Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| South Fork Sheep Creek | Stream | | Park | 45 12 35 N | 110 15 24 W |
| South Fork Shields River | Stream | | Park | 46 10 04 N | 110 28 47 W |
| South Fork Shorty Creek | Stream | | Flathead | 48 49 06 N | 114 36 50 W |
| South Fork Simms Creek | Stream | | Lewis and Clark | 47 28 12 N | 112 01 24 W |
| South Fork Sixteenmile Creek | Stream | | Gallatin | 46 07 27 N | 111 05 49 W |
| South Fork Sleeman Creek | Stream | | Missoula | 46 46 13 N | 114 08 07 W |
| South Fork Sleeping Child Creek | Stream | | Ravalli | 46 02 03 N | 113 51 26 W |
| South Fork Slim Sam Creek | Stream | | Broadwater | 46 14 46 N | 111 42 04 W |
| South Fork Smith River | Stream | | Meagher | 46 31 43 N | 110 58 41 W |
| South Fork Snow Creek | Stream | | Garfield | 47 34 16 N | 107 11 19 W |
| South Fork Sorrel Horse Creek | Stream | | Big Horn | 45 59 55 N | 107 35 41 W |
| South Fork South Fork Teton River | Stream | | Teton | 47 51 02 N | 112 46 41 W |
| South Fork Spade Creek | Stream | | Ravalli | 45 54 32 N | 114 06 47 W |
| South Fork Spanish Creek | Stream | | Gallatin | 45 29 53 N | 111 19 20 W |
| South Fork Spotted Dog Creek | Stream | | Powell | 46 30 57 N | 112 34 27 W |
| South Fork Spring Coulee | Valley | | Hill | 48 24 31 N | 109 49 41 W |
| South Fork Spring Creek | Stream | | Big Horn | 45 05 12 N | 106 50 27 W |
| South Fork Spring Creek | Stream | | Granite | 46 20 39 N | 113 29 55 W |
| South Fork Squaw Creek | Stream | | Big Horn | 45 33 11 N | 107 30 55 W |
| South Fork Squaw Creek | Stream | | Madison | 44 55 04 N | 111 34 03 W |
| South Fork Standard Creek | Stream | | Madison | 44 54 16 N | 111 47 21 W |
| South Fork State Creek | Stream | | Jefferson | 46 06 24 N | 112 09 15 W |
| South Fork Steel Creek | Stream | | Beaverhead | 45 36 04 N | 113 21 50 W |
| South Fork Stickney Creek | Stream | | Lewis and Clark | 47 05 18 N | 111 55 31 W |
| South Fork Sullivan Creek | Stream | | Lincoln | 48 52 37 N | 115 20 02 W |
| South Fork Sun River | Stream | | Lewis and Clark | 47 37 47 N | 112 51 25 W |
| South Fork Swamp Creek | Stream | | Sweet Grass | 45 57 32 N | 110 09 48 W |
| South Fork Swan Creek | Stream | | Gallatin | 45 22 37 N | 111 05 22 W |
| South Fork Sweeney Creek | Stream | | Ravalli | 46 37 16 N | 114 11 42 W |
| South Fork Sweet Grass Creek | Stream | | Park | 46 05 53 N | 110 20 05 W |
| South Fork Tamarack Creek | Stream | | Mineral | 47 22 45 N | 115 05 40 W |
| South Fork Taylor Canyon | Valley | | Madison | 45 17 32 N | 112 09 43 W |
| South Fork Taylor Creek | Stream | | Powder River | 45 15 54 N | 106 06 00 W |
| South Fork Tenderfoot Creek | Stream | | Meagher | 46 56 60 N | 111 09 03 W |
| South Fork Tenmile Creek | Stream | | Sweet Grass | 45 57 48 N | 109 56 19 W |
| South Fork Teton River | Stream | | Teton | 47 52 58 N | 112 38 00 W |
