Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Proctor (historical) | Locale | 680 | Sanders | 48 03 30 N | 115 54 29 W |
| Proctor Creek | Stream | | Lake | 47 51 49 N | 114 16 47 W |
| Proctor Post Office | Post Office | 965 | Lake | 47 53 33 N | 114 18 19 W |
| Proctor School (historical) | School | 961 | Lake | 47 53 35 N | 114 18 36 W |
| Proctor School (historical) | School | 1099 | Rosebud | 45 50 43 N | 106 47 38 W |
| Procyon Dam | Dam | 1127 | Liberty | 48 46 36 N | 110 58 03 W |
| Production Lake | Lake | 3071 | Park | 45 06 10 N | 109 50 03 W |
| Professor Pool Dam | Dam | 860 | Valley | 48 57 12 N | 106 17 14 W |
| Profile Post Office (historical) | Post Office | 1414 | Golden Valley | 46 34 30 N | 109 20 30 W |
| Progress (historical) | Post Office | 1245 | Golden Valley | 46 12 37 N | 109 35 31 W |
| Progress School (historical) | School | 1245 | Golden Valley | 46 12 37 N | 109 35 31 W |
| Progressive School | School | 954 | Yellowstone | 45 53 07 N | 108 22 58 W |
| Progressive School (historical) | School | 924 | Blaine | 48 52 18 N | 108 20 44 W |
| Progressive School (historical) | School | 886 | Valley | 48 27 04 N | 105 51 34 W |
| Prohibition Rock | Pillar | 2404 | Gallatin | 45 07 32 N | 111 13 03 W |
| Prohosky Ditch | Canal | 1805 | Beaverhead | 45 02 41 N | 113 07 37 W |
| Project Post Office (historical) | Post Office | 1065 | Cascade | 47 37 10 N | 111 38 03 W |
| Promised Land Coulee | Valley | | Richland | 48 04 30 N | 104 49 43 W |
| Promised Land School (historical) | School | 1065 | Chouteau | 47 49 45 N | 111 20 30 W |
| Promised Land School Number 2 (historical) | School | 1048 | Chouteau | 47 48 53 N | 111 14 30 W |
| Prompt Care | Hospital | 632 | Lincoln | 48 23 30 N | 115 32 54 W |
| Prompt Care | Hospital | 812 | Lincoln | 48 52 31 N | 115 02 38 W |
| Proposal Rock | Pillar | 2316 | Beaverhead | 45 38 06 N | 113 21 19 W |
| Prospect Creek | Stream | | Cascade | 46 57 49 N | 110 45 22 W |
| Prospect Creek | Stream | | Lincoln | 48 20 08 N | 115 31 35 W |
| Prospect Creek | Stream | | Lincoln | 48 37 42 N | 115 53 56 W |
| Prospect Creek | Stream | | Sanders | 47 35 27 N | 115 21 32 W |
| Prospect Creek Mine | Mine | 911 | Sanders | 47 32 36 N | 115 31 46 W |
| Prospect Gulch | Valley | | Mineral | 47 01 03 N | 114 59 09 W |
| Prospect Heights School (historical) | School | 646 | Dawson | 47 07 10 N | 104 42 14 W |
| Prospect Hill | Summit | 1187 | Lincoln | 48 19 45 N | 115 35 07 W |
| Prospect Mine | Mine | 1829 | Madison | 45 17 24 N | 111 57 51 W |
| Prospect Mine | Mine | 1918 | Madison | 45 16 60 N | 111 57 48 W |
| Prospect Mountain Number One | Summit | 2141 | Mineral | 47 03 04 N | 115 00 56 W |
| Prospect Mountain Number Two | Summit | 2102 | Mineral | 47 02 18 N | 115 00 17 W |
| Prospect Park School (historical) | School | 949 | Flathead | 48 14 25 N | 114 25 03 W |
