Ohio - Criteria: C (architecture/engineering)
| Shore High School |
| Short North Historic District |
| Shuey's Mill |
| Shull-Lugenbuhl Farm |
| Sidney Walnut Avenue Historic District |
| Sidney Waterworks And Electric Light Building |
| Sigma Aplpha Epsilon Chapter House of Miami University |
| Sig's General Store |
| Silk City Diner #4655 |
| Simmons, Edwin H., House |
| Simpson, Walter, House |
| Simpson, William A., House |
| Skeele, Capt. J. S., House |
| Skywood Farms |
| Slingluff, Dr. Joseph, House |
| Sloane, Rush R., House |
| Slocum Hall |
| Smead, David, House |
| Smead House |
| Smith, Benjamin, House |
| Smith, Charles William and Anna, House |
| Smith, David, House |
| Smith-Davis House |
| Smith, Edward, Jr., Farm |
| Smith, Edwin, House |
| Smith-Jessup House |
| Smith, Samuel, House And Tannery |
| Smith, William, House |
| Smith, William R., House |
| Snow, John, House |
| Snow, Russ and Holland, Houses |
| Society for Savings Building |
| Soldiers' and Sailors' Memorial Chapel |
| Soldiers Memorial Parkway and McKinley Memorial Parkway |
| Sorrick-Oster Store |
| South Bass Island Light |
| South Crescent Arms, The |
| Southern Ohio Lunatic Asylum |
| South High Street Commercial Grouping |
| Southington Township School |
| South Lincoln Avenue Historic District |
| South Main Street District |
| South Park Historic District |
| South Ridge Schoolhouse |
| South Salem Academy |
| South Salem Covered Bridge |
| South School |
| Southworth House |
| Spacecraft Propulsion Research Facility |
| Spafford House |
| Speaker, Charles, House |
| Spencer's Landing |
| Spencer Town Hall |
| Spitler, Samuel, House |
| Spitzer Building |
| Sprague-Deaver House |
| Sprague House |
| Sprague, Jonathan, House |
| Spread Eagle Tavern-Conrey, James D., House |
| Springboro Historic District |
| Springdale |
| Spring Grove Cemetery |
| Spring Grove Cemetery Chapel |
| Squire's Glen Farm |
| St. Adalbert Polish Catholic Church |
| Stager-Beckwith House |
| Staley Farm |
| Staley, Mr. and Mrs. Karl A., House |
| St. Aloysius Catholic Church |
| St. Aloysius-on-the-Ohio |
| Stambaugh Building |
| Stambaugh, Henry H., Memorial Auditorium |
| Standart-Simmons Hardware Company |
| St. Andrew's Episcopal Church |
| Stanford, George, Farm |
| Stang, John, House |
| Stan Hywet Hall-Frank A. Seiberling House |
| Stan Hywet Poultry Keepers Cottage |
| St. Ann Roman Catholic Church Complex |
| St. Anthony Catholic Church, Padua |
| Stark County Courthouse and Annex |
| Starr, Horace C., House and Carriage Barns |
| Starr-Truscott House |
| State Theater |
| Station Road Bridge |
| St. Augustine Catholic Church |
| St. Augustine's Catholic Church |
| St. Bernard Catholic Church and Rectory |
| St. Bernard's Church |
| St. Boniface Roman Catholic Church, School, Rectory, and Convent of the Sister of the Precious Blood |
| St. Charles Seminary and Chapel |
| St. Clair Hospital |
| St. Clair Street Bridge |
| St. Clairsville Historic District |
| Steamboat Hotel |
| Stearns, Edward R., House |
| Stearns, William, House |
| Steele's Hill-Grafton Hill Historic District |
| Steindam House |
| St. Elizabeth's Magyar Roman Catholic Church |
Data from United States Park Service and Wikidata