| South Fork Teton Trailhead | Locale | 1773 | Teton | 47 50 51 N | 112 46 58 W |
| South Fork Teton-Blacktail National Recreation Trail | Trail | 1879 | Teton | 47 43 46 N | 112 45 21 W |
| South Fork Thief Creek | Stream | | Beaverhead | 45 25 12 N | 112 52 33 W |
| South Fork Thirteenmile Creek | Stream | | Dawson | 47 21 35 N | 104 39 56 W |
| South Fork Three Bar Creek | Stream | | Powder River | 45 01 57 N | 105 40 16 W |
| South Fork Three Bar Creek | Stream | 1109 | Powder River | 45 01 57 N | 105 40 15 W |
| South Fork Threemile Creek | Stream | | Powder River | 45 30 01 N | 106 02 17 W |
| South Fork Tie Creek | Stream | | Beaverhead | 45 41 48 N | 113 41 24 W |
| South Fork Timber Creek | Stream | | Prairie | 47 02 47 N | 105 58 16 W |
| South Fork Trail | Trail | 1668 | Gallatin | 46 02 26 N | 110 59 33 W |
| South Fork Trail Creek | Stream | | Carbon | 45 05 51 N | 108 13 06 W |
| South Fork Trail Creek | Stream | | Flathead | 48 00 01 N | 112 59 54 W |
| South Fork Traux Coulee | Valley | | Valley | 48 17 20 N | 106 59 57 W |
| South Fork Trout Creek | Stream | | Mineral | 47 00 12 N | 114 59 33 W |
| South Fork Tucker Creek | Stream | | Silver Bow | 45 48 01 N | 112 40 40 W |
| South Fork Tusler Creek | Stream | | McCone | 47 12 56 N | 105 33 39 W |
| South Fork Two Calf Creek | Stream | | Fergus | 47 38 21 N | 108 53 17 W |
| South Fork Two Leggins Creek | Stream | | Big Horn | 45 38 37 N | 107 45 18 W |
| South Fork Two Medicine River | Stream | | Glacier | 48 24 38 N | 113 03 30 W |
| South Fork Valentine Creek | Stream | | Glacier | 48 54 04 N | 113 57 49 W |
| South Fork Valley Creek | Stream | | Stillwater | 45 43 14 N | 109 00 23 W |
| South Fork Warm Springs Creek | Stream | | Jefferson | 46 25 17 N | 111 56 53 W |
| South Fork Warm Springs Creek | Stream | | Madison | 45 02 21 N | 111 56 07 W |
| South Fork Watson Creek | Stream | | Beaverhead | 45 03 46 N | 113 10 16 W |
| South Fork Wayne Creek | Stream | | Blaine | 48 38 20 N | 108 43 48 W |
| South Fork West Fork Blacktail Deer Creek | Stream | | Beaverhead | 44 46 12 N | 112 15 27 W |
| South Fork West Fork Gallatin River | Stream | | Gallatin | 45 16 05 N | 111 16 22 W |
| South Fork West Soap Creek | Stream | | Big Horn | 45 15 15 N | 107 47 56 W |
| South Fork Whetstone Creek | Stream | | Meagher | 46 31 36 N | 110 28 19 W |
| South Fork White Creek | Stream | | Mineral | 46 47 49 N | 114 39 33 W |
| South Fork White River | Stream | | Powell | 47 35 00 N | 113 11 57 W |
| South Fork Whitetail Creek | Stream | | Carter | 45 24 39 N | 104 42 22 W |
| South Fork Whitetail Creek | Stream | | Daniels | 48 53 07 N | 105 06 21 W |
| South Fork Whitetail Creek | Stream | | Pondera | 48 17 56 N | 112 49 27 W |
| South Fork Wilkes Creek | Stream | | Sanders | 47 30 50 N | 115 27 16 W |
| South Fork Willoughby Creek | Stream | | Ravalli | 46 27 23 N | 114 00 00 W |
| South Fork Willow Creek | Stream | | Carter | 45 05 32 N | 104 42 15 W |
