Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Middle Fork Lena Creek | Stream | | Park | 46 06 15 N | 110 32 28 W |
| Middle Fork Little Belt Creek | Stream | | Cascade | 47 24 41 N | 110 39 24 W |
| Middle Fork Little Creek | Stream | | Lewis and Clark | 46 59 39 N | 112 07 25 W |
| Middle Fork Little Peoples Creek | Stream | | Phillips | 47 58 02 N | 108 37 29 W |
| Middle Fork Lodgepole Creek | Stream | | Garfield | 47 15 57 N | 107 41 28 W |
| Middle Fork Lone Tree Creek | Stream | | Valley | 47 58 47 N | 107 07 09 W |
| Middle Fork Maiden Creek | Stream | | Beaverhead | 44 51 09 N | 113 12 17 W |
| Middle Fork McGuire Creek | Stream | | McCone | 47 34 49 N | 105 59 53 W |
| Middle Fork Milk River | Stream | | Glacier | 48 51 21 N | 113 01 10 W |
| Middle Fork Mill Creek | Stream | | Madison | 45 29 31 N | 111 59 41 W |
| Middle Fork Millsite | Mine | 1866 | Silver Bow | 46 47 15 N | 112 33 13 W |
| Middle Fork Mine | Mine | 1987 | Granite | 46 29 48 N | 113 06 24 W |
| Middle Fork Mission Creek | Stream | | Lake | 47 20 27 N | 113 55 23 W |
| Middle Fork Monture Creek | Stream | | Powell | 47 16 01 N | 113 10 43 W |
| Middle Fork Moose Creek | Stream | | Silver Bow | 45 46 33 N | 112 33 24 W |
| Middle Fork Motel and RV Park | Locale | 969 | Flathead | 48 23 35 N | 114 02 13 W |
| Middle Fork Muddy Creek | Stream | | Gallatin | 46 02 05 N | 110 48 25 W |
| Middle Fork North Fork Teton River | Stream | | Teton | 47 53 21 N | 112 43 23 W |
| Middle Fork Parsnip Creek | Stream | | Lincoln | 48 40 31 N | 115 20 24 W |
| Middle Fork Pole Creek | Stream | | Madison | 45 32 13 N | 111 29 03 W |
| Middle Fork Poplar River | Stream | | Daniels | 48 49 41 N | 105 26 56 W |
| Middle Fork Porcupine Creek | Stream | | Lake | 47 50 51 N | 113 53 54 W |
| Middle Fork Porcupine Creek | Stream | | Park | 46 07 50 N | 110 30 47 W |
| Middle Fork Porcupine Creek | Stream | | Valley | 48 31 18 N | 106 29 20 W |
| Middle Fork Post Office (historical) | Post Office | 952 | Valley | 48 44 44 N | 106 31 33 W |
| Middle Fork Prairie Elk Creek | Stream | | McCone | 47 41 34 N | 105 51 36 W |
| Middle Fork Ranch | Locale | 1732 | Judith Basin | 46 50 37 N | 110 30 26 W |
| Middle Fork Ray Creek | Stream | | Broadwater | 46 23 15 N | 111 22 05 W |
| Middle Fork Remuda Creek | Stream | | McCone | 47 54 55 N | 105 54 59 W |
| Middle Fork Reservoir | Reservoir | 1720 | Wheatland | 46 39 13 N | 110 05 14 W |
| Middle Fork Revais Creek | Stream | | Sanders | 47 14 48 N | 114 24 23 W |
| Middle Fork Rickard Coulee | Valley | | Judith Basin | 46 52 51 N | 110 23 58 W |
| Middle Fork Rock Creek | Stream | | Granite | 46 07 22 N | 113 30 04 W |
| Middle Fork Rock Creek | Stream | | Park | 45 55 46 N | 110 23 48 W |
| Middle Fork Salt Creek | Stream | | Fergus | 47 26 30 N | 109 28 53 W |
| Middle Fork Sand Coulee Creek | Stream | | Cascade | 47 16 52 N | 111 05 28 W |
