Shelbyville vs. Springfield
In 1796 a group of pioneers leaves Maryland, heading towards a new place: New Sodom. The two learders of this group, Jebediah Springfield and Shelbyville Manhaten founded two towns: Springfield where people lived a life devoted to chastity, abstinence, and a flavorless mush I call rootmarm, and Shelbyville where people could marry their own cousins, and as Grandpa Simpsons said: "The town of Springfield was born on that day. And to mark that sweet moment, our people planted this lemon tree. Lemons being the sweetest fruit available at the time".
 
Shelbyville
In episode 2F22 Lemon of Troy, is the Springfield Lemon Tree stolen by people from Shelbyville. Bart and his friends travels to Shelbyville to find the tree and take it back. Shelbyville is pretty much the same as Springfield, but with little differences, such as Joe's Bar, instead of Moe's Bar.
Last Exit To Springfield A Home For Lenny Rex Banner Serious Burns
The Springfield Gallery Josh's Willie Beyond Blunderdome The Simpsons Showcase