I lived in Grand Forks several years ago and there wasn't a support group there at the time that I knew of. The closest one was in Fargo. I went a few times, carpooling with 2 other members that went. I am sorry I do not remember a contact from there, a therapist told me about it.
I felt a little awkward there but then again that was at the very start of my transition and I tend to feel slightly awkward anywhere without a laptop and great music

On the plus side, a 'vocal coach' attended those meetings too when I went, which can be a big help for some people. Not sure if they still meet.
No idea about Bismarck.