| Middle Fork Sand Creek | Stream | | McCone | 47 49 31 N | 105 38 01 W |
| Middle Fork Savanac Creek | Stream | | Mineral | 47 27 42 N | 115 23 13 W |
| Middle Fork Sixteenmile Creek | Stream | | Gallatin | 46 07 56 N | 111 06 39 W |
| Middle Fork Ski Trail | Trail | 1454 | Flathead | 48 29 06 N | 114 21 13 W |
| Middle Fork South Fork Rock Creek | Stream | | McCone | 47 43 06 N | 106 06 31 W |
| Middle Fork Spotted Dog Creek | Stream | | Powell | 46 30 15 N | 112 33 38 W |
| Middle Fork Spring Creek | Stream | | Big Horn | 45 47 48 N | 107 06 52 W |
| Middle Fork Squaw Creek | Stream | | Madison | 44 55 20 N | 111 33 45 W |
| Middle Fork Stone Creek | Stream | | Madison | 45 12 36 N | 112 20 46 W |
| Middle Fork Swartz Creek | Stream | | Missoula | 46 43 12 N | 113 45 49 W |
| Middle Fork Sweet Grass Creek | Stream | | Park | 46 05 23 N | 110 21 19 W |
| Middle Fork Sweet Grass Creek | Stream | | Sweet Grass | 45 54 01 N | 109 37 07 W |
| Middle Fork Tenmile Creek | Stream | | Powder River | 45 25 47 N | 106 01 26 W |
| Middle Fork Three Mile Creek | Stream | | Ravalli | 46 36 20 N | 113 55 59 W |
| Middle Fork Timber Creek | Stream | | Prairie | 47 03 26 N | 105 58 50 W |
| Middle Fork Trail Creek | Stream | | Rosebud | 45 58 34 N | 106 51 26 W |
| Middle Fork Trailhead | Locale | 1573 | Teton | 47 53 28 N | 112 43 40 W |
| Middle Fork Tullock Creek | Stream | | Big Horn | 45 40 05 N | 107 15 12 W |
| Middle Fork Two Leggins Creek | Stream | | Big Horn | 45 37 51 N | 107 47 20 W |
| Middle Fork Upper Deer Creek | Stream | | Sweet Grass | 45 37 17 N | 110 01 42 W |
| Middle Fork Warm Springs Creek | Stream | | Granite | 46 15 39 N | 113 08 14 W |
| Middle Fork Warm Springs Creek | Stream | | Jefferson | 46 25 26 N | 111 55 53 W |
| Middle Fork Warm Springs Creek | Stream | | Madison | 45 02 28 N | 111 56 21 W |
| Middle Fork West Fork Gallatin River | Stream | | Gallatin | 45 15 60 N | 111 19 18 W |
| Middle Fork Whitetail Creek | Stream | | Carter | 45 24 39 N | 104 42 22 W |
| Middle Fork Willow Creek | Stream | | Carter | 45 05 32 N | 104 42 15 W |
| Middle Fork Willow Creek | Stream | | Park | 45 46 32 N | 110 38 47 W |
| Middle Fork Wolf Creek | Stream | | Valley | 48 16 31 N | 105 47 17 W |
| Middle Fork Wounded Man Creek | Stream | | Stillwater | 45 14 02 N | 110 02 24 W |
| Middle Foy Lake | Lake | 992 | Flathead | 48 10 23 N | 114 22 10 W |
| Middle Gish Mine | Mine | 1724 | Sweet Grass | 45 28 42 N | 110 12 08 W |
| Middle Lake | Lake | 2493 | Ravalli | 45 53 31 N | 114 16 31 W |
| Middle Lake | Lake | 1142 | Teton | 47 58 60 N | 112 02 15 W |
| Middle Lexington Number 2 Mine | Mine | 2024 | Cascade | 46 57 34 N | 110 42 05 W |
| Middle Mountain | Summit | 2358 | Beaverhead | 45 25 32 N | 112 52 25 W |
| Middle Mountain | Summit | 1959 | Lincoln | 48 09 30 N | 115 58 50 W |
