Maine - Criteria: A (event)
| Stonington Opera House |
| St. Patrick's Catholic Church |
| Strand Theatre |
| Strathglass Building |
| Strathglass Park District |
| Stroudwater Historic District |
| Sturtevant Hall |
| Sunday River Bridge |
| Surry Town Hall |
| Swan Island Historic District |
| Swedish Lutheran Church |
| Tate House |
| Temple Intervale School |
| Temple, The |
| Tenants Harbor Light Station |
| The Birches |
| """The Rim"" and Site of Fort Foster" |
| Thompson Icehouse |
| Thompson's Bridge |
| Timmerhuset |
| Todd House |
| Togus VA Medical Center and National Cemetery |
| Topsham Fairgrounds Grandstand |
| Tracy-Causer Block |
| Tramway Historic District |
| Tranquility Grange No. 344 |
| Trufant Historic District |
| Tufts House |
| Turner Cattle Pound |
| Turner Town House |
| Turrets, The |
| Two Cent Bridge |
| Two Lights |
| Ulmer, George, House |
| Union Church |
| Union Church, (former) |
| Union Hall |
| Union Hotel |
| Union Meeting House, (Former) |
| Union School |
| Union School |
| Union Town House (Former) |
| Upper Dallas School |
| Upton Grange No. 404 (Former) |
| U.S. Courthouse |
| U.S. Customhouse |
| U.S. Customhouse and Post Office |
| U.S. Inspection Station-Calais (Ferry Point), Maine |
| U.S. Inspection Station-Fort Fairfield, Maine |
| U.S. Inspection Station-Orient, Maine |
| U.S. Post Office |
| Valley Lodge |
| Vaughan Homestead |
| VICTORY CHIMES (Schooner) |
| Village School |
| Vinalhaven Galamander, The |
| Vinalhaven Public Library |
| Wadsworth Hall |
| Waldoborough Town Pound |
| Walker Memorial Hall |
| Walker Memorial Library |
| Wallace-Haskell Homestead |
| Washington County Courthouse |
| Waterboro Grange, No. 432 |
| Water Street |
| Waterville High School |
| Waterville Main Street Historic District |
| Waterville Opera House and City Hall |
| Watkins House and Cabins |
| Watson, John, House |
| Wayne Town House |
| Way Way General Store |
| Webster Grammar School |
| Webster, Moses, House |
| Weld Town Hall |
| Wells Baptist Church Parsonage |
| Wells Homestead |
| Westbrook College Historic District |
| Westbrook High School |
| West Gouldsboro Village Library |
| West Market Square Historic District |
| Weston, Daniel, Homestead |
| Weston Homestead |
| West Paris Lodge No. 15, I.O.O.F. |
| West Quoddy Head Light Station |
| West Quoddy Lifesaving Station |
| West Street Historic District |
| Whaleback Light Station |
| Wheelwright Block |
| Whitefield Union Hall |
| Whitehead Lifesaving Station |
| Whitehead Light Station |
| White Memorial Building |
| Whitlocks Mill Light Station |
| Whitman Memorial Library |
| Whitney, Capt. Joel, House |
| Whitney Farm |
| Whitney Park Historic District |
| Williams, Gen. John, House |
| Williston-West Church and Parish House |
Data from United States Park Service and Wikidata
