All - Architectural style - Federal architecture
| Sullivan County Courthouse |
| Sullivan House |
| Summit Plantation House |
| Sumner-Carpenter House |
| Sumner, Charles, House |
| Sunnyfields |
| Sunnyside |
| Sunnyside |
| Surratt House |
| Surratt, Mary E., House |
| Surry Town Hall |
| Sutfield-Thompson House |
| Suttle, Joseph, House |
| Sutton-Chapman-Howland House |
| Sutton House |
| Swan Pond |
| Swansbury |
| Swart House and Tavern |
| Sweetser, Daniel, House |
| Swetland-Pease House |
| Swift-Kinsman House |
| Swift, Philetus, House |
| Symington House |
| Symonds, Thomas, House |
| Tabb, Edward, House |
| Tabor-Wing House |
| Taft, George, House |
| Talbot Hall |
| Tanner, John, House |
| Tappan-Viles House |
| Taveau Church |
| Tavenner House |
| Tavern Farm, Old |
| Tavern on Mutton Hill |
| Tay, Jesse, House |
| Taylor, Isaac, House |
| Taylor-Whittle House |
| Tears, John, Inn |
| Telford, Thomas, House |
| Temple Hall |
| Ten Broeck, Jacob, Stone House |
| Tenney Homestead |
| Terhune-Gardner-Lindenmeyr House |
| Terra Rubra |
| Terry-Ketcham Inn |
| Terwilliger House |
| Teviotdale |
| Thacher-Goodale House |
| Thatcher, Henry Knox, House |
| Thayer, Benjamin, House |
| The Locusts |
| The Rectory |
| Thomas, David W., House |
| Thomas, Dr. Nathan M., House |
| Thomas House |
| Thomas, Jack, House |
| Thomas Mill and Miller's House |
| Thomas-Wiley-Abbott Farmstead |
| Thompson, Alexander, House |
| Thompson, Andrew, Farmstead |
| Thompson-Brown-Sandusky House |
| Thompson Farm |
| Thompson, Jacob, House |
| Thompson, Robert A., House |
| Thomson, Gen. David, House |
| Thoreau-Alcott House |
| Thorndale |
| Thornton, Dr. Richard, House |
| Three Mile Tollhouse |
| Tiffany, Simon, House |
| Tilton, D. Horace, House |
| Tinsley Tavern |
| Tobey Homestead |
| Todd, Orrin, House |
| Tomlinson House |
| Tontine Building |
| Toombs, Robert, House |
| Toombs Tobacco Farm |
| Tower, Lewis, House |
| Town Farms Inn |
| Townfield |
| Townsend House |
| Treat, Nathaniel, House |
| Trenton |
| Trimble, George, House |
| Trimmer-Dufford Farmstead |
| Trinity Church |
| Trinity Church |
| Trinity Episcopal Church |
| Trinity Episcopal Church-Fairfield |
| Trinity Methodist Church |
| Tripp Family Homestead |
| Trousdale-Baskerville House |
| Trowbridge, Charles, House |
| Tucker, John, House |
| Tudor Place |
| Tufts House |
| Tuleyries, The |
| Tupper-Barnett House |
| Turtle House |
Data from United States Park Service and Wikidata
