Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Pioneer School (historical) | School | 1255 | Stillwater | 45 50 30 N | 109 10 20 W |
| Pipe Creek | Stream | | Lincoln | 48 25 26 N | 115 36 24 W |
| Pipe Creek Campground | Locale | 949 | Lincoln | 48 36 17 N | 115 37 01 W |
| Pipe Organ Lodge | Locale | 1634 | Beaverhead | 45 03 59 N | 112 48 14 W |
| Pipe Organ Rock | Pillar | 1670 | Beaverhead | 45 04 02 N | 112 48 14 W |
| Piper | Populated Place | 1339 | Fergus | 46 59 24 N | 109 12 02 W |
| Piper (historical) | Locale | 1339 | Fergus | 46 59 24 N | 109 12 02 W |
| Piper Creek | Stream | | Lake | 47 40 31 N | 113 48 58 W |
| Piper Draw | Valley | | Powder River | 45 19 05 N | 106 01 17 W |
| Piper Draw Spring | Spring | 1152 | Powder River | 45 17 54 N | 106 00 41 W |
| Piper Lake | Lake | 1919 | Lake | 47 37 34 N | 113 56 02 W |
| Piper Post Office (historical) | Post Office | 1339 | Fergus | 46 59 24 N | 109 12 02 W |
| Piper-Crow Pass | Gap | 2090 | Lake | 47 36 08 N | 113 56 57 W |
| Pipes Coulee | Valley | | Fergus | 47 27 02 N | 108 24 58 W |
| Pipestone | Locale | 1428 | Jefferson | 45 54 19 N | 112 13 13 W |
| Pipestone | Populated Place | 1389 | Jefferson | 45 53 48 N | 112 13 53 W |
| Pipestone Campground | Locale | 1385 | Jefferson | 45 53 45 N | 112 13 53 W |
| Pipestone Ditch | Canal | 1384 | Jefferson | 45 53 10 N | 112 10 10 W |
| Pipestone Hot Springs | Populated Place | 1379 | Jefferson | 45 53 39 N | 112 13 51 W |
| Pipestone Pass | Gap | 1974 | Silver Bow | 45 51 24 N | 112 26 22 W |
| Pipestone Post Office (historical) | Post Office | 1389 | Jefferson | 45 53 48 N | 112 13 53 W |
| Pipestone Rock | Summit | 1853 | Jefferson | 45 56 12 N | 112 19 38 W |
| Pipestone Springs Post Office (historical) | Post Office | 1389 | Jefferson | 45 53 48 N | 112 13 53 W |
| Pipit Lake | Lake | 2921 | Sweet Grass | 45 16 22 N | 110 06 19 W |
| Pippen Dam | Dam | 766 | Valley | 48 14 24 N | 107 17 44 W |
| Pippin Reservoir | Reservoir | 757 | Valley | 48 12 14 N | 107 13 25 W |
| Pippin School (historical) | School | 695 | Valley | 48 14 48 N | 107 15 57 W |
| Piquett Creek | Stream | | Ravalli | 45 52 15 N | 114 11 49 W |
| Piquett Lake | Lake | 2440 | Ravalli | 45 44 17 N | 114 11 22 W |
| Piquett Mountain | Summit | 2678 | Ravalli | 45 43 54 N | 114 11 30 W |
| Pirate Dam | Dam | 1267 | Chouteau | 47 28 30 N | 110 42 39 W |
| Pirate Lake | Reservoir | 1267 | Chouteau | 47 28 30 N | 110 42 39 W |
| Pirogue Island | Island | 716 | Custer | 46 26 26 N | 105 49 02 W |
| Pirogue Island State Park | Park | 716 | Custer | 46 26 26 N | 105 49 02 W |
| Pish Dam | Dam | 1265 | Glacier | 48 49 60 N | 112 33 45 W |
| Pishkun Canal | Canal | 1353 | Teton | 47 39 38 N | 112 35 26 W |
| Pishkun Dikes 1,2,3,4,5,6, and 7 | Dam | 1333 | Teton | 47 40 36 N | 112 29 51 W |
