Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| The Crooed Esses | Area | 325 | Litchfield | 41 47 53 N | 073 20 25 W |
| The Discovery Museum | Building | 76 | Fairfield | 41 12 54 N | 073 13 58 W |
| The Dock Shopping Center | Locale | 1 | Fairfield | 41 12 08 N | 073 06 45 W |
| The Epicure Shopping Center | Locale | 91 | Hartford | 41 41 47 N | 072 47 24 W |
| The Esplanade | Park | 14 | New Haven | 41 18 53 N | 072 55 29 W |
| The Exchange Shopping Mall Shopping Center | Locale | 109 | Hartford | 41 43 55 N | 072 48 01 W |
| The Farmington Library | Building | 75 | Hartford | 41 43 17 N | 072 49 45 W |
| The Forbes School | School | 191 | Litchfield | 41 48 46 N | 073 07 54 W |
| The Forman School | School | 336 | Litchfield | 41 45 32 N | 073 11 28 W |
| The Gables | Populated Place | 57 | Hartford | 41 56 39 N | 072 47 37 W |
| The Guilford Handcraft Center | School | 19 | New Haven | 41 18 03 N | 072 41 10 W |
| The Gulf | Bay | -3 | New Haven | 41 12 02 N | 073 02 59 W |
| The Gut | Bay | -3 | New London | 41 19 20 N | 072 10 37 W |
| The Gut | Gut | 4 | Fairfield | 41 02 43 N | 073 29 05 W |
| The Hartt School | Building | 18 | Hartford | 41 47 52 N | 072 42 51 W |
| The Hedgehog | Summit | 190 | Hartford | 41 52 57 N | 072 51 39 W |
| The Hogback | Ridge | 335 | Litchfield | 41 47 48 N | 073 19 45 W |
| The Hotchkiss School | School | 271 | Litchfield | 41 56 43 N | 073 26 20 W |
| The International School at Rogers Magnet | School | 6 | Fairfield | 41 03 11 N | 073 31 19 W |
| The Kissing Rocks | Pillar | 0 | New London | 41 20 54 N | 072 05 51 W |
| The Knolls | Range | 155 | Hartford | 41 55 40 N | 072 50 35 W |
| The Ledges | Bench | 31 | Middlesex | 41 18 01 N | 072 28 53 W |
| The Ledyard Oak | Locale | 94 | New London | 41 25 24 N | 072 03 01 W |
| The Levee | Building | 45 | Fairfield | 41 09 48 N | 073 15 23 W |
| The Lime Kiln | Island | 139 | Litchfield | 41 35 53 N | 073 26 39 W |
| The Little Red Schoolhouse | School | 382 | Litchfield | 41 53 20 N | 073 07 13 W |
| The Lower Lagoon | Lake | 1 | New London | 41 18 43 N | 072 00 34 W |
| The Mall at Bristol Centre Shopping Center | Locale | 94 | Hartford | 41 40 26 N | 072 56 43 W |
| The Market Place Shopping Center | Locale | 13 | Fairfield | 41 08 30 N | 073 21 40 W |
| The Meeting Place | Church | 266 | New Haven | 41 30 08 N | 072 58 42 W |
| The Morgan High School | School | 16 | Middlesex | 41 17 27 N | 072 31 44 W |
| The Museum | Building | 8 | New Haven | 41 18 20 N | 072 54 45 W |
| The Museum Laboratory School | School | 8 | New Haven | 41 18 20 N | 072 54 45 W |
| The Narrows | Channel | 137 | Litchfield | 41 33 09 N | 073 26 42 W |
| The Notch | Gap | 86 | Hartford | 41 58 52 N | 072 46 58 W |
| The Oyster River Shopping Center | Locale | 13 | Middlesex | 41 17 07 N | 072 24 55 W |
| The Parade | Park | 6 | New London | 41 21 13 N | 072 05 38 W |
| The Pinnacle | Pillar | 214 | Hartford | 41 51 58 N | 072 46 45 W |
| The Pinnacle | Pillar | 246 | Litchfield | 41 39 16 N | 073 18 48 W |
| The Pinnacle | Pillar | 385 | Litchfield | 41 42 10 N | 073 19 39 W |
| The Pinnacle | Summit | 502 | Litchfield | 41 49 15 N | 073 18 18 W |
| The Pinnacle | Summit | 278 | Tolland | 42 00 17 N | 072 24 26 W |
| The Plains | Flat | 47 | Middlesex | 41 36 54 N | 072 39 34 W |
| The Plans | Island | 4 | Fairfield | 41 03 10 N | 073 24 17 W |
| The Point | Cape | 1 | New London | 41 20 25 N | 071 58 44 W |
| The Public Library of New London | Building | 13 | New London | 41 21 16 N | 072 05 55 W |
| The Riding Way | Bridge | 1 | New London | 41 20 25 N | 071 57 38 W |
| The Sandy Desert | Flat | 8 | New London | 41 29 29 N | 072 05 25 W |
| The Shepherds Tent | Church | 6 | New London | 41 21 04 N | 072 06 08 W |
| The Shopping Center - Old Lyme Shopping Center | Locale | 11 | New London | 41 19 22 N | 072 20 05 W |
| The Spring-Life Church of God | Church | 4 | Fairfield | 41 02 56 N | 073 31 19 W |
| The Straits | Channel | -3 | Middlesex | 41 33 34 N | 072 35 57 W |
| The Sugarloaf | Summit | 162 | Hartford | 41 52 25 N | 072 51 57 W |
| The Tailings | Bar | 6 | New Haven | 41 15 25 N | 072 39 45 W |
| The Thimbles | Island | 5 | New Haven | 41 15 02 N | 072 45 15 W |
