Ohio - Criteria: A (event)
| Soldiers Memorial Parkway and McKinley Memorial Parkway |
| Sorrick-Oster Store |
| South Bass Island Light |
| South Crescent Arms, The |
| Southern Ohio Lunatic Asylum |
| Southern Park Stable |
| South High Street Commercial Grouping |
| Southington Township School |
| South Leroy Meetinghouse |
| South Newbury Union Chapel |
| South Park Historic District |
| South Ridge Schoolhouse |
| South Salem Academy |
| South School |
| Spacecraft Propulsion Research Facility |
| Spang, J., Baking Company |
| Sprague, Jonathan, House |
| Springboro Historic District |
| Springfield Metallic Casket Company |
| St. Adalbert Polish Catholic Church |
| Stager-Beckwith House |
| Stahl-Hoagland House |
| Staley Farm |
| St. Aloysius Orphanage |
| Stambaugh Building |
| Stambaugh, Henry H., Memorial Auditorium |
| Stanford, George, Farm |
| Stan Hywet Hall-Frank A. Seiberling House |
| Stark County Courthouse and Annex |
| Starr, Horace C., House and Carriage Barns |
| Starr-Truscott House |
| State Theater |
| St. Boniface Roman Catholic Church, School, Rectory, and Convent of the Sister of the Precious Blood |
| St. Clair Hospital |
| St. Clair Street Bridge |
| St. Clairsville Historic District |
| Steamboat Hotel |
| Stearns, Lyman, Farm |
| Stebbens Farm |
| Steele's Hill-Grafton Hill Historic District |
| St. Elizabeth's Magyar Roman Catholic Church |
| Steubenville Commercial Historic District |
| Steubenville Pottery Company Buildings |
| Steubenville YMCA Building |
| St. Francis Catholic Church and Rectory |
| St. Francis De Sales Church Historic District |
| St. Francis Hospital |
| St. Francis Xavier Church |
| St. Henry Catholic Church |
| St. Henry Roman Catholic Church and Rectory |
| St. Ignatius High School |
| Stivers High School |
| St. James Episcopal Church |
| St. James Episcopal Church |
| St. John's Episcopal Church |
| St. John's Episcopal Church |
| St. John's Episcopal Church |
| St. John's Lutheran Church |
| St. John The Baptist Roman Catholic Church |
| St. Joseph Catholic Church and Rectory |
| St. Joseph Catholic Church and School |
| St. Joseph Convent and Academy Complex |
| St. Joseph's Church and Friary |
| St. Luke's Hospital |
| St. Mary's Catholic Church |
| St. Mary's Church of the Immaculate Conception |
| St. Mary's Of Morges |
| St. Mary's Rectory |
| St. Mary's School |
| St. Michael Catholic Church Complex |
| St. Michael the Archangel Catholic Church |
| St. Nicholas Catholic Church and Rectory |
| Stokes, Benjamin A., House |
| St. Patrick's Catholic Church |
| St. Patrick's Catholic Church |
| St. Paul AME Church |
| St. Paul Church Historic District |
| St. Paul's Catholic Church and Rectory |
| St. Paul's Sunday School and Parish House |
| St. Peter Evangelical Lutheran Church |
| St. Peter-In-Chains Cathedral |
| St. Peter's Lick Run Historic District |
| Stratford Methodist Episcopal Church |
| Strongsville Town Hall |
| St. Rosa Church |
| Strouss-Hirschberg Company |
| Stryker Depot |
| Sts. Peter & Paul Church and Rectory |
| St. Stanislaus Church |
| St. Stephen Church and Rectory |
| St.Stephens' AME Church |
| St. Theodosius Russian Orthodox Cathedral |
| St. Thomas Aquinas Church |
| Stuart's Opera House |
| Stumpy Basin |
| Stuyvesant Hall |
| Stuyvesant Motor Company Building |
| Succesful Sales |
| Superior Avenue Viaduct |
| Swift-Kinsman House |
Data from United States Park Service and Wikidata
