- Aberdeen (Population: 13,842)
- Aberdeen Proving Ground (Population: 3,116)
- Accokeek (Population: 7,349)
- Adelphi (Population: 14,998)
- Algonquin (Population: 1,361)
- Andrews AFB (Population: 7,925)
- Annapolis (Population: 35,838)
- Arbutus (Population: 20,116)
- Arden-on-the-Severn (Population: 1,971)
- Arnold (Population: 23,422)
- Ashton-Sandy Spring (Population: 3,437)
- Aspen Hill (Population: 50,228)
