Damn, I guess this is the downside to living in a state that's #1 in diabetes and obesity. Not a whole lot of exercising going on. There is a gym that teaches cardio kick boxing. However, it's completely non-contact and low impact, which is maddeningly unhelpful.
As far as I know, there is no gym that does boxing here. Also, there is a martial arts club that teaches traditional jiu jitsu and Brazilian jiu jitsu. I know nothing about either of those, but if they can provide anywhere near the cardio that Muay Thai has given me, I'd be willing to give it a shot.
you will enjoy BJJ
but if you contact the American Amauter Boxing Association (I think that's what they are called) they can tell you the closest Boxing gym to your area