It is certainly NOT modern cannon by any means, but in the early 80’s there was a tabletoo DC heroes roleolaying game, and one of the supplements provided an atlas and showed where the various fictional cities were, and what state. It was pretty facinating. Each of them was spun like a fictional “sister city” to an actual city.
Gotham City is in south Jersey. Like if southern New Jersey had a New York. So next time you watch jersey shore, and see the brightly colored outfits, and sort of silly nicknames, OMG gotham is along the Jersey shore.
Metropolis was in Southern Illinois (where an actual small towm called Metropolis exists), and was a gleaming sister city to Chicago.
Central City is in North Michigan, and with it’s emphasis on innovation, and speed, was a higher tech sister city to Detroit.
Coast City is in Northern California and the Ferris Aircraft facilities are along the coast.
The middle east was also pretty crazy, Kandaq’ sits right next to Iraq, and Bilaya is like a sliced off puece of Lybia. Qurac sits on the side if Iraq, sharing a border with Kandaq.