Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Stephensons Trailer Court | Populated Place | 740 | McCone | 47 25 09 N | 105 35 34 W |
| Stepping Stone Lake | Lake | 3135 | Park | 45 06 37 N | 109 48 36 W |
| Sterling | Populated Place | 1527 | Madison | 45 33 55 N | 111 45 34 W |
| Sterling (historical) | Locale | 853 | Lincoln | 48 15 46 N | 115 10 26 W |
| Sterling Creek | Stream | | Lincoln | 48 35 47 N | 115 04 03 W |
| Sterling Ditch | Canal | 1526 | Gallatin | 45 33 42 N | 111 13 43 W |
| Sterling Gulch | Valley | | Lincoln | 48 15 03 N | 115 15 08 W |
| Sterling Mine | Mine | 1142 | Powder River | 45 22 59 N | 105 55 04 W |
| Sterling Post Office (historical) | Post Office | 1527 | Madison | 45 33 55 N | 111 45 34 W |
| Sterling Price Mine | Mine | 1488 | Jefferson | 46 30 45 N | 112 00 38 W |
| Sterling School (historical) | School | 1527 | Madison | 45 33 55 N | 111 45 34 W |
| Sterret Dam | Dam | 1633 | Meagher | 46 24 12 N | 110 58 21 W |
| Stetler Lakes | Lake | 1092 | Pondera | 48 25 45 N | 112 12 37 W |
| Stetler Ranch | Locale | 1490 | Teton | 47 44 24 N | 112 34 34 W |
| Steve Forks | Populated Place | 873 | Garfield | 47 16 15 N | 107 20 02 W |
| Steve Forks | Stream | | Garfield | 47 16 10 N | 107 08 41 W |
| Steve Forks Cemetery | Cemetery | 890 | Garfield | 47 15 46 N | 107 19 58 W |
| Steve McClain Memorial Park | Park | 897 | Fallon | 46 22 02 N | 104 16 56 W |
| Stevens Butte | Summit | 1993 | Judith Basin | 46 43 16 N | 109 53 15 W |
| Stevens Coulee | Valley | | Valley | 48 31 42 N | 107 12 10 W |
| Stevens Coulee Number 1 Dam | Dam | 760 | Garfield | 47 15 30 N | 106 16 20 W |
| Stevens Creek | Stream | | Lake | 47 09 55 N | 114 00 50 W |
| Stevens Creek | Stream | | Sanders | 47 56 31 N | 115 44 04 W |
| Stevens Creek Trail | Trail | 1267 | Sanders | 47 55 40 N | 115 47 53 W |
| Stevens Ditch | Canal | 1284 | Big Horn | 45 02 03 N | 107 25 41 W |
| Stevens Draw | Valley | | Carbon | 45 11 35 N | 108 27 39 W |
| Stevens Gulch | Valley | | Ravalli | 45 37 31 N | 114 17 42 W |
| Stevens Gulch | Valley | | Wheatland | 46 40 25 N | 109 45 12 W |
| Stevens Number 1 Dam | Dam | 1176 | Rosebud | 45 12 42 N | 106 19 26 W |
| Stevens Number 1 Dam | Dam | 1732 | Sweet Grass | 46 02 42 N | 110 04 57 W |
| Stevens Peak | Summit | 1712 | Sanders | 47 55 04 N | 115 46 30 W |
| Stevens Point School (historical) | School | 656 | Valley | 48 04 52 N | 106 24 12 W |
| Stevens Ridge Trail | Trail | 1523 | Sanders | 47 55 22 N | 115 51 02 W |
| Stevens Slough | Stream | | Madison | 45 25 54 N | 112 34 30 W |
| Stevenson Creek | Stream | | Beaverhead | 45 39 02 N | 113 47 03 W |
| Stevenson Ditch | Canal | 1287 | Broadwater | 46 11 60 N | 111 35 28 W |
| Stevenson Park | Park | 1241 | Gallatin | 45 53 23 N | 111 32 56 W |
| Stevenson Ranch | Locale | 910 | Chouteau | 47 47 54 N | 110 35 38 W |
