Omnitrix City is the city in which Ben 10,000 operates in the future first appearing in Ben 10,000. It is on Earth, near Mt. Rushmore.
As seen in Ben 10,000, its population consists of both humans and aliens. One of its landmark buildings is the Ben 10,000 Tower. It also contains a large statue of Ben 10,000.
Ben 10: Ultimate Alien
Ben 10: Omniverse