|Eerste verschijning||Oh, There You Are, Perry|
The Quad-State Area is where The Regurgitator's base was located in the episode "Oh, There You Are, Perry". It is mentioned while Major Monogram is briefing Agent P during the beginning of the episode. Other than the fact that The Regurgitator had built his base here, not much is known about the Quad-State Area. Most likely, it is located on the border of Utah, Colorado, New Mexico, and Arizona. So far it has only even been mentioned in the episode "Oh, There You Are, Perry". The name is similar to the Tri-State Area, where Phineas and Ferb live, and the place Doofenshmirtz tries to take over.