| Stevensville | Locale | 1027 | Ravalli | 46 30 27 N | 114 04 58 W |
| Stevensville | Populated Place | 1013 | Ravalli | 46 30 36 N | 114 05 35 W |
| Stevensville Airport | Airport | 1092 | Ravalli | 46 31 29 N | 114 03 06 W |
| Stevensville Fire Department | Building | 1012 | Ravalli | 46 30 38 N | 114 05 36 W |
| Stevensville Medical Clinic | Hospital | 1013 | Ravalli | 46 30 30 N | 114 05 39 W |
| Stevensville Museum | Building | 1007 | Ravalli | 46 31 10 N | 114 05 35 W |
| Stevensville Police Department | Building | 1012 | Ravalli | 46 30 38 N | 114 05 36 W |
| Stevensville Post Office | Post Office | 1013 | Ravalli | 46 30 38 N | 114 05 33 W |
| Stevensville Public Schools | School | 1026 | Ravalli | 46 30 25 N | 114 05 05 W |
| Stevensville Reservoir | Reservoir | 1084 | Ravalli | 46 30 03 N | 114 02 44 W |
| Stevensville Seventh Day Adventist Church | Church | 1028 | Ravalli | 46 29 14 N | 114 05 03 W |
| Stevensville Sewage Lagoon Dam | Dam | 1001 | Ravalli | 46 30 42 N | 114 06 09 W |
| Stevensville United Methodist Church | Church | 1016 | Ravalli | 46 30 36 N | 114 05 24 W |
| Stevensvillers Ranger Station | Locale | 1012 | Ravalli | 46 30 47 N | 114 05 32 W |
| Steves Coulee | Valley | | Garfield | 47 15 14 N | 106 17 03 W |
| Steves Fork School (historical) | School | 906 | Garfield | 47 16 45 N | 107 21 54 W |
| Steves Pass | Gap | 1472 | Missoula | 46 54 47 N | 113 37 08 W |
| Stevesfork Post Office (historical) | Post Office | 906 | Garfield | 47 16 45 N | 107 21 54 W |
| Stevie Creek | Stream | | Big Horn | 45 08 12 N | 107 35 32 W |
| Steward Mine | Mine | 1788 | Silver Bow | 46 01 06 N | 112 32 07 W |
| Stewart Coulee | Valley | | Liberty | 48 24 59 N | 111 04 37 W |
| Stewart Creek | Stream | | Deer Lodge | 45 51 03 N | 113 15 08 W |
| Stewart Creek | Stream | | Lincoln | 48 37 52 N | 114 55 14 W |
| Stewart Creek | Stream | | Valley | 48 57 20 N | 106 17 02 W |
| Stewart Dam | Dam | 946 | Chouteau | 48 06 36 N | 111 00 33 W |
| Stewart Gulch | Valley | | Granite | 46 21 34 N | 113 16 46 W |
| Stewart Homes Park | Park | 1222 | Lewis and Clark | 46 35 38 N | 112 01 03 W |
| Stewart Lake | Lake | 2288 | Beaverhead | 45 31 15 N | 113 16 25 W |
| Stewart Lake | Lake | 2043 | Granite | 46 21 52 N | 113 14 05 W |
| Stewart Meadows | Swamp | 2293 | Beaverhead | 45 31 44 N | 113 16 30 W |
| Stewart Mountain | Summit | 2469 | Beaverhead | 45 30 32 N | 113 16 41 W |
| Stewart Ranch | Locale | 943 | Chouteau | 48 06 49 N | 111 00 40 W |
| Stewart Ranch | Locale | 999 | Yellowstone | 45 47 04 N | 108 37 33 W |
| Stewart Reservoir | Reservoir | 1126 | Powder River | 45 13 37 N | 106 02 31 W |
| Stewart Reservoir Number Two | Reservoir | 1121 | Powder River | 45 15 46 N | 106 02 43 W |
| Stewart School (historical) | School | 1430 | Carbon | 45 21 05 N | 109 23 03 W |
