Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Trinity Church | Church | 153 | Baltimore | 39 27 47 N | 076 31 41 W |
| Trinity Church | Church | 18 | Caroline | 38 56 25 N | 075 53 08 W |
| Trinity Church | Church | 267 | Carroll | 39 30 53 N | 076 57 50 W |
| Trinity Church | Church | 112 | Cecil | 39 40 48 N | 075 58 52 W |
| Trinity Church | Church | 49 | Charles | 38 27 00 N | 076 51 53 W |
| Trinity Church | Church | 0 | Dorchester | 38 30 14 N | 076 09 58 W |
| Trinity Church | Church | 830 | Garrett | 39 38 17 N | 079 06 18 W |
| Trinity Church | Church | 45 | Harford | 39 26 22 N | 076 20 24 W |
| Trinity Church | Church | 1 | Somerset | 38 02 27 N | 075 46 21 W |
| Trinity Church | Church | 29 | St. Mary's | 38 15 37 N | 076 27 32 W |
| Trinity Church | Church | 5 | Worcester | 38 03 39 N | 075 35 56 W |
| Trinity Church Dam | Dam | 16 | Charles | 38 27 30 N | 076 51 29 W |
| Trinity Church of God | Church | 167 | Washington | 39 39 19 N | 077 55 48 W |
| Trinity Church of God | Church | 178 | Washington | 39 30 33 N | 077 38 55 W |
| Trinity Church of the Brethren | Church | 117 | Baltimore (city) | 39 20 50 N | 076 38 08 W |
| Trinity Church of the Nazarene | Church | 70 | Prince George's | 38 45 38 N | 076 57 31 W |
| Trinity Church Run | Stream | | Charles | 38 27 37 N | 076 52 03 W |
| Trinity Episcopal Church | Church | 145 | Baltimore | 39 24 08 N | 076 36 22 W |
| Trinity Episcopal Church | Church | 8 | Cecil | 39 36 24 N | 075 49 56 W |
| Trinity Episcopal Church | Church | 62 | Howard | 39 10 48 N | 076 46 13 W |
| Trinity Episcopal Church | Church | 12 | Prince George's | 38 48 52 N | 076 45 12 W |
| Trinity Episcopal Church | Church | 4 | St. Mary's | 38 11 15 N | 076 26 06 W |
| Trinity Evangelical and Reformed Church | Church | 96 | Frederick | 39 18 34 N | 077 28 25 W |
| Trinity Evangelical Lutheran Church | Church | 192 | Allegany | 39 39 23 N | 078 46 03 W |
| Trinity Evangelical Lutheran Church | Church | 177 | Washington | 39 38 44 N | 077 43 02 W |
| Trinity Evangelical United Brethren Church | Church | 54 | Baltimore (city) | 39 18 58 N | 076 34 37 W |
| Trinity Farms | Populated Place | 12 | Anne Arundel | 39 04 22 N | 076 32 24 W |
| Trinity Full Gospel Church | Church | 180 | Washington | 39 41 59 N | 078 10 10 W |
| Trinity Gardens Cemetery | Cemetery | 9 | Worcester | 38 15 04 N | 075 17 17 W |
| Trinity Graveyard | Cemetery | 237 | Washington | 39 39 21 N | 077 34 23 W |
| Trinity Lake | Reservoir | 25 | Charles | 38 27 11 N | 076 50 48 W |
| Trinity Lutheran Church | Church | 24 | Baltimore (city) | 39 17 52 N | 076 34 58 W |
| Trinity Lutheran Church | Church | 20 | Kent | 39 13 14 N | 076 03 60 W |
| Trinity Lutheran Church | Church | 117 | Montgomery | 39 02 18 N | 077 07 26 W |
| Trinity Lutheran Church | Church | 33 | Prince George's | 38 56 18 N | 076 57 57 W |
