Montana - Criteria: A (event)
| Reno Apartments |
| Ressler, Guy, Homestead House |
| Rialto Theater |
| Rinard House |
| Rising Sun Auto Camp |
| Rising Wolf |
| Robbers Roost |
| Robinson, Fred, Bridge |
| Rock Creek State Bank |
| Rocky Springs Segment of the Whoop-Up Trail |
| Roes Creek Campground Camptender's Cabin |
| Rosebud Battlefield-Where the Girl Saved Her Brother |
| Rosebud County Courthouse |
| Rosebud County Deaconess Hospital |
| Rossiter, H. D., Building |
| Roundup Central School |
| Ruby Theatre |
| Rundle Building |
| Ruth, Harold and Marion, House |
| Sacajawea Hotel |
| Saco Mercantile |
| Saint John the Baptist Catholic Church |
| 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 |
| Scandinavian Methodist Church |
| Scenic Bridge |
| Scherlie, Anna, Homestead Shack |
| Shaffer's Chapel African Methodist Episcopal Church |
| Sheehan Boardinghouse |
| Sheep Creek Bridge |
| Shelby Town Hall |
| Sherburne Ranger Station Historic District |
| Sherwood Lodge |
| Shore, Thomas and Beulah, House |
| Silver Bow Brewery Malt House |
| Silver Bow County Poor Farm Hospital |
| Silver Creek School |
| Simons Block |
| Sims-Garfield Ranch |
| Skyland Camp-Bowman Lake Ranger Station |
| Slayton Mercantile Co. |
| Sleeping Buffalo Rock |
| Slide Lake-Otatso Creek Patrol Cabin and Woodshed |
| Smith Mine Historic District |
| Snell, Walrond and Elizabeth, House |
| Socialist Hall |
| Soldiers' Home Historic District |
| Southern Hotel |
| Spalding-Gunn House |
| Spannring, John Otto, Family Farm |
| Sperry Chalets |
| Spieth and Krug Brewery |
| Springhill School |
| Square Butte School |
| Stafford's Grocery |
| Stark School |
| State Bank of Townsend |
| Stateler Memorial Methodist Church |
| St. Benedict's Catholic School |
| Stearns Hall |
| Stevensville Feed Mill |
| Stevensville Grade School-United Methodist Church |
| St. Francis Xavier Church |
| St. Ignatius Mission |
| St. James Episcopal Church and Parish House |
| St. James Episcopal Church and Rectory |
| 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's Church and Pharmacy |
| St. Mary Utility Area Historic District |
| Stockmen's Bank of Martinsdale |
| Stoltz House |
| St. Paul's Episcopal Church |
| St. Peter's Mission Church and Cemetery |
| St. Philip's Episcopal Church |
| St. Richard's Church |
| Studebaker Building |
| St. Xavier Mission Church and Rectory |
| Summers-Quast Farmstead |
| Sun Camp Fireguard Cabin |
| Superior School |
| Suydam, Hester E., Boarding House |
| Swan River Community Hall |
| Swanson Boathouse |
| Swiftcurrent Auto Camp Historic District |
| Swiftcurrent Fire Lookout |
| Swiftcurrent Ranger Station Historic District |
| Symes Hotel |
| Temple Emanu-El |
| Tenth Street Bridge |
| Teton County Courthouse |
Data from United States Park Service and Wikidata
