | 48 06 22 N | 114 38 48 W |
| Marion School | School | 1200 | Flathead | 48 06 12 N | 114 39 47 W |
| Mariposa Post Office (historical) | Post Office | 1760 | Granite | 46 12 47 N | 113 33 01 W |
| Marker Lake | Lake | 3314 | Carbon | 45 06 50 N | 109 36 15 W |
| Market Gulch | Valley | | Lewis and Clark | 46 40 37 N | 111 47 15 W |
| Markle Cemetery | Cemetery | 872 | Sanders | 47 34 24 N | 114 37 15 W |
| Markle Hill | Summit | 1271 | Sanders | 47 32 46 N | 114 37 52 W |
| Markle Pass | Gap | 1013 | Sanders | 47 33 01 N | 114 37 12 W |
| Markles Point | Cape | 694 | Valley | 47 59 26 N | 106 29 01 W |
| Marks Ranch | Locale | 1196 | Broadwater | 46 23 35 N | 111 26 44 W |
| Marl Creek | Stream | | Lincoln | 48 09 11 N | 115 05 56 W |
| Marl Lake | Lake | 1000 | Lincoln | 48 44 29 N | 114 57 18 W |
| Marl Lake Creek | Stream | | Lincoln | 48 45 24 N | 114 58 37 W |