THE SIMPSONS Season 12 Episode 2 : A Tale of Two Springfields
When the phone company gives Springfield a new area code, Homer revolts taking the part of Springfield with the new area code (the poor side of town) with him. Soon it's Olde Springfield versus New Springfield. As mayor of New Springfield Homer runs it haphazardly and soon the population of New Springfield moves over to Olde Springfield, leaving the Simpson family as the only residents. It takes a Who concert to bring the two parts of Springfield together.