| Trinity Lutheran Church | Church | 170 | Washington | 39 30 17 N | 077 39 07 W |
| Trinity Lutheran Church | Church | 239 | Washington | 39 39 20 N | 077 34 24 W |
| Trinity Lutheran Church (historical) | Church | 157 | Carroll | 39 39 43 N | 077 10 32 W |
| Trinity Memorial Gardens | Cemetery | 61 | Charles | 38 37 33 N | 076 52 36 W |
| Trinity Methodist Church | Church | 16 | Caroline | 39 02 03 N | 075 47 17 W |
| Trinity Methodist Church | Church | 16 | Caroline | 39 02 03 N | 075 47 16 W |
| Trinity Presbyterian Church | Church | 88 | Baltimore (city) | 39 18 36 N | 076 40 17 W |
| Trinity Reformed United Church of Christ | Church | 162 | Washington | 39 30 22 N | 077 39 15 W |
| Trinity School | School | 112 | Howard | 39 13 42 N | 076 45 52 W |
| Trinity Tabernacle Church of God | Church | 12 | Wicomico | 38 23 31 N | 075 37 28 W |
| Trinity United Church of Christ | Church | 72 | Baltimore (city) | 39 19 51 N | 076 38 10 W |
| Trinity United Church of Christ | Church | 301 | Carroll | 39 39 42 N | 076 53 01 W |
| Trinity United Church of Christ | Church | 152 | Frederick | 39 37 23 N | 077 24 32 W |
| Trinity United Methodist Church | Church | 218 | Allegany | 39 38 12 N | 078 45 38 W |
| Trinity United Methodist Church | Church | 13 | Anne Arundel | 38 58 41 N | 076 30 50 W |
| Trinity United Methodist Church | Church | 25 | Anne Arundel | 39 03 07 N | 076 44 09 W |
| Trinity United Methodist Church | Church | 145 | Baltimore | 39 16 48 N | 076 46 39 W |
| Trinity United Methodist Church | Church | 41 | Calvert | 38 32 26 N | 076 35 10 W |
| Trinity United Methodist Church | Church | 7 | Cecil | 39 31 34 N | 075 48 49 W |
| Trinity United Methodist Church | Church | 12 | Dorchester | 38 35 41 N | 075 55 39 W |
| Trinity United Methodist Church | Church | 135 | Frederick | 39 42 18 N | 077 19 52 W |
| Trinity United Methodist Church | Church | 142 | Montgomery | 39 10 16 N | 077 16 25 W |
| Trinity United Methodist Church | Church | 7 | Wicomico | 38 22 01 N | 075 36 03 W |
| Trinity United Methodist Church | Church | 10 | Worcester | 38 15 04 N | 075 17 25 W |
| Tripcellar Swamp | Swamp | 3 | Harford | 39 20 10 N | 076 16 20 W |
| Triple Farm | Locale | 170 | Frederick | 39 33 25 N | 077 16 09 W |
| Triple Lakes | Populated Place | 230 | Allegany | 39 34 52 N | 078 50 48 W |
| Trippe Bay | Bay | -3 | Dorchester | 38 35 45 N | 076 17 28 W |
| Trippe Creek | Stream | | Talbot | 38 42 21 N | 076 08 34 W |
| Tripps Neck | Cape | 0 | Dorchester | 38 26 05 N | 075 55 53 W |
| Triton Beach | Beach | 1 | Anne Arundel | 38 52 54 N | 076 29 42 W |
| Triumph Church of God | Church | 54 | Baltimore (city) | 39 18 02 N | 076 38 04 W |
| Trolly Car Museum | Building | 98 | Montgomery | 39 05 42 N | 077 01 54 W |
| Trotts Branch | Stream | | Anne Arundel | 38 46 08 N | 076 33 50 W |
| Troupe Run | Stream | | Washington | 39 40 25 N | 077 47 39 W |
