| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Twelve Hills | city | Maryland | United States | 39.23 | -76.97 | 830 | |
| Twelve Trees | city | Maryland | United States | 39.39 | -76.83 | 830 | |
| Twiggs Corner | city | Maryland | United States | 38.31 | -75.70 | 19 | |
| Twiggtown | city | Maryland | United States | 39.64 | -78.66 | 1669 | |
| Twilley | city | Maryland | United States | 38.45 | -75.35 | 36 | |
| Twin Brook | city | Maryland | United States | 39.07 | -77.12 | 301 | |
| Twin Brook Estates | city | Maryland | United States | 39.50 | -76.37 | 298 | |
| Twin Brook Forest | city | Maryland | United States | 39.08 | -77.12 | 305 | |
| Twin Cove | city | Maryland | United States | 39.18 | -76.60 | 13 | |
| Twin Cove Estates | city | Maryland | United States | 38.88 | -76.35 | 3 | |
| Twin Harbors | city | Maryland | United States | 39.06 | -76.51 | 22 | |
| Twin Hills | city | Maryland | United States | 38.99 | -76.59 | 98 | |
| Twin Knolls | city | Maryland | United States | 39.51 | -76.88 | 830 | |
| Twin Lakes | city | Maryland | United States | 38.65 | -76.61 | 147 | |
| Twin Lakes | city | Maryland | United States | 39.70 | -77.01 | 872 | |
| Twin Maples | city | Maryland | United States | 39.34 | -77.10 | 830 | |
| Twin Oaks | city | Maryland | United States | 39.16 | -76.88 | 393 | |
| Twin Oaks | city | Maryland | United States | 39.21 | -76.65 | 147 | |
| Twin Ridge | city | Maryland | United States | 39.14 | -76.61 | 49 | |
| Twin Ridge Estates | city | Maryland | United States | 39.64 | -76.47 | 830 | |
| Twin River Trailer Park | city | Maryland | United States | 38.29 | -75.88 | 6 | |
| Twin Shields Estates | city | Maryland | United States | 38.76 | -76.65 | 127 | |
| Twinbrook Estates | city | Maryland | United States | 38.62 | -77.01 | 200 | |
| Twinridge | city | Maryland | United States | 39.39 | -76.67 | 360 | |
| Twist and Turn Estates | city | Maryland | United States | 39.22 | -77.01 | 400 | |
| Two Johns Estates | city | Maryland | United States | 38.82 | -75.86 | 19 | |
| Two Locks | city | Maryland | United States | 39.62 | -77.92 | 830 | |
| Two Rivers | city | Maryland | United States | 39.49 | -75.91 | 6 |