Connecticut - Role: Building
| Stapleton Building |
| Starr, C. J., Barn and Carriage House |
| Starr Mill |
| State Arsenal and Armory |
| State Park Supply Yard |
| St. Benedict's Church |
| Steamboat Dock Site |
| Steele, Allyn, House |
| Sterling Block-Bishop Arcade |
| Sterling Homestead |
| Sterling Opera House |
| Stevens, William, House |
| Steward's House, Foreign Mission School |
| Stick Style House at Stony Creek |
| St. James' Episcopal Church |
| St. John's Episcopal Church |
| St. John's Episcopal Church |
| St. John's Episcopal Church |
| St. John's Protestant Episcopal Church |
| St. Luke's Chapel |
| St. Luke's Episcopal Church |
| St. Mark’s Episcopal Church |
| St. Mary's Church |
| St. Mary's Parochial School |
| Stoddard, Capt. Mark, Farmstead |
| Stoeckel, Robbins, House |
| Stonington Harbor Lighthouse |
| Stonington High School |
| Stony Hill School |
| Stowe, Harriet Beecher, House |
| St. Paul's Methodist Episcopal Church |
| St. Peter's Episcopal Church |
| Strong House |
| Strouse, Adler Company Corset Factory |
| Sts. Cyril and Methodius Church |
| Sturges, Jonathan, House |
| Sturges-Wright House |
| Suburban Club |
| Sumner-Carpenter House |
| Sun Terrace |
| Swain-Harrison House |
| Swallen, James, House |
| Sweetland, Sophia, House |
| Swift, M. and Sons Company |
| System House |
| Tamarack Lodge Bungalow |
| Tarbell, Ida, House |
| Tarrywile |
| Tatum, Corinne and George Liston Jr., House |
| Taylor Memorial Library |
| Taylor's Corner |
| Telephone Exchange Building |
| Temple Beth Israel |
| Temple Beth Israel |
| Temple Beth Israel |
| Tephereth Israel Synagogue |
| Terry-Hayden House |
| Thames Shipyard |
| The Seaside |
| Thomaston Opera House |
| Thompson, William H., Farmstead |
| Thumb, Tom, House |
| Tiffany, Simon, House |
| Todd, Orrin, House |
| Tolland County Courthouse |
| Topsmead |
| Torrington Fire Department Headquarters |
| Town Farms Inn |
| Town Hall |
| Town Hall and District School No. 6 |
| Tranquility Farm |
| Treadway, Townsend G., House |
| Treadwell House |
| Trinity Church |
| Trinity Church |
| Trinity Church |
| Trinity Methodist Episcopal Church |
| Trumbull, John, Birthplace |
| Tully, William, House |
| Tunxis Forest Headquarters House |
| Tunxis Forest Ski Cabin |
| Tunxis Hose Firehouse |
| Turner, Dr. Philip, House |
| Tuttle, Bronson B., House |
| Twain, Mark, House |
| Tyler, John, House |
| Tyler, Solomon, House |
| Umpawaug District School |
| Uncasville School |
| Underwood Computing Machine Company Factory |
| Union Baptist Church |
| Union Church/St. Paul's Church |
| Union Depot |
| Union School |
| Union Society of Phoenixville House |
| Union Station |
| Unitarian Meetinghouse |
| Unitarian-Universalist Church |
| United Bank Building |
| United Congregational Church |
Data from United States Park Service and Wikidata
