- Adrian (Population: 1,780)
- Advance (Population: 1,244)
- Affton (Population: 20,535)
- Albany (Population: 1,937)
- Anderson (Population: 1,856)
- Appleton City (Population: 1,314)
- Arnold (Population: 19,965)
- Ash Grove (Population: 1,430)
- Ashland (Population: 1,869)
- Aurora (Population: 7,014)
- Ava (Population: 3,021)
