Montana - Role: Building
| Olive Hotel |
| Oliver Building |
| Olsen House |
| Olsson, Don E., House and Garage |
| O'Neil Lumber Company Office |
| Oregon Short Line Passenger Depot |
| Outlook Depot |
| Palace Hotel |
| Panton House |
| Paradise School |
| Parberry Block East |
| Parmly Billings Memorial Library |
| Pass Creek School |
| Pass Creek Snowshoe Cabin |
| Paxson, Edgar, House |
| Pease's, George, Second Store |
| Pelton, Charles and Gladys, House |
| Peoples' Congregational Church |
| Peterson House |
| Peterson Place |
| Philipsburg Grade School |
| Phillips County Carnegie Library |
| Pine Apartments |
| Pine Butte School |
| Ping, J. J., House |
| Poker Jim Butte Fire Lookout |
| Polson Feed Mill |
| Pope, Francis and Hannah, House |
| Popham Ranch |
| Porter Flats Apartments |
| Porter Ranch Barn |
| Potomac School |
| Powder House |
| Power, C. B., Bungalow |
| Prescott, Clarence R., House |
| Prescott Commons |
| Preston House |
| Quartz Lake Patrol Cabin |
| Quaw, Thomas, House |
| Quinn's Garage |
| Raftery, William, Homestead |
| Rahrer, Francis, House |
| Railroad Depot |
| Rainbow Conoco |
| Randall, Harry E., House |
| Rankin Ranch |
| Ravalli County Courthouse |
| Rea School |
| Recreation Hall |
| Red Lodge Communal Mausoleum |
| Reed and Bowles Trading Post |
| Reed's Fort Post Office |
| Reese Creek School |
| Regan, Thomas P., Cabin |
| Regis Grocery |
| Reid House |
| Reid-Kent House |
| Reno Apartments |
| Ressler, Guy, Homestead House |
| Rialto Theater |
| Rinard House |
| Ringeling House |
| Ringleberg, Cornelius, House |
| Riverside |
| River View Dairy Barn |
| Robbers Roost |
| Roberts Building |
| Robworth Apartments |
| Rock Creek Guard Station (24GN165) |
| Rock Creek State Bank |
| Rocky Valley Lutheran Church |
| Roes Creek Campground Camptender's Cabin |
| Rogers House |
| Rolfson House |
| Roose-Eckelberry House |
| Rosebud County Courthouse |
| Rosebud County Deaconess Hospital |
| Rossiter, H. D., Building |
| Roundup Central School |
| Rouse House |
| Ruby Theatre |
| Ruffatto School |
| Rundle Building |
| Russell, Charles M., House and Studio |
| Russell, Charlie and Nancy, Honeymoon Cabin |
| Russell School |
| Ruth, Harold and Marion, House |
| Ryan's, John, House |
| Sacajawea Hotel |
| Saco Mercantile |
| Sacred Heart Church |
| Sage Creek Ranger Station |
| Saint John the Baptist Catholic Church |
| Saint Mary of the Assumption |
| Saint Mary Ranger Station |
| Saint Mary Visitor Center, Entrance Station and Checking Stations |
| Sanders County Jail |
| Sanders Gynmasium and Community Hall |
| Sandstone and Cobblestone Schools |
| Sargent, Charles C., House |
Data from United States Park Service and Wikidata
