- Appledale
- Appleton
- Appleyard
- Apricot
- Arcadia
- Arcadia
- Arden
- Ardenia Gale Mobile Home Park
- Ardenvoir
- Argyle
- Ariel
- Arletta
- Arlington
- Arlington Heights
- Arlington Junction
- Armitage Island
- Armstrong
- Arney's Dam Mobile Home Park
- Arroyo Heights
- Artesian
- Artic
- Artondale
- Arzina
- Ash
- Ashby
- Ashford
- Ashue
- Asotin
- Atkinson
- Atlasta Mobile Park