Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| South Fork Jocko River | Stream | | Missoula | 47 11 42 N | 113 51 10 W |
| South Fork Jones Creek | Stream | | Custer | 46 25 50 N | 105 38 32 W |
| South Fork Judith River | Stream | | Judith Basin | 46 50 57 N | 110 16 10 W |
| South Fork Kate Creek | Stream | | Beaverhead | 44 45 54 N | 112 57 43 W |
| South Fork Keeler Creek | Stream | | Lincoln | 48 19 59 N | 115 55 07 W |
| South Fork Klingensmith Coulee | Valley | | Teton | 47 50 06 N | 112 18 00 W |
| South Fork Lake | Lake | 2068 | Ravalli | 46 26 59 N | 114 22 12 W |
| South Fork Lakes | Lake | 2034 | Jefferson | 46 16 49 N | 111 49 37 W |
| South Fork Lakes | Lake | 2192 | Ravalli | 46 34 60 N | 114 19 42 W |
| South Fork Lame Deer Creek | Stream | | Rosebud | 45 34 23 N | 106 37 03 W |
| South Fork Lay Creek | Stream | | Rosebud | 45 43 11 N | 106 20 54 W |
| South Fork Leaf Rock Creek | Stream | | Big Horn | 45 10 02 N | 106 51 08 W |
| South Fork Lee Creek | Stream | | Rosebud | 45 13 48 N | 106 23 26 W |
| South Fork Lena Creek | Stream | | Park | 46 06 21 N | 110 32 54 W |
| South Fork Lick Creek | Stream | | Lewis and Clark | 47 50 54 N | 113 00 09 W |
| South Fork Lion Creek | Stream | | Lake | 47 40 38 N | 113 38 46 W |
| South Fork Lisk Creek | Stream | | Richland | 47 47 31 N | 105 12 04 W |
| South Fork Little Badger Creek | Stream | | Glacier | 48 20 53 N | 113 02 10 W |
| South Fork Little Beaver Creek | Stream | | Valley | 48 05 33 N | 107 02 05 W |
| South Fork Little Belt Creek | Stream | | Cascade | 47 24 18 N | 110 40 16 W |
| South Fork Little Joe Creek | Stream | | Mineral | 47 16 11 N | 115 08 28 W |
| South Fork Little Peoples Creek | Stream | | Blaine | 47 57 50 N | 108 39 11 W |
| South Fork Little Prickly Pear Creek | Stream | | Lewis and Clark | 46 47 16 N | 112 26 13 W |
| South Fork Little Rock Coulee | Valley | | Glacier | 48 43 14 N | 112 27 11 W |
| South Fork Little Sleeping Child Creek | Stream | | Ravalli | 46 04 31 N | 114 04 20 W |
| South Fork Lodgepole Creek | Stream | | Garfield | 47 17 08 N | 107 51 50 W |
| South Fork Logan Creek | Stream | | Flathead | 48 08 09 N | 113 42 41 W |
| South Fork Lolo Creek | Stream | | Missoula | 46 45 44 N | 114 15 54 W |
| South Fork Lone Tree Creek | Stream | | Richland | 47 44 52 N | 104 21 05 W |
| South Fork Lone Tree Creek | Stream | | Valley | 47 58 46 N | 107 07 09 W |
| South Fork Lost Creek | Stream | | Lake | 47 52 23 N | 113 49 34 W |
| South Fork Lost Fork Judith River | Stream | | Judith Basin | 46 45 60 N | 110 29 38 W |
| South Fork Lower Willow Creek | Stream | | Granite | 46 33 35 N | 113 19 06 W |
| South Fork Lyons Creek | Stream | | Lewis and Clark | 46 58 16 N | 112 12 18 W |
| South Fork Madison River | Stream | | Gallatin | 44 44 33 N | 111 13 57 W |
| South Fork Maiden Creek | Stream | | Beaverhead | 44 51 09 N | 113 12 17 W |
