Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Whitetail Saddle | Gap | 1603 | Granite | 46 40 10 N | 113 33 28 W |
| Whitetail School (historical) | School | 763 | Daniels | 48 53 42 N | 105 09 48 W |
| Whitetail Ski Trail | Trail | 1454 | Flathead | 48 29 06 N | 114 21 13 W |
| Whitetail Storage Reservoir | Reservoir | 761 | Daniels | 48 53 42 N | 105 09 32 W |
| Whitetail Valley | Valley | | Jefferson | 46 04 40 N | 112 07 28 W |
| Whitewater | Populated Place | 708 | Phillips | 48 45 34 N | 107 37 39 W |
| Whitewater (historical) | Locale | 708 | Phillips | 48 45 34 N | 107 37 39 W |
| Whitewater Creek | Stream | | Lewis and Clark | 47 24 14 N | 112 44 20 W |
| Whitewater Creek | Stream | | Phillips | 48 32 51 N | 107 25 34 W |
| Whitewater Dam | Dam | 732 | Phillips | 48 48 54 N | 107 36 56 W |
| Whitewater Lutheran Church | Church | 708 | Phillips | 48 45 34 N | 107 37 39 W |
| Whitewater Post Office | Post Office | 708 | Phillips | 48 45 34 N | 107 37 39 W |
| Whitewater Public Schools | School | 714 | Phillips | 48 45 43 N | 107 37 48 W |
| Whitford's Ranch | Locale | 659 | Phillips | 48 30 46 N | 107 18 21 W |
| Whitlash | Populated Place | 1202 | Liberty | 48 54 30 N | 111 15 11 W |
| Whitlash Cemetery | Cemetery | 1208 | Liberty | 48 54 31 N | 111 16 15 W |
| Whitlash Gas and Oil Field | Oilfield | 1145 | Liberty | 48 57 42 N | 111 14 30 W |
| Whitlash Post Office | Post Office | 1202 | Liberty | 48 54 30 N | 111 15 11 W |
| Whitlash Presbyterian Church (historical) | Church | 1202 | Liberty | 48 54 30 N | 111 15 11 W |
| Whitlash School | School | 1197 | Liberty | 48 54 34 N | 111 15 05 W |
| Whitman Coulee | Valley | | Big Horn | 45 45 40 N | 107 34 58 W |
| Whitmans Cabin | Locale | 2209 | Gallatin | 44 33 39 N | 111 07 49 W |
| Whitmore Spring Creek | Stream | | Phillips | 47 49 08 N | 108 30 13 W |
| Whitmore's Ranch | Locale | 659 | Valley | 48 28 29 N | 107 01 44 W |
| Whitmus Stock Reservoir Dam | Dam | 733 | McCone | 47 47 00 N | 105 39 02 W |
| Whitney (historical) | Locale | 697 | Prairie | 46 44 57 N | 105 04 42 W |
| Whitney Creek | Stream | | Custer | 46 22 30 N | 105 41 27 W |
| Whitney Creek | Stream | | Prairie | 46 44 54 N | 105 06 09 W |
| Whitney Creek | Stream | | Sanders | 47 54 50 N | 115 05 19 W |
| Whitney Creek | Stream | | Stillwater | 45 59 54 N | 109 18 24 W |
| Whitney Creek | Stream | | Sweet Grass | 46 00 38 N | 109 26 18 W |
| Whitney Creek School (historical) | School | 862 | Custer | 46 31 32 N | 105 01 35 W |
| Whitney Lake | Lake | 1212 | Lincoln | 47 55 18 N | 115 11 27 W |
| Whitney Post Office (historical) | Post Office | 697 | Prairie | 46 44 57 N | 105 04 42 W |
| Whitney Ranch | Locale | 1435 | Sweet Grass | 45 57 15 N | 110 01 54 W |
| Whitney School (historical) | School | 701 | Prairie | 46 44 58 N | 105 04 40 W |
