Mighty Mountain School is a public elementary school located in Elwood City and according to Elwood City Turns 100!, one of the 15 schools in Elwood City. They are the antagonist rivals of Lakewood Elementary School. In April 9th, Arthur and his friends from Lakewood were transferred to this school while Lakewood was under repairs from being damaged by fire, but eventually transferred back to Lakewood when it was restored. Binky and some of his friends that are part of the Tough Customers, used to go to this school before transferring to Lakewood Elementary at some point.