Well, it's pretty well known that Honolulu has a serious drug problem. I would guess that most of the drug dealers carry firearms, and don't have permits to do so. And the city's violent crime rate is in the top 75 nationwide. I'm kind of guessing that most of the violent criminals don't get carry licenses. So I suspect that there are a pretty fair number of career criminals in Hawaii (particularly Honolulu) that carry illegally.It's a class B felony, 25K fine and up to 10 years in prison. I wonder just how many people carry illegally in that state?
As far as otherwise-law-abiding-citizens who carry illegally for self-defense, my totally subjective guess would be, probably not very many. Nonetheless, I would be willing to bet that there are a whole lot of folks in Hawaii who are carrying illegally... Mainly folk who are doing a lot of other stuff illegally.