| The Upper Lagoon | Lake | 1 | New London | 41 18 41 N | 072 00 35 W |
| The Village | Locale | 26 | Fairfield | 41 09 26 N | 073 15 15 W |
| The Village Square Shopping Center | Locale | 134 | Fairfield | 41 24 16 N | 073 17 54 W |
| The Wales | Locale | 127 | New London | 41 31 07 N | 072 16 08 W |
| The William Pitt Child Development Center | School | | Fairfield | 41 03 48 N | 073 31 38 W |
| Theal Bridge | Bridge | 2 | Fairfield | 41 03 17 N | 073 32 37 W |
| Theims Brook | Stream | | Tolland | 41 43 55 N | 072 18 56 W |
| Theriaults Ice Pond | Lake | 175 | New Haven | 41 33 45 N | 072 57 51 W |
| Thimble Island Harbor | Bay | 0 | New Haven | 41 14 57 N | 072 45 13 W |
| Third Baptist Church | Church | 41 | Hartford | 41 58 26 N | 072 38 51 W |
| Third Baptist Church | Church | 49 | New London | 41 26 22 N | 071 52 48 W |
| Third Bay | Bay | 268 | Litchfield | 41 53 46 N | 073 05 32 W |
| Third Congregational Church | Church | 61 | Middlesex | 41 34 52 N | 072 42 19 W |
| Thirsty Lake | Lake | 25 | New Haven | 41 18 46 N | 072 41 41 W |
| Thistle Island | Island | 129 | Fairfield | 41 33 26 N | 073 28 50 W |
| Thody Pond | Lake | 104 | New Haven | 41 25 51 N | 072 42 19 W |
| Thomas F Dolan Commons | Locale | 50 | Fairfield | 41 09 57 N | 073 15 35 W |
| Thomas G Alcorn Elementary School | School | 56 | Hartford | 41 59 14 N | 072 35 29 W |
| Thomas G Alcorn School | School | 41 | Hartford | 41 59 37 N | 072 35 41 W |
| Thomas Hooker School | School | 102 | New Haven | 41 31 02 N | 072 46 44 W |
| Thomas J Hyland Memorial Park | Park | 49 | Hartford | 41 44 18 N | 072 41 41 W |
| Thomas J McDonough School | School | 28 | Middlesex | 41 44 58 N | 072 41 54 W |
| Thomas J Walsh Art Gallery | Building | 42 | Fairfield | 41 09 24 N | 073 15 27 W |
| Thomas Jefferson Branch New Britain Public Library | Building | 111 | Hartford | 41 41 40 N | 072 47 56 W |
| Thomas Kelly Junior High School | School | 89 | New London | 41 32 49 N | 072 04 43 W |
| Thomas Lee House | Building | 9 | New London | 41 19 03 N | 072 14 18 W |
| Thomas Mountain | Summit | 268 | Fairfield | 41 21 58 N | 073 27 25 W |
| Thomas Tquiri Middle School | School | 26 | Hartford | 41 46 30 N | 072 40 55 W |
| Thomas W Mahan School | School | 21 | New London | 41 30 36 N | 072 06 43 W |
| Thomaston | Populated Place | 123 | Litchfield | 41 40 26 N | 073 04 23 W |
| Thomaston Dam | Dam | 134 | Litchfield | 41 41 41 N | 073 03 44 W |
| Thompson | Populated Place | 182 | Windham | 41 57 31 N | 071 51 45 W |
| Thompson Brook | Stream | | Hartford | 41 46 12 N | 072 49 28 W |
| Thompson Brook | Stream | | Hartford | 41 55 51 N | 072 31 04 W |
| Thompson Brook | Stream | | New London | 41 23 51 N | 072 02 29 W |
| Thompson Corner (historical) | Populated Place | 10 | New Haven | 41 16 36 N | 072 52 23 W |
| Thompson Green | Park | 179 | Windham | 41 57 30 N | 071 51 47 W |
| Thompson Hill | Summit | 120 | Hartford | 41 47 09 N | 072 50 53 W |
| Thompson Hill | Summit | 179 | Windham | 41 57 30 N | 071 51 48 W |
| Thompson Hill Fire Company | Building | 167 | Windham | 41 57 19 N | 071 51 36 W |
| Thompson Meadows | Swamp | 164 | Windham | 41 57 32 N | 071 51 18 W |
| Thompson Middle School | School | 125 | Windham | 41 58 35 N | 071 53 51 W |
| Thompson Pond | Lake | 54 | Tolland | 41 56 04 N | 072 30 39 W |
| Thompson Post Office | Post Office | 181 | Windham | 41 57 35 N | 071 51 49 W |
| Thompson Public Library | Building | 111 | Windham | 41 59 04 N | 071 53 48 W |
| Thompson Raceway | Locale | 134 | Windham | 41 58 57 N | 071 49 28 W |
| Thompsonville | Populated Place | 35 | Hartford | 41 59 49 N | 072 35 56 W |
| Thompsonville Town Hall | Building | 34 | Hartford | 42 00 02 N | 072 35 39 W |
| Thomson Bridge | Bridge | 6 | New Haven | 41 18 37 N | 072 57 22 W |
| Thorne Brook | Stream | | Hartford | 41 59 15 N | 073 01 06 W |
| Thornton Brook | Stream | | Tolland | 41 43 30 N | 072 17 06 W |
| Thorpe Mountain | Summit | 518 | Litchfield | 41 59 26 N | 073 29 15 W |
| Thousand Acre Pond | Lake | 130 | New London | 41 31 48 N | 072 22 41 W |
| Thralltown | Populated Place | 28 | Hartford | 41 52 56 N | 072 39 17 W |
| Thrasher Brook | Stream | | Tolland | 42 00 27 N | 072 27 36 W |