Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Lower New Year Mine | Mine | 1617 | Fergus | 47 09 18 N | 109 19 08 W |
| Lower Newhouse Coulee | Valley | | Garfield | 47 10 13 N | 107 53 21 W |
| Lower Ninemile Mine | Mine | 1405 | Missoula | 47 12 53 N | 114 39 28 W |
| Lower Old Glory Mine | Mine | 1538 | Fergus | 47 14 07 N | 109 08 10 W |
| Lower Old Nelson Mine | Mine | 1558 | Fergus | 47 10 27 N | 109 13 04 W |
| Lower Ox Frame Gulch Mine | Mine | 1639 | Fergus | 47 08 42 N | 109 14 08 W |
| Lower Paradise School (historical) | School | 724 | Blaine | 48 31 60 N | 108 55 11 W |
| Lower Paradise Ski Trail | Trail | 1810 | Missoula | 47 01 25 N | 113 59 50 W |
| Lower Prosperity Mine | Mine | 1325 | Mineral | 47 16 52 N | 114 54 08 W |
| Lower Quartz Lake | Lake | 1279 | Flathead | 48 48 25 N | 114 10 25 W |
| Lower Raven Mine | Mine | 820 | Sanders | 47 36 60 N | 115 11 37 W |
| Lower Rebellion Mine | Mine | 2130 | Cascade | 46 56 60 N | 110 42 03 W |
| Lower Red Rock Lake | Lake | 2015 | Beaverhead | 44 38 12 N | 111 50 42 W |
| Lower Riddell Lake | Lake | 2170 | Lake | 47 16 21 N | 113 52 17 W |
| Lower River Ditch | Canal | 1527 | Beaverhead | 45 16 42 N | 112 33 42 W |
| Lower Rock Canyon Spring | Spring | 2357 | Beaverhead | 44 47 41 N | 112 54 09 W |
| Lower Royals Ski Trail | Trail | 2528 | Carbon | 45 11 15 N | 109 21 03 W |
| Lower Saint Mary Lake | Lake | 1364 | Glacier | 48 47 25 N | 113 25 16 W |
| Lower Schwark Mine | Mine | 889 | Sanders | 47 32 42 N | 115 31 24 W |
| Lower Second Thought Ski Trail | Trail | 1810 | Missoula | 47 01 25 N | 113 59 50 W |
| Lower Sevenmile Creek | Stream | | Dawson | 47 14 23 N | 104 38 09 W |
| Lower Sevenmile School (historical) | School | 728 | Dawson | 47 16 54 N | 104 46 38 W |
| Lower Seymour Lake | Lake | 2060 | Deer Lodge | 45 59 06 N | 113 11 07 W |
| Lower Seymour Laske Campground | Locale | 2222 | Deer Lodge | 45 59 17 N | 113 10 29 W |
| Lower Shields Valley Ditch | Canal | 1421 | Park | 45 49 03 N | 110 31 51 W |
| Lower Silver King Mine | Mine | 783 | Sanders | 47 36 50 N | 115 11 21 W |
| Lower Smith River Fishing Access Site | Locale | 1018 | Cascade | 47 23 38 N | 111 26 56 W |
| Lower Snow Creek Well | Well | 991 | Carter | 45 46 30 N | 104 13 23 W |
| Lower Spring | Spring | 1634 | Broadwater | 46 11 03 N | 111 45 23 W |
| Lower Stillwater Lake | Lake | 931 | Flathead | 48 31 29 N | 114 33 52 W |
| Lower Summit | Summit | 891 | McCone | 47 13 30 N | 105 31 23 W |
| Lower Sunrise Bowl Ski Trail | Trail | 1810 | Missoula | 47 01 25 N | 113 59 50 W |
| Lower Sweeney Mine | Mine | 2538 | Beaverhead | 44 43 54 N | 113 11 37 W |
| Lower Sweet Grass Canal | Canal | 1413 | Sweet Grass | 46 02 20 N | 109 50 60 W |
| Lower Taylor Reservoir | Reservoir | 1525 | Powell | 46 24 28 N | 112 49 36 W |
| Lower Thompson Lake | Lake | 1016 | Lincoln | 48 01 11 N | 115 01 60 W |
