Delaware - Criteria: A (event)
| St. Anthony's Roman Catholic Church |
| Star Hill AME Church |
| STATE OF PENNSYLVANIA (steamboat) |
| State Theater |
| Stewart, James, House |
| St. George's Chapel |
| St. Hedwig's Roman Catholic Church |
| Stinson, J., Farm |
| St. Joseph's Catholic Church |
| St. Joseph's Industrial School |
| St. Mary of the Immaculate Conception Church |
| St. Mary's School |
| St. Nicholas Ukrainian Catholic Church |
| St. Paul A.M.E. Church |
| St. Paul's Episcopal Church |
| Strand Millas and Rock Spring |
| Sudler House |
| Sussex County Courthouse and the Circle |
| Sutton, Thomas, House |
| Talley, William, House |
| Tatnall, Joseph, House |
| Taylor's Bridge School |
| Teddy's Tavern |
| Thomas, David W., House |
| Torbert Street Livery Stables |
| Townsend Historic District |
| Trinity Methodist Episcopal Church |
| Union Wesley Methodist Episcopal Church Complex |
| U.S. Post Office, Courthouse, and Customhouse |
| Vail, A. M., House |
| Vandegrift, J., House |
| Vandyke-Heath House |
| Vansant, John C., House |
| Victorian Dover Historic District |
| Village of Arden |
| Walker's Mill and Walker's Bank |
| Walnut Green School |
| Warren's Mill |
| Water Witch Steam Fire Engine Company No. 5 |
| Wawaset Park Historic District |
| Weldin, Lewis, House |
| West 9th Street Commercial Historic District |
| Weston |
| West Potato House |
| White Hall |
| White-Warren Tenant House |
| Wilkerson, J. H., & Son Brickworks |
| Williams House |
| Williams, J. K., House |
| Wilmington Amtrak Station |
| Wilmington and Western Railroad |
| Wilmington Club |
| Wilmington Rail Viaduct |
| Wilmington YMCA |
| Windsor |
| Winterthur Museum and Gardens |
| Woman's Christian Temperance Union Fountain |
| Woman's Club of Newport |
| Wooddale Bridge |
| Wooddale Historic District |
| Woodside |
| Woodstock |
| Wright Potato House |
| Wright, Warren T., Farmhouse Site |
| Wyoming Historic District |
| Wyoming Railroad Station |
| Young, William, House |
| Zion African Methodist Episcopal Church |
Data from United States Park Service and Wikidata
