Maine - Role: Building
| Swedish Lutheran Church |
| Symphony House |
| Talbot, James R., House |
| Tappan-Viles House |
| Tarr-Eaton House |
| Tarr, John, House |
| Tate House |
| Temple Intervale School |
| Temple, The |
| Thacher-Goodale House |
| Thatcher, Henry Knox, House |
| The Birches |
| Thomas B. Reed School |
| Thompson Block |
| Thompson Icehouse |
| Thorndike, George, House |
| Tiffany Chapel |
| Tiffany, George S., Cottage |
| Tillson Farm Barn |
| Tillson, Gen. Davis, House |
| Timmerhuset |
| Todd House |
| Topside |
| Tracy-Causer Block |
| Traip, Robert and Louisa, House |
| Tranquility Grange No. 344 |
| Treat, Nathaniel, House |
| Trefethen-Evergreen Improvement Association |
| Trinity Episcopal Church |
| Troy Meeting House |
| Tufts House |
| Turner Town House |
| Turrets, The |
| Ulmer, George, House |
| Underwood, Joseph H., House |
| Union Block |
| Union Church |
| Union Church |
| Union Church |
| Union Church |
| Union Church |
| Union Church |
| Union Church, (former) |
| Union Church of Northeast Harbor |
| Union Church of Vinalhaven |
| Union Evangelical Church |
| Union Hall |
| Union Hall |
| Union Hotel |
| Union Meeting House |
| Union Meeting House, (Appleton) |
| Union Meeting House, (Former) |
| Union School |
| Union School |
| Union Town House (Former) |
| Unitarian Church of Houlton |
| United Baptist Church |
| Universalist Meeting House |
| Universalist-Unitarian Church |
| Upper Dallas School |
| Upton Grange No. 404 (Former) |
| U.S. Courthouse |
| U.S. Customhouse |
| U.S. Customhouse |
| U.S. Customhouse and Post Office |
| U.S. Customhouse and Post Office |
| U.S. Customhouse (Old Customhouse) and Post Office |
| U.S. Inspection Station-Calais (Ferry Point), Maine |
| U.S. Inspection Station-Coburn Gore, Maine |
| U.S. Inspection Station-Fort Fairfield, Maine |
| U.S. Inspection Station-Limestone, Maine |
| U.S. Inspection Station-Orient, Maine |
| U.S. Naval Radio Station-Apartment Building and Power House |
| U.S. Post Office |
| US Post Office-Bar Harbor Main |
| US Post Office-Camden Main |
| US Post Office-Lewiston Main |
| US Post Office-Old Town Main |
| US Post Office-Orono Main |
| US Post Office-Portland Main |
| US Post Office-Presque Isle Main |
| US Post Office-Sanford Main |
| Vallee Family House |
| Valley Lodge |
| Vaughan Homestead |
| Veazie, Jones P., House |
| Vickery Building |
| Vienna Town House |
| Village School |
| Village School at Puddle Dock |
| Vinalhaven Public Library |
| Wadsworth Hall |
| Wadsworth-Longfellow House |
| Waldo Theatre |
| Wales and Hamblen Store |
| Walker Memorial Hall |
| Walker Memorial Library |
| Wallace, Everett, House |
| Wallingford Hall |
| Walpole Meetinghouse |
Data from United States Park Service and Wikidata
