Public School is a bar that is owned by Danny Cordray. In Costume Contest, Danny invites his coworkers at Dunder Mifflin Scranton to a party at the bar, at which point Andy and Kevin conclude that it would be too awkward to attend, given Danny's "history" with Pam.
According to Danny, the bar is located off of Exit 11, although he does not specify the interstate to which he is referring.