Cuptopolis

"Cuptopolis. Home of the Cup Kid Squad. Reminds me of Seoul and New York City combined. Oh, and do I mention the Angel Grove? Oh, and do Cuphead and Mugman have the right to be living there? Well, maybe someday. If this all-kid squad can defeat Dr. Cuptor in the first place, then the Devil and King Dice's gotta be next."

--Su Ji-Hoon, The Squad Gets a Deal

Cuptopolis is the metropolis which located in unknown somewhere of Inkwell Isle that it will be one of the populated cities in Inkwell Isle.

Also,it is where Cup Kid Squad will be located since Dr. Cuptor and his henchmen trying conquer it until everythings of USRAC War changed.