| Stewarts RV Park | Locale | 1185 | Lewis and Clark | 46 35 23 N | 111 54 56 W |
| Stick Gulch | Valley | | Sanders | 47 36 39 N | 115 33 47 W |
| Stick-in-the Mud Dam | Dam | 1628 | Stillwater | 45 21 18 N | 109 34 21 W |
| Sticking There Dam | Dam | 1040 | Big Horn | 45 35 60 N | 107 11 02 W |
| Stickney Creek | Stream | | Lewis and Clark | 47 06 37 N | 111 56 55 W |
| Stickney Creek Fishing Access Site | Locale | 1051 | Lewis and Clark | 47 06 30 N | 111 56 49 W |
| Stieg Well | Well | 1063 | Carter | 45 44 18 N | 104 11 06 W |
| Stiffarm Coulee | Valley | | Blaine | 48 07 01 N | 108 39 46 W |
| Stiles Number 1 Dam | Dam | 717 | Custer | 46 32 00 N | 105 44 50 W |
| Still Creek | Stream | | Lincoln | 48 44 41 N | 115 04 35 W |
| Still Creek | Stream | | Madison | 45 03 27 N | 111 56 08 W |
| Still Gulch | Valley | | Beaverhead | 45 52 40 N | 113 06 50 W |
| Stillwater Ballfield Complex | Park | 960 | Rosebud | 45 54 35 N | 106 38 12 W |
| Stillwater Bible Church | Church | 1095 | Stillwater | 45 38 16 N | 109 15 21 W |
| Stillwater Church | Church | 935 | Flathead | 48 17 02 N | 114 23 43 W |
| Stillwater Community Hospital | Hospital | 1102 | Stillwater | 45 38 35 N | 109 15 33 W |
| Stillwater Community Hospital Extended Care Unit | Hospital | 1102 | Stillwater | 45 38 35 N | 109 15 33 W |
| Stillwater Convalescent Center | Hospital | 1094 | Stillwater | 45 38 15 N | 109 15 22 W |
| Stillwater County | Civil | 1241 | Stillwater | 45 40 00 N | 109 18 03 W |
| Stillwater County Courthouse | Building | 1099 | Stillwater | 45 38 28 N | 109 15 13 W |
| Stillwater County Fairgrounds | Locale | 1098 | Stillwater | 45 38 30 N | 109 15 07 W |
| Stillwater County Library | Building | 1098 | Stillwater | 45 38 25 N | 109 15 09 W |
| Stillwater County Sheriff Department | Building | 1099 | Stillwater | 45 38 28 N | 109 15 13 W |
| Stillwater Ditch | Canal | 1347 | Stillwater | 45 31 56 N | 109 36 19 W |
| Stillwater Golf Course | Locale | 1087 | Stillwater | 45 37 48 N | 109 14 13 W |
| Stillwater Grange | Locale | 932 | Flathead | 48 14 25 N | 114 22 44 W |
| Stillwater Park | Park | 989 | Rosebud | 45 54 34 N | 106 37 25 W |
| Stillwater Plateau | Plain | 3244 | Stillwater | 45 19 13 N | 109 50 14 W |
| Stillwater Post Office (historical) | Post Office | 1208 | Stillwater | 45 54 60 N | 109 05 12 W |
| Stillwater Ranger Station | Locale | 964 | Flathead | 48 32 33 N | 114 34 04 W |
| Stillwater River | Stream | | Flathead | 48 09 54 N | 114 15 39 W |
| Stillwater River | Stream | | Stillwater | 45 38 17 N | 109 16 56 W |
| Stillwater River Bridge | Bridge | 1464 | Stillwater | 45 25 55 N | 109 48 05 W |
| Stillwater Slough | Stream | | Flathead | 48 11 18 N | 114 17 46 W |
| Stillwater State Forest | Forest | 1385 | Flathead | 48 40 16 N | 114 34 57 W |
| Stillwater State Game Perserve | Park | 888 | Flathead | 48 13 37 N | 114 16 06 W |