| Pishkun National Wildlife Refuge | Park | 1337 | Teton | 47 40 51 N | 112 28 23 W |
| Pishkun Reservoir | Reservoir | 1333 | Teton | 47 40 36 N | 112 29 41 W |
| Pishkun Reservoir | Reservoir | 1333 | Teton | 47 40 36 N | 112 29 51 W |
| Pishkun Reservoir Fishing Access Site | Locale | 1333 | Teton | 47 40 54 N | 112 27 55 W |
| Piskun Ridge Ski Trail | Trail | 1816 | Lewis and Clark | 46 45 12 N | 112 18 50 W |
| Pistol Bullet Dam | Dam | 1461 | Glacier | 48 50 36 N | 113 12 15 W |
| Pistol Creek | Stream | | Beaverhead | 44 55 18 N | 112 35 27 W |
| Pistol Creek | Stream | | Lake | 47 11 33 N | 113 56 17 W |
| Pistol Creek | Stream | | Lake | 47 19 42 N | 114 08 32 W |
| Pistol Creek | Stream | | Meagher | 46 43 34 N | 110 49 34 W |
| Pit Parks Ski Trail | Trail | 1816 | Lewis and Clark | 46 45 12 N | 112 18 50 W |
| Pitamakan Lake | Lake | 2076 | Glacier | 48 31 18 N | 113 27 26 W |
| Pitamakan Pass | Gap | 2299 | Glacier | 48 31 04 N | 113 27 31 W |
| Pitamakan Pass Trail | Trail | 1920 | Flathead | 48 32 13 N | 113 28 49 W |
| Pitcher Creek | Stream | | Gallatin | 45 39 22 N | 110 56 24 W |
| Pitchfork Creek | Stream | | Big Horn | 45 13 56 N | 108 10 42 W |
| Pittman Draw | Valley | | Rosebud | 45 24 46 N | 106 19 40 W |
| Pittman Draw Spring | Spring | 1092 | Rosebud | 45 24 16 N | 106 20 28 W |
| Pittman Reservoir | Reservoir | 1026 | Rosebud | 45 24 37 N | 106 17 40 W |
| Pittsmont (historical) | Locale | 1705 | Powell | 46 37 60 N | 112 19 03 W |
| Pitzer School (historical) | School | 819 | Garfield | 47 08 58 N | 106 19 54 W |
| Piute Creek | Stream | | Beaverhead | 44 43 19 N | 112 03 50 W |
| Pivot Mountain | Summit | 2254 | Flathead | 47 53 39 N | 113 11 40 W |
| Place Creek | Stream | | Gallatin | 45 42 03 N | 110 55 50 W |
| Place Where the White Horse Went Down Historical Marker | Park | 946 | Yellowstone | 45 47 55 N | 108 28 32 W |
| Placer | Mine | 1873 | Lewis and Clark | 46 27 23 N | 112 15 53 W |
| Placer 2313 Mine | Mine | 1647 | Jefferson | 46 16 50 N | 112 14 58 W |
| Placer Basin | Basin | 2673 | Sweet Grass | 45 25 15 N | 110 05 04 W |
| Placer Basin Creek | Stream | | Park | 45 12 28 N | 110 41 48 W |
| Placer Creek | Stream | | Beaverhead | 45 39 06 N | 113 42 37 W |
| Placer Creek | Stream | | Granite | 46 04 53 N | 113 30 38 W |
| Placer Creek | Stream | | Judith Basin | 47 00 01 N | 110 30 54 W |
| Placer Creek | Stream | | Madison | 45 26 29 N | 111 27 25 W |
| Placer Creek | Stream | | Meagher | 46 58 02 N | 110 59 32 W |
| Placer Creek | Stream | | Sanders | 48 05 53 N | 115 39 56 W |
| Placer Creek Mine | Mine | 2352 | Madison | 45 26 50 N | 111 28 33 W |
| Placer Gulch | Valley | | Jefferson | 46 12 49 N | 112 26 35 W |
| Placer Gulch | Valley | | Sweet Grass | 45 36 55 N | 109 54 19 W |