| Lower Threemile School (historical) | School | 805 | Dawson | 47 13 02 N | 104 47 21 W |
| Lower Twin Creek | Stream | | Flathead | 47 59 19 N | 113 34 02 W |
| Lower Twin Creek | Stream | | Lewis and Clark | 47 17 06 N | 112 40 41 W |
| Lower Twin Lake | Reservoir | 1995 | Ravalli | 46 09 12 N | 114 29 45 W |
| Lower Twin Lakes Dam | Dam | 1995 | Ravalli | 46 09 12 N | 114 29 45 W |
| Lower Two Calf Island | Island | 694 | Phillips | 47 38 45 N | 108 45 46 W |
| Lower Two Medicine Dam | Dam | 1490 | Glacier | 48 29 36 N | 113 16 03 W |
| Lower Two Medicine Lake | Lake | 1489 | Glacier | 48 29 32 N | 113 15 49 W |
| Lower Two Medicine Reservoir | Reservoir | 1490 | Glacier | 48 29 36 N | 113 16 03 W |
| Lower Warm Springs Campground | Locale | 1909 | Deer Lodge | 46 11 59 N | 113 10 03 W |
| Lower Weede School (historical) | School | 773 | Petroleum | 46 57 43 N | 107 55 07 W |
| Lower West Eureka Mine | Mine | 2026 | Cascade | 46 57 07 N | 110 42 51 W |
| Lower Whitetail Park | Flat | 1715 | Jefferson | 46 00 29 N | 112 13 19 W |
| Lower Wilbur Reservoir | Reservoir | 1124 | Powder River | 45 35 27 N | 105 57 55 W |
| Lower Wild Acres Ski Trail | Trail | 1816 | Lewis and Clark | 46 45 12 N | 112 18 50 W |
| Lower Willow Creek | Stream | | Granite | 46 36 51 N | 113 09 37 W |
| Lower Willow Creek Dam | Dam | 1415 | Granite | 46 33 42 N | 113 18 27 W |
| Lower Willow Creek Reservoir | Reservoir | 1441 | Granite | 46 33 34 N | 113 18 53 W |
| Lower Willow Creek Trail Number Four | Trail | 1966 | Granite | 46 28 53 N | 113 21 38 W |
| Lower Windsor Ditch | Canal | 1318 | Park | 45 42 51 N | 110 21 42 W |
| Lower Yellowstone Diversion Dam | Dam | 605 | Dawson | 47 16 50 N | 104 31 47 W |
| Lowery Gulch | Valley | | Lincoln | 48 22 12 N | 115 25 34 W |
| Loweth | Populated Place | 1768 | Meagher | 46 22 08 N | 110 42 28 W |
| Loweth (historical) | Locale | 1768 | Meagher | 46 22 08 N | 110 42 28 W |
| Loweth School (historical) | School | 1768 | Meagher | 46 22 08 N | 110 42 28 W |
| Lowland Campground | Locale | 2007 | Jefferson | 46 08 23 N | 112 30 16 W |
| Lowland Creek | Stream | | Jefferson | 46 14 44 N | 112 24 50 W |
| Lowland Creek Dam | Dam | 1943 | Jefferson | 46 09 18 N | 112 27 51 W |
| Lowline Canal | Canal | 1396 | Gallatin | 45 43 43 N | 111 21 08 W |
| Lowman Creek | Stream | | Ravalli | 45 58 03 N | 114 06 08 W |
| Lowrane (historical) | Populated Place | 792 | Phillips | 48 56 18 N | 107 49 20 W |
| Lowrane Post Office (historical) | Post Office | 792 | Phillips | 48 56 18 N | 107 49 20 W |
| Lowry | Populated Place | 1103 | Cascade | 47 30 45 N | 112 00 35 W |
| Lowry (historical) | Locale | 1111 | Cascade | 47 30 40 N | 112 00 43 W |
| Lowry Post Office (historical) | Post Office | 1105 | Teton | 47 31 13 N | 112 00 20 W |
| Loy School | School | 1053 | Cascade | 47 30 40 N | 111 12 51 W |
| Loyd Criswell School (historical) | School | 854 | Treasure | 46 11 28 N | 107 07 50 W |