| Troupe Springs | Populated Place | 134 | Washington | 39 40 27 N | 077 47 34 W |
| Troupe Springs | Spring | 135 | Washington | 39 40 27 N | 077 47 33 W |
| Trout Creek | Bay | 1 | Worcester | 38 20 49 N | 075 04 54 W |
| Trout Run | Stream | | Garrett | 39 20 54 N | 079 17 24 W |
| Trout Run | Stream | | Garrett | 39 23 23 N | 079 23 31 W |
| Troutville | Populated Place | 131 | Frederick | 39 33 12 N | 077 20 14 W |
| Troxel | Populated Place | 138 | Frederick | 39 42 23 N | 077 20 09 W |
| Troy | Locale | 80 | Howard | 39 11 45 N | 076 45 46 W |
| Troy Island | Island | -3 | Somerset | 38 00 18 N | 076 01 15 W |
| Troyer | Populated Place | 222 | Baltimore | 39 36 18 N | 076 34 41 W |
| True Estates | Populated Place | 220 | Carroll | 39 29 50 N | 076 56 23 W |
| Trueman Point | Cape | 0 | Prince George's | 38 34 14 N | 076 40 56 W |
| Trueman Pointe | Populated Place | 14 | Calvert | 38 22 10 N | 076 28 02 W |
| Truitt | Populated Place | 10 | Wicomico | 38 20 48 N | 075 21 55 W |
| Truitt Branch | Stream | | Wicomico | 38 20 15 N | 075 22 47 W |
| Trumans Hope (historical) | Locale | 28 | St. Mary's | 38 30 17 N | 076 43 17 W |
| Trump | Populated Place | 215 | Baltimore | 39 40 56 N | 076 36 08 W |
| Trunk Gut | Stream | | Charles | 38 22 02 N | 076 58 46 W |
| Truth for Youth Grade School | School | 183 | Washington | 39 38 54 N | 077 44 06 W |
| Truth Hall | Building | 74 | Baltimore (city) | 39 20 47 N | 076 35 06 W |
| Truxton Heights | Populated Place | 10 | Anne Arundel | 38 58 00 N | 076 30 21 W |
| Truxton Park | Park | 10 | Anne Arundel | 38 57 54 N | 076 29 55 W |
| Tubby Cove | Bay | -4 | Kent | 39 02 49 N | 076 13 21 W |
| Tubman Church | Church | 0 | Dorchester | 38 23 11 N | 076 14 52 W |
| Tubman High School | School | 129 | Howard | 39 11 10 N | 076 52 47 W |
| Tubmill Branch | Stream | | Caroline | 38 58 13 N | 075 48 05 W |
| Tuckahoe Bridge | Bridge | -3 | Caroline | 38 49 52 N | 075 54 50 W |
| Tuckahoe Bridge | Bridge | 0 | Queen Anne's | 38 55 02 N | 075 56 45 W |
| Tuckahoe Chapel | Church | 4 | Queen Anne's | 38 54 56 N | 075 56 59 W |
| Tuckahoe Creek | Stream | | Talbot | 38 48 53 N | 075 53 50 W |
| Tuckahoe Hundred (historical) | Civil | 16 | Caroline | 38 54 34 N | 075 52 49 W |
| Tuckahoe Neck | Cape | 13 | Caroline | 38 51 18 N | 075 53 20 W |
| Tuckahoe Shopping Center | Locale | 10 | Caroline | 38 55 18 N | 075 56 49 W |
| Tuckahoe Springs | Populated Place | 10 | Caroline | 38 50 00 N | 075 54 19 W |
| Tuckahoe State Park | Park | 10 | Caroline | 39 00 11 N | 075 54 48 W |
| Tuckahoe State Park | Park | 2 | Caroline | 38 58 00 N | 075 56 34 W |
| Tuckahoe State Park Dam | Dam | 2 | Caroline | 38 58 00 N | 075 56 35 W |
| Tucker Creek | Stream | | Calvert | 38 35 56 N | 076 39 59 W |
| Tuckers Branch | Stream | | Carroll | 39 22 50 N | 077 00 57 W |
| Tuckers Reach | Populated Place | 55 | Calvert | 38 41 53 N | 076 36 42 W |