Justice League: A Better World
Coast City, California
Coast City is a coastal city located on the western coast of the United States of America. The city is popular for being the hometown of the Green Lantern (Hal Jordan) and over the years has become a big supporter of their green-light hero. Coast City is located in California, USA. The city is also the location of Ferris Aircraft; a successful aerospace engineering corporation. There is a Nuclear Reactor on Coast City.
Ref. Character p.18
DC HEROES RPG 3rd Edition p.150
DC Wikia entry