- Abingdon (Population: 3,612)
- Addison (Population: 35,914)
- Albion (Population: 1,933)
- Aledo (Population: 3,613)
- Algonquin (Population: 23,276)
- Alorton (Population: 2,749)
- Alsip (Population: 19,725)
- Altamont (Population: 2,283)
- Alton (Population: 30,496)
- Amboy (Population: 2,561)
- Andalusia (Population: 1,050)
- Anna (Population: 5,136)
- Antioch (Population: 8,788)
- Arcola (Population: 2,652)
- Arlington Heights (Population: 76,031)
- Arthur (Population: 2,203)
- Ashland (Population: 1,361)
- Ashton (Population: 1,142)
- Assumption (Population: 1,261)
- Astoria (Population: 1,193)
- Athens (Population: 1,726)
- Atkinson (Population: 1,001)
- Atlanta (Population: 1,649)
- Atwood (Population: 1,290)
- Auburn (Population: 4,317)
- Aurora (Population: 142,990)
- Aviston (Population: 1,231)
