New York - Criteria: C (architecture/engineering)
| The Woodpile |
| Third Judicial District Courthouse |
| Third National Bank |
| Third Ward Historic District |
| Thirty Mile Point Light |
| Thomas Indian School |
| Thomas Memorial AME Zion Church |
| Thomas-Wiley-Abbott Farmstead |
| Thompson, Alexander, House |
| Thompson, Andrew, Farmstead |
| Thompson, Henry Dwight, House |
| Thompson House |
| Thompson House |
| Thompson, Robert A., House |
| Thompson, Walter, House and Carriage House |
| Thompson, W. B., Mansion |
| Thomson Family Farm |
| Thornden Park |
| Thorne Memorial School |
| Thousand Island Grange Hall |
| Thousand Island Park Historic District |
| Three Mile Bay Historic District |
| Three Squares Historic District |
| Tianderah |
| Tibbetts Point Light |
| Tibbetts-Rumsey House |
| Tibbits House |
| Ticonderoga High School |
| Ticonderoga National Bank |
| Ticonderoga Pulp and Paper Company Office |
| Tiffany and Company Building |
| Tilden, Gov. Samuel J., Monument |
| Tilden, Samuel J., House |
| Times Square-42nd Street Subway Station |
| Times Square Hotel |
| Tinker Cobblestone Farmstead |
| Tioga Centre General Store |
| Tioga County Courthouse |
| Tioronda Bridge |
| Tishman Building |
| Titus-Bunce House |
| Titus, Elias, House |
| Titus, Willet, House |
| Todd, Hiram Charles, House |
| Toll Gate House |
| Tomlinson House |
| Tompkins Corners United Methodist Church |
| Tompkins Street Historic District |
| Tonawanda (25th Separate Company) Armory |
| Tonawanda Municipal Building |
| Torne Brook Farm |
| Torry-Chittendon Farmhouse |
| Tousey, Benjamin C., House |
| Tousley-Church House |
| Towar-Ennis Farmhouse and Barn Complex |
| Tower Homestead and Masonic Temple |
| Town and Country Building |
| Town Doctors' House and Site |
| Town Hall |
| Town-Hollister Farm |
| Townhouses at 352 and 353 Riverside Dr. |
| Town Line Bridge |
| Town Linke Church and Cemetery |
| Town of Niagara District School No. 2 |
| Townsend, Henry, House |
| Tracy Farm |
| Tracy Memorial Village Hall Complex |
| Trans World Airlines Flight Center |
| Traver House |
| Traver, J. E., Farm |
| Traver, John H., Farm |
| Travis House |
| Treemont Manor |
| Tremont Baptist Church |
| Trevor, John Bond, House |
| Trico Plant No. 1 |
| Trimble, George, House |
| Trinity Chapel |
| Trinity Chapel Complex |
| Trinity Church |
| Trinity Church |
| Trinity Church |
| Trinity Church and Graveyard |
| Trinity Church Complex |
| Trinity Church Lansingburgh |
| Trinity Episcopal Chapel |
| Trinity Episcopal Church |
| Trinity Episcopal Church |
| Trinity Episcopal Church |
| Trinity Episcopal Church |
| Trinity Episcopal Church |
| Trinity Episcopal Church and Parish House |
| Trinity Episcopal Church Complex |
| Trinity Episcopal Church Complex |
| Trinity Episcopal Church-Fairfield |
| Trinity Lutheran Church |
| Trinity Lutheran Church and Cemetery |
| Trinity Lutheran Church of Manhattan |
| Trinity Memorial Church |
| Trinity Methodist Church |
Data from United States Park Service and Wikidata
