19 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Dundalk | Baltimore County | 65,725 |
| Damascus | Montgomery County | 17,111 |
| Darnestown | Montgomery County | 6,840 |
| District Heights | Prince George's County | 5,912 |
| Deale | Anne Arundel County | 5,218 |
| Denton | Caroline County | 5,100 |
| Delmar | Wicomico County | 4,964 |
| Drum Point | Calvert County | 3,294 |
| Dunkirk | Calvert County | 2,676 |
| Derwood | Montgomery County | 1,745 |
| Downsville | Washington County | 894 |
| Darlington | Harford County | 340 |
| Deer Park | Garrett County | 298 |
| Deal Island | Somerset County | 286 |
| Danville | Allegany County | 284 |
| Dames Quarter | Somerset County | 213 |
| Detmold | Allegany County | 133 |
| Dargan | Washington County | 130 |
| Dawson | Allegany County | 33 |