Massachusetts - Criteria: C (architecture/engineering)
| Trinity Episcopal Church |
| Trinity Neighborhood House |
| Trinity Rectory |
| Troupes, John, Three-Decker |
| Trowbridge-Badger House |
| Truesdale Hospital |
| Truman Parkway-Metropolitan Park System of Greater Boston |
| Truro Highlands Historic District |
| Tucker, Dr. Harrison A., Cottage |
| Tucker Farm Historic District |
| Tuckerman, William F., House |
| Tufts, Peter and Oliver, House |
| Tufts, Peter, House |
| Tufts, Rev. John, House |
| Turnbull, R.P., House |
| Turner Falls Historic District |
| Turner Hill |
| Turner, Stephen, House |
| Turnpike House |
| Tuttle Square School |
| Twinehurst American Optical Company Neighborhood |
| Twin Lights Historic District-Cape Ann Light Station |
| Twitchell, Ginery, House |
| Twitchell, Joseph, House |
| Two Brothers Rocks-Dudley Road Historic District |
| Tyler, Frank J., House |
| Tyler Park Historic District |
| Tyng, Col. Jonathan, House |
| Tyringham Cemetery |
| Tyringham Library |
| Tyringham Shaker Settlement Historic District |
| Union Baptist Church |
| Union Chapel |
| Union Congregational Church |
| Union Congregational Church |
| Union Hall |
| Union Mills |
| Union Mission Chapel-Historical Hall |
| Union Oyster House |
| Union Station |
| Union Station |
| Union Station |
| Union Station |
| Union Street Historic District |
| Union Trust Company Building |
| Union Wharf |
| Unitarian Memorial Church |
| Unitarian Society, The |
| Unitarian Universalist Church and Parsonage |
| United Electric Co. Building |
| United First Parish Church (Unitarian) of Quincy |
| United Shoe Machinery Corporation Building |
| United Shoe Machinery Corporation Clubhouse |
| United State Post Office, Courthouse, and Federal Building |
| United States Watch Company |
| United States Whip Company Complex |
| Universalist Society Meetinghouse |
| University Hall, Harvard University |
| Upham, Phineas, House |
| Upham's Corner Market |
| Upper Chapin Street Historic District |
| Upper Historic District |
| Upper Magazine Street Historic District |
| Upper Main Street Historic District |
| Upper North Street Commercial District |
| Upper Worthington Historic District |
| Upsala Street School |
| Upton Center Historic District |
| Upton Town Hall |
| Urban Rowhouse |
| Urban Rowhouse |
| Urban Rowhouse |
| U.S. Customhouse |
| US Customhouse |
| U.S. Customshouse |
| US Post Office |
| U.S. Post Office and Courthouse |
| US Post Office-Arlington Main |
| US Post Office-Attleboro Main |
| US Post Office-Beverly Main |
| US Post Office-Central Square |
| US Post Office-Easthampton Main |
| US Post Office Garage |
| US Post Office-Great Barrington Main |
| US Post Office-Greenfield Main |
| US Post Office-Holyoke Main |
| US Post Office-Lexington Main |
| US Post Office-Lynn Main |
| US Post Office-Medford Main |
| US Post Office-Middleborough Main |
| US Post Office-Millbury Main |
| US Post Office-Milton Main |
| US Post Office-Newburyport Main |
| US Post Office-Palmer Main |
| US Post Office-Provincetown Main |
| US Post Office-Quincy Main |
| US Post Office-Salem Main |
| US Post Office-Somerville Main |
| US Post Office-South Hadley Main |
| US Post Office-Taunton Main |
Data from United States Park Service and Wikidata