| Placer Gulch Mine | Mine | 1620 | Sweet Grass | 45 36 14 N | 109 55 18 W |
| Placer Mine | Mine | 1359 | Granite | 46 33 23 N | 113 12 20 W |
| Placer Mine | Mine | 46 | Jefferson | 46 23 58 N | 112 16 27 W |
| Placer Mine | Mine | 1366 | Powell | 46 33 19 N | 112 54 52 W |
| Placer Mines | Mine | 1801 | Beaverhead | 45 09 47 N | 113 00 44 W |
| Placer Mines | Mine | 1457 | Powell | 46 31 05 N | 112 55 53 W |
| Placer Post Office (historical) | Post Office | 1525 | Granite | 46 18 50 N | 113 31 43 W |
| Placer School (historical) | School | 1311 | Broadwater | 46 29 23 N | 111 40 33 W |
| Placid Creek | Stream | | Missoula | 47 06 58 N | 113 32 31 W |
| Placid Lake | Lake | 1257 | Missoula | 47 07 09 N | 113 31 27 W |
| Placid Lake Campground | Locale | 1260 | Missoula | 47 07 58 N | 113 31 27 W |
| Placid Lake Recreation Site | Locale | 1261 | Missoula | 47 07 06 N | 113 30 08 W |
| Placid Lake Recreation Site | Locale | 1269 | Missoula | 47 07 59 N | 113 31 25 W |
| Placid Lake School (historical) | School | 1269 | Missoula | 47 07 57 N | 113 33 43 W |
| Placid Lake State Park | Park | 1346 | Missoula | 47 07 50 N | 113 31 03 W |
| Plaggemeyer Homestead | Locale | 1467 | Sweet Grass | 45 58 08 N | 110 02 60 W |
| Plains | Locale | 754 | Sanders | 47 27 29 N | 114 52 52 W |
| Plains | Populated Place | 755 | Sanders | 47 27 37 N | 114 52 58 W |
| Plains Airport | Airport | 753 | Sanders | 47 28 20 N | 114 54 03 W |
| Plains Bible Chapel | Church | 755 | Sanders | 47 27 37 N | 114 52 58 W |
| Plains Cemetery | Cemetery | 764 | Sanders | 47 28 20 N | 114 52 53 W |
| Plains District Ranger Office | Locale | 756 | Sanders | 47 27 57 N | 114 53 02 W |
| Plains Feed and Grain Elevator | Locale | 755 | Sanders | 47 27 45 N | 114 53 28 W |
| Plains Golf Course | Locale | 751 | Sanders | 47 29 40 N | 114 54 43 W |
| Plains Post Office | Post Office | 755 | Sanders | 47 27 29 N | 114 52 50 W |
| Plains Public Library | Building | 755 | Sanders | 47 27 37 N | 114 52 58 W |
| Plains Public Schools | School | 756 | Sanders | 47 27 55 N | 114 53 05 W |
| Plains United Methodist Church | Church | 755 | Sanders | 47 27 37 N | 114 52 58 W |
| Plainsmen Field | Park | 749 | Daniels | 48 47 41 N | 105 24 27 W |
| Plainsview School (historical) | School | 808 | Phillips | 48 53 51 N | 107 31 18 W |
| Plainview School (historical) | School | 1501 | Carbon | 45 18 35 N | 109 10 40 W |
| Plainview School (historical) | School | 997 | Carter | 45 32 23 N | 104 04 06 W |
| Plainview School (historical) | School | 1015 | Petroleum | 47 06 07 N | 108 39 11 W |
| Plainview School (historical) | School | 1002 | Petroleum | 47 09 19 N | 108 42 55 W |
| Plainview School (historical) | School | 1140 | Pondera | 48 21 07 N | 112 14 52 W |