| City Name | County | Zip Code |
| Damascus | Montgomery | 20872 |
| Dameron | Saint Mary's | 20628 |
| Dames Quarter | Somerset | 21820 |
| Daniel | Howard | 21043 |
| Dares Beach | Calvert | 20678 |
| Dargan | Washington | 21782 |
| Darlington | Harford | 21034 |
| Davidsonville | Anne Arundel | 21035 |
| Dayton | Howard | 21036 |
| Deal Island | Somerset | 21821 |
| Deale | Anne Arundel | 20751 |
| Deep Creek Lake | Garrett | 21541 |
| Deep Run Park | Baltimore | 21227 |
| Deer Park | Garrett | 21550 |
| Delmar | Wicomico | 21875 |
| Dennings | Carroll | 21776 |
| Denton | Caroline | 21629 |
| Derwood | Montgomery | 20855 |
| Detour | Carroll | 21757 |
| Dickerson | Montgomery | 20842 |
| District Heights | Prince George's | ***** |
| Dorsey | Howard | 21227 |
| Doubs | Frederick | 21710 |
| Dowell | Calvert | 20629 |
| Downsville | Washington | 21795 |
| Drayden | Saint Mary's | 20630 |
| Dublin | Harford | 21154 |
| Dundalk | Baltimore | 21222 |
| Dundalk Sparrows Point | Baltimore | ***** |
| Dunkirk | Calvert | 20754 |
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