| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Trace Hollow | city | Maryland | United States | 38.30 | -75.57 | 49 | |
| Traceys Meadows | city | Maryland | United States | 38.81 | -76.60 | 104 | |
| Tracys Landing | city | Maryland | United States | 38.78 | -76.60 | 98 | |
| Trails | city | Maryland | United States | 38.72 | -76.57 | 124 | |
| Trails End Trailer Park | city | Maryland | United States | 38.89 | -76.67 | 52 | |
| Tranquility | city | Maryland | United States | 38.62 | -76.55 | 118 | |
| Tranquility | city | Maryland | United States | 38.72 | -76.58 | 98 | |
| Tranquility | city | Maryland | United States | 39.35 | -77.26 | 830 | |
| Tranquility Estates | city | Maryland | United States | 39.65 | -77.14 | 830 | |
| Trappe | city | Maryland | United States | 38.31 | -75.19 | 16 | |
| Trappe | city | Maryland | United States | 38.66 | -76.06 | 36 | |
| Trappe Landing | city | Maryland | United States | 38.66 | -76.08 | 3 | |
| Travilah | city | Maryland | United States | 39.07 | -77.26 | 298 | |
| Travilah Acres | city | Maryland | United States | 39.09 | -77.27 | 324 | |
| Travilah Meadows | city | Maryland | United States | 39.07 | -77.27 | 298 | |
| Treasure Mountain | city | Maryland | United States | 39.36 | -77.20 | 830 | |
| Trebee Highlands | city | Maryland | United States | 39.59 | -76.94 | 830 | |
| Tree Top Station | city | Maryland | United States | 39.47 | -76.81 | 830 | |
| Tree Tops | city | Maryland | United States | 39.09 | -76.46 | 0 | |
| Treeland | city | Maryland | United States | 38.58 | -76.10 | 3 | |
| Treelin Manor | city | Maryland | United States | 39.65 | -76.87 | 853 | |
| Treeview Estates | city | Maryland | United States | 38.67 | -77.00 | 200 | |
| Trego | city | Maryland | United States | 39.43 | -77.68 | 830 | |
| Tremper Farm | city | Maryland | United States | 39.39 | -76.45 | 147 | |
| Trengail Manor | city | Maryland | United States | 39.64 | -77.67 | 830 | |
| Trenton | city | Maryland | United States | 39.58 | -76.81 | 830 | |
| Trenton Mill | city | Maryland | United States | 39.58 | -76.81 | 830 | |
| Trenton Place | city | Maryland | United States | 38.45 | -76.82 | 147 | |
| Trevanion | city | Maryland | United States | 39.62 | -77.14 | 830 | |
| Trevanion Terrace | city | Maryland | United States | 39.65 | -77.17 | 830 | |
| Trevor Woods | city | Maryland | United States | 39.18 | -76.63 | 49 | |
| Tri-Woods | city | Maryland | United States | 39.60 | -77.07 | 830 | |
| Triadelphia (historical) | city | Maryland | United States | 39.23 | -77.04 | 390 | |
| Triadelphia (historical) | city | Maryland | United States | 39.23 | -77.04 | 390 | |
| Triadelphia Woods | city | Maryland | United States | 39.29 | -76.93 | 396 | |
| Tricfield | city | Maryland | United States | 38.78 | -76.23 | 3 | |
| Trident Acres | city | Maryland | United States | 39.59 | -76.92 | 830 | |
| Trimble Fields | city | Maryland | United States | 39.42 | -76.31 | 39 | |
| Trinity | city | Maryland | United States | 38.29 | -75.75 | 6 | |
| Trinity | city | Maryland | United States | 38.94 | -75.88 | 49 | |
| Trinity Farms | city | Maryland | United States | 39.07 | -76.54 | 3 | |
| Triple Lakes | city | Maryland | United States | 39.58 | -78.85 | 830 | |
| Troupe Springs | city | Maryland | United States | 39.67 | -77.79 | 830 | |
| Troutville | city | Maryland | United States | 39.55 | -77.34 | 830 | |
| Troxel | city | Maryland | United States | 39.71 | -77.34 | 830 | |
| Troyer | city | Maryland | United States | 39.61 | -76.58 | 830 | |
| True Estates | city | Maryland | United States | 39.50 | -76.94 | 830 | |
| Trueman Pointe | city | Maryland | United States | 38.37 | -76.47 | 49 | |
| Truitt | city | Maryland | United States | 38.35 | -75.37 | 26 | |
| Trump | city | Maryland | United States | 39.68 | -76.60 | 830 | |
| Truxton Heights | city | Maryland | United States | 38.97 | -76.51 | 49 |