| South Fork Marsh Coulee | Valley | | Treasure | 46 04 59 N | 107 25 31 W |
| South Fork Marten Creek | Stream | | Sanders | 47 52 36 N | 115 45 38 W |
| South Fork McDonald Creek | Stream | | Fergus | 47 02 54 N | 108 48 27 W |
| South Fork McDonald Creek | Stream | | Park | 45 27 13 N | 110 34 42 W |
| South Fork Meadow Creek | Stream | | Lincoln | 48 47 05 N | 115 56 19 W |
| South Fork Meadows | Flat | 1780 | Ravalli | 46 06 20 N | 114 25 32 W |
| South Fork Meyers Creek | Stream | | Sweet Grass | 45 29 11 N | 109 58 42 W |
| South Fork Milk Creek | Stream | | Fallon | 46 09 51 N | 104 39 13 W |
| South Fork Milk River | Stream | | Glacier | 48 51 20 N | 113 01 10 W |
| South Fork Mill Creek | Stream | | Madison | 45 29 16 N | 112 00 18 W |
| South Fork Mill Creek Mine | Mine | 2671 | Madison | 45 29 10 N | 111 58 08 W |
| South Fork Miller Creek | Stream | | Lincoln | 48 04 59 N | 115 28 14 W |
| South Fork Mission Creek | Stream | | Big Horn | 46 01 23 N | 107 33 54 W |
| South Fork Mission Creek | Stream | | Lake | 47 20 03 N | 113 56 47 W |
| South Fork Missouri Ditch | Canal | 1514 | Madison | 45 44 56 N | 111 53 01 W |
| South Fork Montgomery Gulch | Valley | | Granite | 46 17 44 N | 113 32 05 W |
| South Fork Monument Creek | Stream | | Big Horn | 45 07 37 N | 106 47 44 W |
| South Fork Muddy Creek | Stream | | Gallatin | 46 01 57 N | 110 48 23 W |
| South Fork Musselshell River | Stream | | Meagher | 46 28 46 N | 110 16 21 W |
| South Fork Nelson Creek | Stream | | McCone | 47 26 38 N | 106 01 17 W |
| South Fork Nemote Creek | Stream | | Mineral | 47 03 01 N | 114 41 45 W |
| South Fork North Fork Divide Creek | Stream | | Silver Bow | 45 52 27 N | 112 43 30 W |
| South Fork North Prong Indian Creek | Stream | | Powder River | 45 11 31 N | 106 00 40 W |
| South Fork of Cut Bank Creek Bridge | Bridge | 1532 | Glacier | 48 33 25 N | 113 16 13 W |
| South Fork of the Milk River Bridge | Bridge | 1537 | Glacier | 48 32 60 N | 113 16 18 W |
| South Fork Open Creek | Stream | | Lewis and Clark | 47 54 46 N | 112 59 53 W |
| South Fork Parmenter Creek | Stream | | Lincoln | 48 22 10 N | 115 42 30 W |
| South Fork Pass Creek | Stream | | Garfield | 47 34 07 N | 106 37 33 W |
| South Fork Pauline Creek | Stream | | Sanders | 47 20 21 N | 114 14 18 W |
| South Fork Peoples Creek | Stream | | Blaine | 48 15 23 N | 108 30 28 W |
| South Fork Petty Creek | Stream | | Missoula | 46 50 60 N | 114 26 16 W |
| South Fork Pilgrim Creek | Stream | | Sanders | 47 57 49 N | 115 51 47 W |
| South Fork Pine Creek | Stream | | Park | 45 29 16 N | 110 30 07 W |
| South Fork Pocket Creek | Stream | | Big Horn | 45 58 01 N | 107 29 00 W |
| South Fork Poker Jim Creek | Stream | | Rosebud | 45 22 37 N | 106 24 54 W |
| South Fork Pole Creek | Stream | | Beaverhead | 44 46 04 N | 112 03 15 W |
| South Fork Pole Creek | Stream | | Golden Valley | 46 44 03 N | 109 03 02 W |