| Prospect Peak | Summit | 1983 | Chouteau | 47 27 26 N | 110 30 32 W |
| Prospect Post Office (historical) | Post Office | 1050 | Toole | 48 16 42 N | 111 25 33 W |
| Prospect Ridge | Ridge | 2380 | Judith Basin | 46 53 27 N | 110 32 20 W |
| Prospect School (historical) | School | 889 | Valley | 48 54 46 N | 106 19 22 W |
| Prospect Shafts Trail | Trail | 1440 | Lewis and Clark | 46 35 23 N | 112 03 31 W |
| Prospector Mine | Mine | 1709 | Silver Bow | 46 00 25 N | 112 34 19 W |
| Prospector Mountain | Summit | 2465 | Flathead | 48 06 17 N | 113 37 37 W |
| Prospector Park | Park | 1006 | Rosebud | 45 54 45 N | 106 37 25 W |
| Prospector/Brodie Number 2 Mine | Mine | 2324 | Silver Bow | 46 00 50 N | 112 26 32 W |
| Prosperity-Granite Ditch | Canal | 1102 | Carbon | 45 28 51 N | 108 52 60 W |
| Prost School (historical) | School | 837 | Phillips | 48 30 60 N | 108 15 32 W |
| Providence Hall | Building | 1052 | Cascade | 47 29 32 N | 111 16 11 W |
| Provost Coulee | Valley | | Phillips | 48 46 08 N | 107 35 32 W |
| Prtrolla Lake | Reservoir | 884 | Petroleum | 46 56 24 N | 108 14 32 W |
| Pruden Creek | Stream | | Lewis and Clark | 47 09 43 N | 112 13 05 W |
| Pruitt Park | Park | 2028 | Park | 45 31 51 N | 110 17 32 W |
| Prune Post Office (historical) | Post Office | 765 | Sanders | 47 19 17 N | 114 18 35 W |
| Prune Spring | Spring | 1193 | Rosebud | 45 19 12 N | 106 23 56 W |
| Pryde Ditch | Canal | 1705 | Carbon | 45 12 17 N | 109 15 13 W |
| Pryor | Populated Place | 1240 | Big Horn | 45 25 47 N | 108 31 59 W |
| Pryor (historical) | Locale | 1240 | Big Horn | 45 25 47 N | 108 31 59 W |
| Pryor Cemetery | Cemetery | 1290 | Big Horn | 45 25 10 N | 108 30 42 W |
| Pryor Creek | Stream | | Yellowstone | 45 53 15 N | 108 18 57 W |
| Pryor Creek Boarding School (historical) | School | 1252 | Big Horn | 45 24 53 N | 108 33 27 W |
| Pryor Ditch Number One | Canal | 1314 | Big Horn | 45 23 28 N | 108 32 33 W |
| Pryor Ditch Number Three | Canal | 1264 | Big Horn | 45 24 44 N | 108 33 05 W |
| Pryor Ditch Number Two | Canal | 1287 | Big Horn | 45 23 29 N | 108 33 30 W |
| Pryor Gap | Gap | 1484 | Big Horn | 45 17 33 N | 108 36 08 W |
| Pryor Land Number 1 Dam | Dam | 1331 | Big Horn | 45 22 54 N | 108 20 38 W |
| Pryor Mountain Wild Horse Range | Park | 1581 | Carbon | 45 03 12 N | 108 19 21 W |
| Pryor Mountains | Range | 1960 | Carbon | 45 14 60 N | 108 30 02 W |
| Pryor Mountains Historical Marker | Park | 1094 | Carbon | 45 20 37 N | 108 54 55 W |
| Pryor Post Office | Post Office | 1240 | Big Horn | 45 25 47 N | 108 31 59 W |
| Pryor Public School | School | 1239 | Big Horn | 45 25 43 N | 108 32 00 W |
| Pryor Ranch | Locale | 1343 | Jefferson | 45 55 34 N | 111 55 48 W |
| Pryor Valley Assembly Church | Church | 1240 | Big Horn | 45 25 47 N | 108 31 59 W |
