- Adams
- Addison
- Addison township
- Adkins
- Afton
- Albany Township
- Albany
- Albion
- Alden Township
- Aledo
- Algonquin Township
- Algonquin
- Allendale
- Allenville
- Allerton
- Allin
- Alma
- Alma Township
- Alpha
- Alsip
- Altamont
- Alton
- Alvin
- Amboy
- Amboy township
- Amity
- Ancona
- Andalusia
- Andalusia Township
- Andover Township
- Andover
- Anna
- Annapolis
- Annawan
- Annawan township
- Antioch
- Antioch township
- Appanoose
- Apple River Township
- Apple River
- Arbury Hills
- Arcola Township
- Arcola
- Argenta
- Arispie
- Arlington Heights
- Armington
- Armstrong
- Aroma
- Aroma Park
- Arrowsmith Township
- Arrowsmith
- Artesia
- Arthur
- Ash Grove
- Ashkum
- Ashkum Township
- Ashmore
- Ashmore Township
- Ashton
- Ashton Township
- Assumption Township
- Assumption
- Atkinson township
- Atkinson
- Atlas
- Atwood
- Auburn
- Aurora
- Aurora Township
- Aux Sable
- Ava
- Avena
- Avon
- Ayers