- Antone Mountain Mobile Home Park
- Antones's Mobile Home Park
- Antrim
- Antwerp
- Apalachin
- Apaquogue
- Apex
- Apple Grove Mobile Home Park
- Apple Island
- Applegate Corner
- Appleton
- Applewood Community
- Applewood Mobile Home Estates
- Apulia
- Apulia Station
- Aquebogue
- Aqueduct
- Aquetuck
- Arabia
- Arabia
- Arbor Valley
- Arcade
- Arcade Valley Estates Mobile Home Park
- Arcadia Island
- Archdale
- Archville
- Arctic
- Arden
- Ardonia
- Ardsley