| Loyd Uhl Ranch | Locale | 1363 | Park | 45 41 22 N | 110 32 04 W |
| Loyning School (historical) | School | 1394 | Carbon | 45 18 08 N | 109 06 24 W |
| Loyola - Sacred Heart High School | School | 977 | Missoula | 46 51 45 N | 114 00 08 W |
| Lozeau | Populated Place | 857 | Mineral | 47 06 60 N | 114 46 48 W |
| Lozeau Flats | Flat | 936 | Sanders | 47 52 29 N | 114 40 34 W |
| Lozeau Post Office (historical) | Post Office | 859 | Mineral | 47 07 03 N | 114 46 48 W |
| Lozo Creek | Stream | | Mineral | 47 08 26 N | 114 48 20 W |
| Lubbock-Wallace School (historical) | School | 930 | Treasure | 45 59 40 N | 107 08 12 W |
| Lubec Lake | Lake | 1535 | Glacier | 48 22 43 N | 113 16 45 W |
| Lubec Post Office (historical) | Post Office | 1562 | Glacier | 48 22 17 N | 113 16 43 W |
| Lubec Ridge | Ridge | 1669 | Glacier | 48 22 50 N | 113 13 06 W |
| Lubrecht Camp | Locale | 1251 | Missoula | 46 53 32 N | 113 26 59 W |
| Lubrecht Camp Ski Area | Locale | 1263 | Missoula | 46 53 44 N | 113 26 53 W |
| Lubrecht State Experimental Forest | Forest | 1267 | Missoula | 46 53 30 N | 113 26 03 W |
| Lucas Cabin | Locale | 1773 | Meagher | 46 17 21 N | 110 39 50 W |
| Lucas Number 1 Dam | Dam | 1662 | Meagher | 46 16 24 N | 110 41 57 W |
| Lucas Number 2 Dam | Dam | 1728 | Meagher | 46 13 30 N | 110 41 33 W |
| Lucas Number 3 Dam | Dam | 1724 | Meagher | 46 13 30 N | 110 41 15 W |
| Lucas Ranch | Locale | 1662 | Meagher | 46 16 24 N | 110 42 03 W |
| Lucas Reservoir | Reservoir | 1662 | Meagher | 46 16 24 N | 110 41 57 W |
| Luccock Park Assembly Grounds | Park | 1692 | Park | 45 29 57 N | 110 31 44 W |
| Lucerne (historical) | Locale | 1064 | Flathead | 48 09 48 N | 114 49 04 W |
| Lucerne Post Office (historical) | Post Office | 1060 | Liberty | 48 45 45 N | 110 55 15 W |
| Lucerne School (historical) | School | 1060 | Liberty | 48 45 45 N | 110 55 15 W |
| Lucier Ranch Landing Strip | Airport | 1348 | Fergus | 47 10 36 N | 109 18 27 W |
| Lucier School (historical) | School | 1307 | Fergus | 47 09 26 N | 109 23 12 W |
| Lucifer Lake | Lake | 1911 | Lake | 47 20 31 N | 113 55 13 W |
| Lucille (historical) | Locale | 986 | Chouteau | 48 06 13 N | 111 17 18 W |
| Lucille Post Office (historical) | Post Office | 986 | Chouteau | 48 06 13 N | 111 17 18 W |
| Luck Heat Mine | Mine | 1757 | Jefferson | 45 54 55 N | 112 01 58 W |
| Luckey Homestead | Locale | 1210 | Stillwater | 45 46 59 N | 108 56 29 W |
| Luckinbill Airstrip | Airport | 2012 | Park | 44 50 17 N | 109 37 20 W |
| Lucky 7 Mine | Mine | 1176 | Mineral | 47 02 10 N | 114 50 26 W |
| Lucky Blue Mine | Mine | 2041 | Deer Lodge | 46 11 18 N | 113 09 16 W |
| Lucky Boy Gulch | Valley | | Sanders | 47 32 31 N | 115 33 11 W |
| Lucky Boy Mine | Mine | 1719 | Meagher | 46 38 22 N | 110 26 08 W |
| Lucky Creek School (historical) | School | 811 | Wibaux | 47 10 28 N | 104 05 32 W |