| Ptarmigan Bowl Ski Trail | Trail | 1454 | Flathead | 48 29 06 N | 114 21 13 W |
| Ptarmigan Creek | Stream | | Glacier | 48 49 06 N | 113 42 57 W |
| Ptarmigan Falls | Falls | 1725 | Glacier | 48 49 17 N | 113 42 42 W |
| Ptarmigan Lake | Lake | 2021 | Glacier | 48 50 40 N | 113 42 40 W |
| Ptarmigan Mountain | Summit | 2621 | Missoula | 47 24 41 N | 113 31 15 W |
| Ptarmigan Ski Trail | Trail | 1863 | Gallatin | 45 49 02 N | 110 53 48 W |
| Ptarmigan Trail | Trail | 1828 | Glacier | 48 52 22 N | 113 42 31 W |
| Ptarmigan Tunnel | Tunnel | 2164 | Glacier | 48 50 57 N | 113 42 28 W |
| Ptarmigan Wall | Ridge | 2244 | Glacier | 48 51 02 N | 113 42 35 W |
| Puckett Reservoir | Reservoir | 775 | Phillips | 48 00 22 N | 107 50 05 W |
| Puett Post Office (historical) | Post Office | 1521 | Sweet Grass | 46 05 42 N | 109 57 03 W |
| Pugh Coulee | Valley | | Phillips | 47 36 33 N | 108 29 48 W |
| Pugsley Bridge | Bridge | 856 | Liberty | 48 17 27 N | 111 02 46 W |
| Pugsley Reservoir | Reservoir | 864 | Liberty | 48 15 31 N | 111 01 27 W |
| Puller Gulch | Valley | | Granite | 46 17 00 N | 113 31 28 W |
| Puller Hot Springs | Spring | 1673 | Madison | 45 10 16 N | 112 09 14 W |
| Puller Hot Springs (historical) | Locale | 1674 | Madison | 45 10 18 N | 112 09 15 W |
| Puller Springs Post Office (historical) | Post Office | 1661 | Madison | 45 10 30 N | 112 08 60 W |
| Puller Springs School (historical) | School | 1661 | Madison | 45 10 30 N | 112 08 60 W |
| Pulp Camp | Locale | 2029 | Gallatin | 44 39 05 N | 111 06 46 W |
| Pulpit Mountain | Summit | 1985 | Lincoln | 48 31 44 N | 115 47 18 W |
| Pulpit Mountain National Recreation Trail | Trail | 1708 | Lincoln | 48 30 54 N | 115 48 21 W |
| Pulpit Ridge | Ridge | 1531 | Lincoln | 48 30 56 N | 115 48 44 W |
| Pulpit Rock | Pillar | 2097 | Gallatin | 45 04 60 N | 111 12 43 W |
| Pulpit Rock | Summit | 1572 | Jefferson | 46 14 12 N | 112 08 31 W |
| Puma Creek | Stream | | Powell | 47 21 52 N | 113 18 33 W |
| Puma Peak | Summit | 2602 | Powell | 47 20 29 N | 113 18 55 W |
| Puma Ski Trail | Trail | 1816 | Lewis and Clark | 46 45 12 N | 112 18 50 W |
| Pump Creek | Stream | | Custer | 45 58 42 N | 106 04 08 W |
| Pump Ranch | Locale | 1620 | Wheatland | 46 21 04 N | 110 15 44 W |
| Pumpelly Glacier | Glacier | 2574 | Flathead | 48 34 60 N | 113 39 33 W |
| Pumpelly Pillar | Pillar | 2273 | Glacier | 48 28 29 N | 113 27 02 W |
| Pumping Plant Park | Park | 723 | Custer | 46 24 15 N | 105 52 12 W |
| Pumpkin Coulee | Valley | | Prairie | 46 44 30 N | 104 45 37 W |
| Pumpkin Creek | Stream | | Custer | 46 15 06 N | 105 45 17 W |
| Pumpkin Glacier | Glacier | 2509 | Flathead | 48 35 03 N | 113 39 27 W |
| Punch Bowl Creek | Stream | | Carbon | 45 14 07 N | 108 20 12 W |
| Punch Creek | Stream | | Teton | 48 05 33 N | 112 57 22 W |