Metropolis is a major city in the US where Superman fights crime. The fictional city was always meant to be generic, formed from "metro," meaning city, and "polis," meaning city. But as children reading comic books, we always saw it as New York City. You might be surprised to learn that in the earliest Superman comic book, Clark Kent lived and worked in Cleveland. After relocating to the fictional Metropolis, clues in the comics pointed to it being New York, and it was explained that Metropolis was near Gotham City. Both cities later moved to different states.
The 2013 movie Man of Steel seemed to place Metropolis in Chicago. But the 2025 Superman has numerous clues that Metropolis is now in Delaware. The map above, enlarged in this reddit post, appears briefly in the film. The city is situated by Delaware Bay. The streets are named after people who worked on the film or on other Superman movies. It is also stamped with "Greater Cleveland Partnership." Those who know recognize a lot of Cleveland in the film, because a lot of it was filmed there. So why Delaware? Read the history of the city that moves from place to place at Big Think.