- Amblerville
- Amboy
- Amboy Center
- Amenia Union
- American Island
- Amherst
- Amity
- Amity Harbor
- Anaquassacook
- Ancram
- Ancramdale
- Anderson
- Angel Isle
- Angells Corner
- Angola Lake Shore Addition
- Angus
- Annadale
- Annandale-on-Hudson
- Annsville
- Antone Mountain Mobile Home Park
- Antones's Mobile Home Park
- Antrim
- Apaquogue
- Apex
- Apple Grove Mobile Home Park
- Apple Island
- Applegate Corner
- Appleton
- Applewood Community
- Applewood Mobile Home Estates