| Whitney School (historical) | School | 733 | Sheridan | 48 39 10 N | 104 58 07 W |
| Whitney Springs | Spring | 1123 | Sanders | 47 55 18 N | 115 07 10 W |
| Whiton Number 2 Dam | Dam | 1118 | Powder River | 45 01 42 N | 105 41 14 W |
| Whits Lakes | Lake | 2218 | Gallatin | 44 49 01 N | 111 08 11 W |
| Whitsell Creek | Stream | | Ravalli | 45 55 34 N | 114 06 56 W |
| Whittaker Spring | Spring | 1963 | Stillwater | 45 29 48 N | 109 52 42 W |
| Whitten Creek | Stream | | Rosebud | 45 17 41 N | 106 34 53 W |
| Whittier Elementary School | School | 1461 | Gallatin | 45 41 07 N | 111 02 38 W |
| Whittier Park | Park | 1013 | Cascade | 47 30 23 N | 111 18 23 W |
| Whittier Park | Park | 1685 | Silver Bow | 45 59 19 N | 112 29 36 W |
| Whittier School | School | 1021 | Cascade | 47 30 32 N | 111 17 35 W |
| Whittier School | School | 1682 | Silver Bow | 45 59 20 N | 112 29 43 W |
| Whittier School (historical) | School | 978 | Missoula | 46 52 53 N | 113 59 53 W |
| Whittier School (historical) | School | 613 | Sheridan | 48 37 40 N | 104 05 21 W |
| Whitworth Ranch | Locale | 2290 | Beaverhead | 44 35 43 N | 112 58 20 W |
| Whodiky Dam | Dam | 658 | Valley | 48 02 24 N | 106 42 44 W |
| Whoop-Up Creek | Stream | | Musselshell | 46 42 14 N | 108 52 21 W |
| Whoop-up Rodeo Ground | Locale | 1039 | Pondera | 48 13 11 N | 111 55 45 W |
| Whoop-Up Trail Historical Marker | Park | 1058 | Pondera | 48 11 35 N | 111 56 03 W |
| Whoop-Up Trail Monument | Park | 799 | Chouteau | 47 49 18 N | 110 39 48 W |
| Whoopee Creek | Stream | | Lincoln | 48 15 34 N | 115 57 17 W |
| Whoopup Creek | Stream | | Dawson | 47 00 39 N | 104 47 12 W |
| Wibaux | Locale | 811 | Wibaux | 46 59 15 N | 104 11 12 W |
| Wibaux | Populated Place | 809 | Wibaux | 46 59 06 N | 104 11 18 W |
| Wibaux City Park | Park | 810 | Wibaux | 46 59 17 N | 104 11 12 W |
| Wibaux Clinic | Hospital | 815 | Wibaux | 46 59 12 N | 104 11 17 W |
| Wibaux Cooperative Elevator (historical) | Locale | 811 | Wibaux | 46 59 15 N | 104 11 12 W |
| Wibaux County | Civil | 848 | Wibaux | 47 01 00 N | 104 11 02 W |
| Wibaux County Cemetery | Cemetery | 840 | Wibaux | 46 59 05 N | 104 12 02 W |
| Wibaux County Courthouse | Building | 812 | Wibaux | 46 59 09 N | 104 11 19 W |
| Wibaux County Fairgrounds | Locale | 818 | Wibaux | 46 58 28 N | 104 11 12 W |
| Wibaux County Nursing Home | Hospital | 808 | Wibaux | 46 58 48 N | 104 11 17 W |
| Wibaux County Sheriff | Building | 812 | Wibaux | 46 59 09 N | 104 11 19 W |
| Wibaux Elementary School | School | 814 | Wibaux | 46 59 23 N | 104 11 32 W |
| Wibaux Fire Department | Building | 812 | Wibaux | 46 59 11 N | 104 11 24 W |
| Wibaux High School | School | 818 | Wibaux | 46 59 26 N | 104 11 46 W |
| Wibaux Park | Park | 724 | Custer | 46 24 20 N | 105 49 57 W |
