- Akin
- Abingdon
- Adair
- Addison
- Addison township
- Albany
- Albers
- Alden
- Aledo
- Alexander
- Alexis
- Algonquin
- Algonquin Township
- Alhambra
- Alhambra Township
- Allerton
- Alma
- Alpha
- Alsip
- Altamont
- Alto Pass
- Alton
- Altona
- Amboy
- Anchor
- Ancona
- Andalusia
- Andover
- Anna
- Annapolis
- Annawan
- Annawan township
- Antioch
- Antioch township
- Apple River
- Arcola
- Argenta
- Arlington
- Arlington Heights
- Armington
- Aroma Park
- Arrowsmith
- Arrowsmith Township
- Arthur
- Ashkum
- Ashland
- Ashley
- Ashmore
- Ashmore Township
- Ashton
- Assumption
- Astoria
- Athens
- Atkinson
- Atlanta
- Atlanta Township
- Atwood
- Auburn
- Augusta
- Aurora
- Aurora Township
- Aux Sable
- Ava
- Aviston
- Avon