All - Architectural style - Neoclassical architecture
| San Rafael Improvement Club |
| San Saba County Courthouse |
| Santa Fe Freight Depot |
| Sather Gate and Bridge |
| Satterfield, Emory Edward, House |
| Sauk County Courthouse |
| Saul, B.F., Building |
| Saunders, Daniel, School |
| Sauser-Lane House |
| Scales, Absalom, House |
| Scarborough, Henry Lee, House |
| Scarborough House |
| Schenectady City Hall and Post Office |
| Schmitt House |
| Schoolfield Welfare Building |
| Schowengerdt, Ernst, House |
| Schreiber, Adolph, House |
| Schriber, Hyman, Building |
| Science Building |
| Scofield-Sanor House |
| Scott, Irving Murray, School |
| Scottish Rite Cathedral |
| Scottish Rite Cathedral |
| Scottish Rite Cathedral |
| Scottish Rite Consistory Building |
| Scottish Rite Temple |
| Scottish Rite Temple |
| Scott, L. A., House |
| Scotts Bluff County Courthouse |
| Scott Street School |
| Scruggs-Vandervoort-Barney Warehouse |
| Scully Ranch |
| Sears, Roebuck and Company Retail Department Store-Camden |
| Second Church of Christ Scientist |
| Second Church of Christ Scientist |
| Second National Bank |
| Second National Bank of Meyersdale |
| Security Bank Building |
| Security Building |
| Segal Building |
| Selby Opera House |
| Self-Trott-Bickett House |
| Senter-Rooks House |
| Settlement School |
| Seventh Street Savings Bank |
| Seward County Courthouse |
| Shaarai Torah Synagogue |
| Shaarei Tfiloh Synagogue |
| Shackford Hall |
| Shadowcliff |
| Shady Rest |
| Shaughnessy, Martin, Building |
| Shaw Hall, West Liberty State College |
| Shawnee Hotel |
| Shea's Seneca Building |
| Shelbyville High School |
| Shelden-Dee Block |
| Sheldon Hall |
| Shepherdstown Historic District |
| Sheridan County Courthouse |
| Shiawassee County Courthouse |
| Shiloh Baptist Church |
| Shirk-Edwards House |
| Shore High School |
| Shoreland Arcade |
| Shorewood Village Hall |
| Shortridge High School |
| Shotguns at 1203-1205 Bob Harrison |
| Shreveport Municipal Building |
| Sibley, Frederic M., Lumber Company Office Building |
| Sigma Alpha Epsilon Building |
| Sikes, John C., House |
| Simmons Colored School |
| Simmons, Gilbert M., Memorial Library |
| Simmons, James B., House |
| Simms School Building |
| Simpson County Courthouse |
| Sion Hill |
| Sioux County Courthouse |
| Sitgreaves House |
| Sixteenth Street School |
| Skagit River and Newhalem Creek Hydroelectric Projects |
| Slater Building |
| Sloan House |
| Slocum Hall |
| Smith, Alvin T., House |
| Smith-Barron House |
| Smith, Elven C., House |
| Smith-Ely Mansion |
| Smith, Lena O., House |
| Smith-Peterson House |
| Smith, William E., House |
| Smith, W. W., House |
| Smoot, Richmond Kelley, House |
| Smoot Theater |
| Snow Academy Building |
| Sokol Gymnasium |
| Soldiers and Sailors Memorial Auditorium |
| Soldiers and Sailors Memorial Hall |
| Solvay Public Library |
Data from United States Park Service and Wikidata
