19 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Dundalk | Baltimore County | 65,867 |
| Damascus | Montgomery County | 17,235 |
| Darnestown | Montgomery County | 6,843 |
| District Heights | Prince George's County | 5,908 |
| Deale | Anne Arundel County | 5,237 |
| Delmar | Wicomico County | 5,181 |
| Denton | Caroline County | 5,151 |
| Drum Point | Calvert County | 3,332 |
| Dunkirk | Calvert County | 2,854 |
| Derwood | Montgomery County | 1,703 |
| Downsville | Washington County | 930 |
| Darlington | Harford County | 335 |
| Deer Park | Garrett County | 297 |
| Danville | Allegany County | 285 |
| Deal Island | Somerset County | 274 |
| Dames Quarter | Somerset County | 216 |
| Detmold | Allegany County | 142 |
| Dargan | Washington County | 128 |
| Dawson | Allegany County | 28 |