19 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Aspen Hill | Montgomery County | 55,638 |
| Annapolis | Anne Arundel County | 40,338 |
| Arnold | Anne Arundel County | 25,255 |
| Arbutus | Baltimore County | 20,048 |
| Aberdeen | Harford County | 19,166 |
| Adelphi | Prince George's County | 17,408 |
| Accokeek | Prince George's County | 13,288 |
| Annapolis Neck | Anne Arundel County | 13,153 |
| Abingdon | Harford County | 6,389 |
| Ashton-Sandy Spring | Howard County | 5,565 |
| Andrews AFB | Prince George's County | 3,130 |
| Aberdeen Proving Ground | Harford County | 2,856 |
| Adamstown | Frederick County | 2,400 |
| Arden Severn | Anne Arundel County | 1,215 |
| Algonquin | Dorchester County | 1,008 |
| Aquasco | Prince George's County | 631 |
| Accident | Garrett County | 326 |
| Allen | Wicomico County | 148 |
| Antietam | Washington County | 75 |