- Antietam Farmettes
- Antietam Heights
- Antietam Manor
- Antietam Overlook
- Appletown
- Arboranda Estates
- Ashton
- Augusta
- Athol
- Autumn Grove
- Avalon Park
- Albatross Mobile Home Park
- Assacorkin Island
- Assateague Island
- Ayer Island
- Ayres Lane Estates
- Aberdeen
- Arnold
- Abell
- Aberdeen Proving Ground
- Abingdon
- Adamstown
- Ady
- Allen
- Andrews AFB
- Antietam
- Aquasco
- Arundel Village
- Ashton
- Avenue