There is no official listing for a US city with the nickname A-town. However, Atlanta in the state of Georgia is nicknamed "the big A" which is similar to A-town.
A-Town or Atown
Chicago.
Chicago
Orlando FL
Chicago, Illinois has the nickname of Windy City. Some say the wind comes from politicians though.
The Mile High City - Denver, Colorado.
Saffaron atown (Kanto)
american paradise
The Eternal City or The City of Fountains is Rome's nickname.
Virginia
Virginia
Nashville's nickname is "Music City".