It's due to DC comics. When the show 1st started, DC was hesitant to allow things directly from the Comics and initially was gunning for a Nolanverse type world and "Star City" sounded too comic-booky. It was when they realize that their core following are hardcore comic book fans was when they decided to merge everything directly true to the comics.That's my ONE gripe about the show. There's absolutely NO reason it shouldn't have been.