- Abell
- Aberdeen
- Aberdeen Proving Ground
- Abingdon
- Abingdon Reserve
- Abington Shores
- Abrams
- Academy Acres
- Academy Acres
- Academy Heights
- Academy Hill
- Academy Hills
- Academy Junction
- Academy Lane
- Accident
- Acco Park
- Accokeek
- Accokeek Acres
- Accokeek Lawn
- Acredale
- Acresville
- Acton Village
- Adam Island
- Adams Chance
- Adams Heights
- Adamstown
- Adamstown Village
- Adelina
- Adelphi
- Adelphi Park