Wow. Gotham City was almost… um:
Batman co-creator Bill Finger explains: “Originally I was going to call Gotham City ‘Civic City’. Then I tried Capital City, then Coast City. Then I flipped through the phone book and spotted the name ‘Gotham Jewelers’ and said, ‘That’s it’, Gotham City.”
I like their characterization of Mega City One, home to Judge Dredd. I haven’t read any of those comics, but now feel like I sort of want to.
Finally: I think the one glaring omission is Astro City. How ’bout you?