P
| Pablo | Plentywood |
| Park City | Plevna |
| Paxton | Polson |
| Pendroy | Pony |
| Philipsburg | Poplar |
| Piniele | Power |
| Plains |
| Montana Historical Society Research Center |
| 225 North Roberts, P.O. Box 201201, Helena, MT 59620-1201, 406-444-2681, 406-444-2696 (fax). |
| mhslibrary@mt.gov |