19 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Aspen Hill | Montgomery County | 54,520 |
| Annapolis | Anne Arundel County | 40,647 |
| Arnold | Anne Arundel County | 23,983 |
| Arbutus | Baltimore County | 20,928 |
| Aberdeen | Harford County | 18,996 |
| Adelphi | Prince George's County | 17,537 |
| Accokeek | Prince George's County | 13,634 |
| Annapolis Neck | Anne Arundel County | 12,720 |
| Abingdon | Harford County | 6,608 |
| Ashton-Sandy Spring | Howard County | 5,386 |
| Andrews AFB | Prince George's County | 3,091 |
| Adamstown | Frederick County | 2,382 |
| Aberdeen Proving Ground | Harford County | 2,381 |
| Arden on the Severn | Anne Arundel County | 1,651 |
| Algonquin | Dorchester County | 994 |
| Aquasco | Prince George's County | 624 |
| Accident | Garrett County | 330 |
| Allen | Wicomico County | 112 |
| Antietam | Washington County | 59 |