When people say the Criminal Minds fanbase is hardcore, they mean it. A devoted fan on Reddit made an insanely detailed map going over every state they've been to and the episodes that correlate with it. Many fans talked about the map, which detailed every state from the East to the West coast, but as the creator and many other viewers discovered, there's one state missing. The Criminal Minds gang has gone to, or at least mentioned, every state — except Hawaii.
It's true, Hawaii is never mentioned in the 15 seasons the show aired. Another Reddit user went on to say, "Yeah, unfortunately Hawaii is the only state where nothing ever happened in Criminal Minds. Arkansas and North Dakota never had their own episode, but part of 'Chameleon' did take place in Little Rock, and the only shoutout ND got was that Sydney Manning (Adrianne Palicki) from 'The Thirteenth Step' murdered Ray Donovan's (Jonathan Tucker) girlfriend there before the events of the episode."
While there's never been an official statement as to why they never even mention Hawaii, fans have theories. One of the most popular being that Hawaii Five-0, another CBS crime show, was mainly set there. People believe that the network didn't want the shows to cross paths, no matter how cool it might have been for fans to see.