- Adair
- Adams
- Adrian
- Agency Township
- Agency
- Airport
- Airport Drive
- Albany
- Aldrich
- Alexander
- Alma
- Alpine
- Altamont
- Alton
- Amazonia
- Amity
- Amoret
- Amsterdam
- Anderson
- Anderson East
- Anderson West
- Archie
- Arcola
- Arrow Point
- Arrow Rock Township
- Arrow Rock
- Ash
- Ash Grove
- Atchison
- Atchison
- Athens
- Auglaize
- Auglaize
- Aurora
- Aurora
- Aurora Township
- Aurora Springs
- Austin
- Ava
- Avilla
- Avondale