| South Fork Willow Creek | Stream | | Meagher | 46 31 46 N | 110 48 53 W |
| South Fork Willow Creek | Stream | | Park | 45 46 32 N | 110 38 47 W |
| South Fork Willow Creek | Stream | | Teton | 47 48 42 N | 112 28 59 W |
| South Fork Willow Creek | Stream | | Valley | 47 53 18 N | 107 13 58 W |
| South Fork Woods Creek | Stream | | Ravalli | 45 32 31 N | 114 24 05 W |
| South Fork Woods Gulch Creek | Stream | | Meagher | 46 30 38 N | 111 02 21 W |
| South Fork Woody Creek | Stream | | Garfield | 47 32 40 N | 106 38 46 W |
| South Fork Wounded Man Creek | Stream | | Sweet Grass | 45 13 31 N | 110 01 21 W |
| South Fork Wright Creek | Stream | | Powder River | 45 07 48 N | 105 16 17 W |
| South Fork Yaak River | Stream | | Lincoln | 48 50 02 N | 115 41 31 W |
| South Fork Young Creek | Stream | | Lincoln | 48 58 20 N | 115 19 58 W |
| South Foster Coulee | Valley | | McCone | 47 33 09 N | 106 12 20 W |
| South Franklin Hill Mine | Mine | 1899 | Granite | 46 18 57 N | 113 15 53 W |
| South Frying Pan Creek | Stream | | Beaverhead | 44 56 48 N | 113 26 09 W |
| South Frying Pan Creek Mine | Mine | 2651 | Beaverhead | 45 56 15 N | 113 21 59 W |
| South Fuhrman School (historical) | School | 880 | Valley | 48 35 54 N | 106 22 37 W |
| South Gap Creek | Stream | | Chouteau | 47 29 55 N | 110 42 60 W |
| South Gash Creek | Stream | | Ravalli | 46 24 01 N | 114 14 30 W |
| South Getaway Coulee | Valley | | Garfield | 47 37 43 N | 106 58 51 W |
| South Gold Creek | Stream | | Granite | 46 28 04 N | 113 02 59 W |
| South Great Falls (historical) | Locale | 1011 | Cascade | 47 28 15 N | 111 18 53 W |
| South Harb School (historical) | School | 758 | Phillips | 48 10 03 N | 107 26 13 W |
| South Harkins Well | Well | 1029 | Carter | 45 45 15 N | 104 41 40 W |
| South Hills | Range | 1095 | Missoula | 46 49 30 N | 114 00 53 W |
| South Hills Fishing Access Site | Locale | 954 | Yellowstone | 45 44 38 N | 108 30 20 W |
| South Indian Creek | Stream | | Carter | 44 54 09 N | 103 48 18 W |
| South Jefferson Creek | Stream | | Teton | 47 48 24 N | 112 35 16 W |
| South Kalispell Fire Department | Building | 891 | Flathead | 48 10 18 N | 114 17 14 W |
| South Kirby Coulee | Valley | | Garfield | 47 16 29 N | 107 46 06 W |
| South Kootenai Lake | Lake | 1908 | Ravalli | 46 32 20 N | 114 19 13 W |
| South Lamoose Creek | Stream | | Lake | 47 13 55 N | 114 04 56 W |
| South Laney Creek | Stream | | Custer | 46 20 02 N | 105 18 16 W |
| South Liberty School (historical) | School | 1139 | Teton | 47 54 45 N | 111 59 43 W |
| South Lion Lake Campground | Locale | 1089 | Flathead | 48 22 04 N | 114 01 48 W |
| South Lost Horse Creek | Stream | | Ravalli | 46 06 19 N | 114 16 41 W |
| South Madison Campground | Locale | 1723 | Madison | 44 59 47 N | 111 39 33 W |
| South McCauley Ditch | Canal | 1592 | Silver Bow | 45 39 01 N | 112 40 26 W |