Montana - Area of significance: Architecture
| Rising Sun Auto Camp |
| Rising Wolf |
| Riverside |
| Riverside Park, Laurel |
| Robworth Apartments |
| Rock Creek Guard Station (24GN165) |
| Rock Creek Ranger Station Historic District |
| Rock Creek State Bank |
| Rocky Mountain Laboratory Historic District |
| Rocky Valley Lutheran Church |
| Roes Creek Campground Camptender's Cabin |
| Rogers House |
| Rolfson House |
| Roose-Eckelberry House |
| Rosebud County Courthouse |
| Rossiter, H. D., Building |
| Rouse House |
| Rundle Building |
| Russell School |
| Ruth, Harold and Marion, House |
| Sacajawea Hotel |
| Sacajawea-Miles Parks Historic District |
| 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 |
| Sauser-Mercord Building |
| Savenac Nursery Historic District |
| Scalplock Mountain Fire Lookout |
| Scherlie, Anna, Homestead Shack |
| Schoenberger, Charlie, Homestead |
| School |
| Schroeder Hospital |
| Scott-Forhan House |
| Sedan School |
| Sharp, John, House |
| Sharp's, Jay, Store |
| Shaw’s Best Factory |
| Sheehan Boardinghouse |
| Shenango Work Station |
| Sherburne Ranger Station Historic District |
| Sherman, Byron R., House |
| Sherwood Lodge |
| Shore, Thomas and Beulah, House |
| Silver Bow County Poor Farm Hospital |
| Silver King Ranch |
| Silverman, Morris, House |
| Simmonsen's House |
| Sims-Garfield Ranch |
| Sixty-Three Ranch |
| Skyland Camp-Bowman Lake Ranger Station |
| Slayton Mercantile Co. |
| Smith House |
| Smith, T. W., House |
| Snell, Walrond and Elizabeth, House |
| Snyder House |
| Soldiers' Home Historic District |
| Southern Hotel |
| South Tracy Avenue Historic District |
| South Tracy-South Black Historic District |
| South Willson Historic District |
| Spalding-Gunn House |
| Spanish Creek School |
| Spannring, John Otto, Family Farm |
| Sperry Chalets |
| Spieth and Krug Brewery |
| Spieth Houses |
| Springhill School |
| Square Butte Jail |
| Square Butte School |
| Stark House |
| Stark School |
| State Bank of Townsend |
| Stateler Memorial Methodist Church |
| St. Benedict's Catholic School |
| Stearns Hall |
| Stedman Foundry and Machine Company |
| Sterling, Fred T., House |
| Stevens, Dominic, House |
| Stevensville Grade School-United Methodist Church |
| St. Francis Xavier Church |
| St. Ignatius Mission |
| Stillwater County Courthouse |
| St. James Episcopal Church and Parish House |
| St. James Episcopal Church and Rectory |
| St. Joseph Catholic Church |
| St. Joseph's Catholic Church |
| St. Joseph's Catholic Mission Church |
| St. Joseph's Hospital |
| St. Leo's Catholic Church |
| St. Mark's Episcopal Church |
| St. Mark's Episcopal Church |
| St. Mary Peak Lookout |
| St. Mary Utility Area Historic District |
| Stockmen's Bank of Martinsdale |
Data from United States Park Service and Wikidata