| South Fork Poorman Creek | Stream | | Lewis and Clark | 46 52 30 N | 112 32 21 W |
| South Fork Quartz Creek | Stream | | Jefferson | 46 24 34 N | 112 08 46 W |
| South Fork Queen Gulch | Valley | | Jefferson | 46 15 10 N | 111 57 20 W |
| South Fork Railroad Creek | Stream | | Yellowstone | 46 10 17 N | 108 08 04 W |
| South Fork Red Meadow Creek | Stream | | Flathead | 48 48 19 N | 114 20 36 W |
| South Fork Red Rock Creek | Stream | | Jefferson | 46 18 29 N | 112 21 49 W |
| South Fork Red Shale Creek | Stream | | Lewis and Clark | 47 47 38 N | 112 59 35 W |
| South Fork Reno Creek | Stream | | Big Horn | 45 29 10 N | 107 17 27 W |
| South Fork Reservoir | Reservoir | 838 | Prairie | 46 52 57 N | 105 40 16 W |
| South Fork Reservoir | Reservoir | 1888 | Silver Bow | 45 51 26 N | 112 44 55 W |
| South Fork Reservoir Dam | Dam | 1943 | Silver Bow | 45 51 18 N | 112 44 57 W |
| South Fork Rickard Coulee | Valley | | Judith Basin | 46 52 51 N | 110 23 58 W |
| South Fork River Access | Locale | 1123 | Flathead | 47 55 54 N | 113 32 12 W |
| South Fork Roberts Gulch Mine | Mine | 2002 | Beaverhead | 45 00 15 N | 113 19 15 W |
| South Fork Rock Creek | Stream | | Granite | 46 06 47 N | 113 39 37 W |
| South Fork Rock Creek | Stream | | McCone | 47 42 48 N | 106 13 43 W |
| South Fork Rock Creek | Stream | | Powell | 46 23 41 N | 112 59 42 W |
| South Fork Rock Springs Creek | Stream | | Powder River | 45 22 50 N | 105 39 13 W |
| South Fork Romy Creek | Stream | | Madison | 45 00 12 N | 111 59 18 W |
| South Fork Rosebud Creek | Stream | | Big Horn | 45 12 48 N | 107 00 07 W |
| South Fork Ross Creek | Stream | | Gallatin | 45 49 12 N | 111 07 33 W |
| South Fork Ross Creek | Stream | | Lincoln | 48 11 32 N | 115 57 23 W |
| South Fork Ross Creek Trail | Trail | 952 | Lincoln | 48 11 43 N | 115 57 04 W |
| South Fork Ruby Creek | Stream | | Madison | 45 02 40 N | 111 44 54 W |
| South Fork Rumble Creek | Stream | | Missoula | 47 30 50 N | 113 38 40 W |
| South Fork Running Wolf Creek | Stream | | Judith Basin | 46 59 42 N | 110 23 27 W |
| South Fork Sage Creek | Stream | | Madison | 45 09 22 N | 112 12 11 W |
| South Fork Sand Arroyo | Valley | | McCone | 47 48 01 N | 106 14 35 W |
| South Fork Sandstone Creek | Stream | | Fallon | 46 24 24 N | 104 31 44 W |
| South Fork School (historical) | School | 1298 | Lewis and Clark | 47 10 14 N | 112 14 37 W |
| South Fork School (historical) | School | 898 | Prairie | 46 54 43 N | 105 45 07 W |
| South Fork School (historical) | School | 853 | Valley | 48 21 47 N | 105 58 37 W |
| South Fork Second Creek | Stream | | Custer | 46 09 32 N | 105 27 46 W |
| South Fork Shade Creek | Stream | | McCone | 47 49 27 N | 105 53 17 W |
| South Fork Sheep Coulee | Valley | | Phillips | 47 57 24 N | 107 43 04 W |
| South Fork Sheep Creek | Stream | | Cascade | 47 09 37 N | 111 47 31 W |
| South Fork Sheep Creek | Stream | | Custer | 46 14 53 N | 105 04 34 W |