- Annandale
- Annapolis Rock
- Annetta Gardens
- Arrowhead
- Asbury Woods
- Aspenwood
- Autumn Hill
- Autumn Woods
- Amberly Trailer Park
- Abrams
- Allanwood
- Alta Vista
- Alta Vista Terrace
- Ancient Oak
- Ancient Oak North
- Ancient Oak West
- Anscroft
- Arcola
- Ashburton
- Ashleigh
- Ashley Manor
- Ashmead
- Ashton Manor
- Ashton Pond
- Ashton Preserve
- Ashton River Estates
- Ashton-Sandy Spring
- Aspen Hill Park
- Aspen Knolls
- Avenel