Colorado - Area of significance: Architecture
| Saddlehorn Caretaker's House and Garage |
| Saddlehorn Comfort Station |
| Saddlehorn Utility Area Historic District |
| Saguache Downtown Historic District |
| Saguache School and Jail Buildings |
| Saint Philomena Catholic Parish School |
| Saint Thomas Theological Seminary |
| Salazar, A.A., House |
| Salida Downtown Historic District |
| Salida Livestock Commission Company |
| Salina School |
| Salt Works Ranch |
| Sand Canyon Archaeological District |
| Sandstone Ranch |
| San Juan Avenue Historic District |
| San Rafael Historic District |
| Santa Fe Railway Manzanola Depot |
| Schleier, George, Mansion |
| Schlessinger House |
| Schlichter, E.A., House |
| Schmidt, George, House |
| Schnell Farm |
| Sciumbato, Daniel, Grocery Store |
| Scott Apartments and Garage, The |
| Second Midland School |
| Sedgwick County Courthouse |
| Seventeen Mile House |
| Seven Towers Pueblo |
| Shadow Mountain Lookout |
| Shaffer, Henry K. and Mary E., House |
| Shaffer, John C., Barn |
| Shannon Farm |
| Sheedy Mansion |
| Sherman and Ross Block Building |
| Sherman Street Historic District |
| Sherman Street Historic Residential District |
| Shilling-Lamb House |
| Shirley Hotel |
| Shove Memorial Chapel |
| Shrine of the Sun |
| Silesca Ranger Station |
| Silver Plume Depot |
| Sinclaire, Reginald, House |
| Sixth Avenue Community Church |
| SLW Ranch |
| Smiley Junior High School |
| Smith, Edwin L. Building |
| Smith-Elisha House |
| Smith-Eslick Cottage Court |
| Smith-Friskey Ranch |
| Smith House |
| Smith, Milo A., House |
| Smith, Pierce T., House |
| Smith, William, House |
| Smuggler-Union Hydroelectric Power Plant |
| Soda Creek Ranch |
| Solandt Memorial Hospital |
| Soldner Home and Studio |
| Solomon Batterson Ranch (Rural Historic Landscape) |
| South High School |
| South Park Community Church |
| South Side-Baker Historic District |
| S.P.M.D.T.U. Concilio Superior |
| Spratlen-Anderson Wholesale Grocery Company-Davis Brothers Warehouse |
| Springfield Schoolhouse |
| Spring House-Moynahan House |
| Spring Valley School |
| Spruce Hall |
| Spruce Lodge |
| Squires-Tourtellot House |
| St. Andrews Episcopal Church |
| Stanley Arms |
| Stanley Hotel |
| Stanley Hotel District |
| St. Anthony's Roman Catholic Church |
| Starbuck Park |
| Star Filling Station |
| Star Journal Model Home |
| Starr Manor |
| State Armory |
| Staunton Ranch Rural Historic Landscape |
| St. Dominic's Church |
| Steamboat Apartments |
| Steamboat Laundry Building |
| Steamboat Springs Depot |
| Stearns House |
| St. Elizabeth's Church |
| St. Elizabeth's Retreat Chapel |
| St. Elmo Historic District |
| Sterling Public Library |
| Sterling Union Pacific Railroad Depot |
| Stickney, Charles H., House |
| St. Ignatius Loyola Church |
| St. James Episcopal Church |
| St. John's Cathedral |
| St. John's Greek Orthodox Church |
| St. Joseph's Church |
| St. Joseph's Roman Catholic Church of Denver |
| St. Mark's Parish Church |
| St. Mark United Presbyterian Church |
Data from United States Park Service and Wikidata
