Ohio - Area of significance: Social History
| Stager-Beckwith House |
| St. Aloysius Orphanage |
| Stan Hywet Hall-Frank A. Seiberling House |
| Stanton Farm |
| Starr, Horace C., House and Carriage Barns |
| Starr-Truscott House |
| St. Clair Hospital |
| St. Clairsville Historic District |
| Stengel, John S., House |
| Steubenville YMCA Building |
| St. Francis Catholic Church and Rectory |
| St. Francis Hospital |
| St. Henry Catholic Church |
| St. Michael Catholic Church Complex |
| St. Michael the Archangel Catholic Church |
| St. Nicholas Catholic Church and Rectory |
| Stockbridge Apartment Building |
| Stowe, Harriet Beecher, House |
| St. Paul AME Church |
| Strongsville Town Hall |
| St. Stanislaus Church |
| St.Stephens' AME Church |
| St. Theodosius Russian Orthodox Cathedral |
| Sunday Creek Coal Company Mine No. 6 |
| Tawawa Chimney Corner |
| Taylor Mansion-Lakehurst |
| Temperance Row Historic District |
| Temple and Masonic Block Buildings |
| Temple, The |
| The Ridge |
| Thomas, Dr. Kersey G., House and Office |
| Thompson-Builder House |
| Thornton-Guise Kitchen And House |
| Toledo Club |
| Toledo Yacht Club |
| Town Center District |
| Town Pump of East Sparta, The |
| Tremaine-Gallagher Residence |
| Twin Oaks |
| Union Baptist Cemetery |
| Union Chapel |
| Uniopolis Town Hall |
| United Brethren Publishing House |
| United Colored American Cemetery |
| United Methodist Church |
| University Club |
| Upton, Harriet Taylor, House |
| Vistula Historic District |
| Von Schulenburg, Ernst, House |
| Wadsworth, Frederick, House |
| Wagnalls Memorial |
| Warren, Moses, House |
| Warren Public Library |
| Warsaw Hotel |
| Warszawa Neighborhood District |
| Washington Avenue Historic District |
| Washington Township Voting Hall |
| Waterstreet Historic District |
| Wellington Center Historic District |
| Wellington Historic District |
| Wesley Chapel |
| Westbrock Funeral Home |
| Westerly Apartments |
| West Main Street District |
| West Union Presbyterian Church |
| Whallon, James, House |
| Wheatley, Phillis, Association |
| Whitewater Shaker Settlement |
| Whitmer, Frieda, House |
| Whitney, George W., House |
| WHK Studio One |
| Wick Avenue Historic District |
| Wilcox, Jacob, Farm |
| Williams, Dr. Issac Elmer, House And Office |
| Wilson, John T., Homestead |
| Wilson, Samuel and Sally, House |
| Windsor Corners District |
| Women's Christian Association |
| Wood County Home and Infirmary |
| Woodland Cemetery |
| Woodland Cemetery Association of Dayton Historic District |
| Wright, Dr. John A., House |
| Wyandot Mission Church |
| Wyatt's Tavern-Fort Morrow Site |
| Yellow Springs Historic District |
| YMCA |
| Young Women's Christian Association of Cincinnati |
| YWCA Building |
| Zanesville YWCA |
| Zimmerly House |
| Zimmerman, Ezekiel B., Octagon House |
| Zoar Historic District |
Data from United States Park Service and Wikidata
