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