Tri-State State is a university located in the Tri-State Area. The university is a major subject of focus in the episode Act Your Age, when Phineas Flynn and Isabella Garcia-Shapiro finally realize each other's true feelings. In Act Your Age, Phineas must choose between two colleges, Danville University or Tri-State State College. Upon speaking with his friends, Phineas discovers that Isabella chose to attend Tri-State State, to which he replies that he had not seen her much that summer. After chasing Isabella all over Danville, he tells her that he intends to enter the same college with her. 

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