19 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Dundalk | Baltimore County | 67,002 |
| Damascus | Montgomery County | 17,243 |
| Darnestown | Montgomery County | 6,640 |
| District Heights | Prince George's County | 5,912 |
| Denton | Caroline County | 5,100 |
| Delmar | Wicomico County | 4,964 |
| Deale | Anne Arundel County | 4,646 |
| Drum Point | Calvert County | 3,041 |
| Dunkirk | Calvert County | 2,846 |
| Derwood | Montgomery County | 1,717 |
| Downsville | Washington County | 1,059 |
| Danville | Allegany County | 678 |
| Darlington | Harford County | 495 |
| Deer Park | Garrett County | 298 |
| Deal Island | Somerset County | 240 |
| Dames Quarter | Somerset County | 223 |
| Dargan | Washington County | 195 |
| Detmold | Allegany County | 124 |
| Dawson | Allegany County | 52 |