| Middle Mountain | Summit | 3109 | Madison | 45 35 16 N | 112 03 07 W |
| Middle Mountain | Summit | 2955 | Park | 45 04 49 N | 109 51 24 W |
| Middle Pasture Well | Well | 1006 | Powder River | 45 30 14 N | 106 04 15 W |
| Middle Peak | Summit | 2138 | Judith Basin | 47 23 55 N | 110 36 38 W |
| Middle Phillips Creek | Stream | | Garfield | 47 02 19 N | 106 38 17 W |
| Middle Pine Creek | Stream | | Big Horn | 45 08 14 N | 107 14 49 W |
| Middle Quartz Lake | Lake | 1341 | Flathead | 48 49 23 N | 114 08 29 W |
| Middle Reservoir | Reservoir | 814 | Valley | 48 27 48 N | 106 25 23 W |
| Middle Ridge | Ridge | 1706 | Big Horn | 45 13 06 N | 108 00 22 W |
| Middle Ridge | Ridge | 2984 | Park | 45 11 18 N | 110 20 09 W |
| Middle Rock Creek | Stream | | Mineral | 47 22 40 N | 115 17 48 W |
| Middle Slick Creek | Stream | | Carter | 45 39 56 N | 104 03 19 W |
| Middle Snowdrift Creek Mine | Mine | 2138 | Jefferson | 46 21 60 N | 112 12 25 W |
| Middle Supply Ditch | Canal | 1440 | Gallatin | 45 39 58 N | 111 11 06 W |
| Middle Thompson Lake | Lake | 1016 | Lincoln | 48 01 52 N | 115 04 27 W |
| Middle Willow Creek | Stream | | Cascade | 47 26 27 N | 110 49 49 W |
| Middle Windsor Ditch | Canal | 1331 | Park | 45 43 32 N | 110 23 30 W |
| Middle Zee Ski Trail | Trail | 1816 | Lewis and Clark | 46 45 12 N | 112 18 50 W |
| Middleman Mountain | Summit | 2289 | Lewis and Clark | 46 48 19 N | 111 40 58 W |
| Middleton School (historical) | School | 1098 | Teton | 47 50 33 N | 111 34 49 W |
| Midge Creek | Stream | | Lincoln | 48 56 05 N | 115 55 02 W |
| Midget Creek | Stream | | Flathead | 48 36 55 N | 113 52 24 W |
| Midland (historical) | Populated Place | 993 | Carter | 45 40 35 N | 104 03 27 W |
| Midland Post Office (historical) | Post Office | 993 | Carter | 45 40 35 N | 104 03 27 W |
| Midland School (historical) | School | 993 | Carter | 45 40 35 N | 104 03 27 W |
| Midnight Basin Ski Trail | Trail | 2365 | Madison | 45 16 51 N | 111 24 24 W |
| Midnight Canyon | Valley | | Stillwater | 45 29 08 N | 109 40 14 W |
| Midnight Creek | Stream | | Stillwater | 45 29 31 N | 109 39 56 W |
| Midnight Hill | Summit | 1847 | Lewis and Clark | 47 03 17 N | 112 22 06 W |
| Midnight Mine | Mine | 2142 | Beaverhead | 45 18 25 N | 112 53 12 W |
| Midvale Creek | Stream | | Glacier | 48 25 24 N | 113 10 37 W |
| Midvale Creek Bridge | Bridge | 1581 | Glacier | 48 22 33 N | 113 13 06 W |
| Midway | Populated Place | 609 | Richland | 47 30 54 N | 104 19 14 W |
| Midway (historical) | Locale | 2081 | Beaverhead | 44 57 42 N | 113 24 23 W |
| Midway (historical) | Populated Place | 1107 | Pondera | 48 05 60 N | 111 52 53 W |
| Midway (historical) | Populated Place | 620 | Valley | 48 01 30 N | 106 27 24 W |
| Midway (historical) | Populated Place | 814 | Valley | 48 33 10 N | 106 27 12 W |
| Midway Community Center | Locale | 720 | Richland | 47 48 06 N | 104 22 13 W |