| Wibaux Post Office | Post Office | 810 | Wibaux | 46 59 08 N | 104 11 18 W |
| Wibaux Public Library | Building | 814 | Wibaux | 46 59 11 N | 104 11 17 W |
| Wibaux Visitor Information Center | Building | 811 | Wibaux | 46 59 13 N | 104 11 11 W |
| WIC Clinic | Hospital | 1247 | Fergus | 47 03 30 N | 109 26 38 W |
| Wichern CCC Dam | Dam | 875 | Garfield | 47 18 24 N | 107 39 14 W |
| Wichiup Reservoir | Reservoir | 992 | Carter | 45 41 07 N | 104 31 09 W |
| Wick Landing Strip | Airport | 712 | Richland | 47 53 10 N | 104 25 40 W |
| Wickadahl Ranch | Locale | 1923 | Madison | 44 48 30 N | 111 34 10 W |
| Wicked Creek | Stream | | Park | 45 17 14 N | 110 31 28 W |
| Wicker Basket Number 1 Dam | Dam | 1110 | Fergus | 47 25 36 N | 109 22 21 W |
| Wicker Basket Number 2 Dam | Dam | 1111 | Fergus | 47 27 30 N | 109 24 51 W |
| Wickes | Populated Place | 1584 | Jefferson | 46 20 59 N | 112 06 12 W |
| Wickes (historical) | Locale | 1584 | Jefferson | 46 20 59 N | 112 06 12 W |
| Wickes Post Office (historical) | Post Office | 1584 | Jefferson | 46 20 59 N | 112 06 12 W |
| Wickes Tailings | Mine | 1580 | Jefferson | 46 21 06 N | 112 06 04 W |
| Wickes Tunnel | Tunnel | 1897 | Jefferson | 46 19 48 N | 112 06 48 W |
| Wickham Creek | Stream | | Madison | 45 41 52 N | 112 08 13 W |
| Wickham Gulch Campground | Locale | 1050 | Carter | 45 34 48 N | 104 04 17 W |
| Wickham Spring Number 1 | Spring | 1052 | Carter | 45 34 50 N | 104 04 25 W |
| Wickham Spring Number 2 | Spring | 1052 | Carter | 45 34 41 N | 104 04 18 W |
| Wickiup Creek | Stream | | Gallatin | 45 01 00 N | 111 05 28 W |
| Wickiup Creek | Stream | | Lewis and Clark | 46 53 51 N | 111 39 34 W |
| Wickiup Creek | Stream | | Lincoln | 49 00 10 N | 114 47 41 W |
| Wickiup Creek | Stream | | Madison | 45 19 57 N | 111 28 48 W |
| Wickiup Creek | Stream | | Silver Bow | 45 41 51 N | 112 32 07 W |
| Wickiup Mountain | Summit | 2216 | Flathead | 48 01 49 N | 113 48 25 W |
| Wickstrom Coulee | Valley | | Garfield | 47 02 52 N | 107 08 38 W |
| Wickum School (historical) | School | 1202 | Liberty | 48 46 10 N | 111 14 25 W |
| Wide Awake School (historical) | School | 823 | Roosevelt | 48 16 48 N | 105 41 59 W |
| Wide Awake School (historical) | School | 882 | Valley | 48 35 57 N | 106 27 32 W |
| Widemouth Gulch | Valley | | Jefferson | 46 10 05 N | 112 01 23 W |
| Widewater Lake | Lake | 2449 | Carbon | 45 00 39 N | 109 46 35 W |
| Widgeon Pond | Lake | 2025 | Beaverhead | 44 38 32 N | 111 39 03 W |
| Widgeon Pond | Reservoir | 2026 | Beaverhead | 44 38 12 N | 111 39 21 W |
| Widgeon Pond Dam | Dam | 2026 | Beaverhead | 44 38 12 N | 111 39 21 W |
| Widgeon Slough | Lake | 657 | Sheridan | 48 57 53 N | 104 14 49 W |
| Widow Coulee | Valley | | Cascade | 47 39 08 N | 111 00 51 W |