- Akin
- Abingdon
- Adair
- Addison
- Addison township
- Albers
- Alden
- Alden Township
- Aledo
- Alexander Precinct
- Alexander
- Alexis
- Algonquin Township
- Algonquin
- Alhambra
- Alhambra Township
- Allerton
- Alma Township
- Alma
- Alpha
- Alsip
- Altamont
- Alto Pass
- Alto Pass Precinct
- Alton
- Altona
- Amboy
- Amboy township
- Anchor Township
- Anchor
- Ancona
- Andover
- Anna
- Annapolis
- Annawan township
- Annawan
- Antioch township
- Antioch
- Apple River
- Apple River Township
- Arcola Township
- Arcola
- Argenta
- Arlington
- Arlington Heights
- Armington
- Aroma Park
- Arrowsmith Township
- Arrowsmith
- Arthur
- Ashkum Township
- Ashkum
- 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