- Accident
- Accokeek
- Adelphi
- Algonquin
- Annapolis
- Arbutus
- Arden on the Severn
- Aspen Hill
- Aberdeen
- Arnold
- Abell
- Aberdeen Proving Ground
- Abingdon
- Abingdon Reserve
- Abington Shores
- Abrams
- Academy Acres
- Academy Acres
- Academy Heights
- Academy Hill
- Academy Hills
- Academy Junction
- Academy Lane
- Acco Park
- Accokeek Acres
- Accokeek Lawn
- Acredale
- Acresville
- Acton Village
- Adam Island