Opal City is a city in the United States of America.
At an unknown point in time, Adam Foster moved to Opal City.
- Opal City was first featured in Starman vol. 2, #0 (1994) and was created by James Robinson and Tony Harris. In the DC universe, it is located in Maryland, and it is the home of the superhero, Starman as well as the Elongated Man, for a period of time.