I live in South Dakota, and IMO, cheer isn't that big here. Both the school's cheer team and dance team go to the same competitions.
Competition season here is during football season. Varsity cheers for Varsity football but also goes to comp. I was JV for football season and there aren't any comps for JV.
As far as regionals, there aren't any here. There's a ton of school cheer and dance invitationals, though. Our Varsity team went to about 8 or 9 of them. Anyone can go to state.
I hate the way they do the divisions here. For dance, there's small and large (I can't remember the number requirement). Out of that, there's hip-hop, jazz, kick and pom. All of the girls do every category. So, if 14 girls are doing hip-hop, then those exact same 14 girls are doing the other 3 categories.
As for cheer, there's the small division (6-12 girls) and the large division (13-26 girls). From there, there's small stunting/non-tumbling, large stunting/non-tumbling, small stunting/tumbling and large stunting/tumbling. There was a coed division a couple years back, but it got "discontinued". :/
It gets so broken up, and when cheer isn't even a huge deal in your state, (as someone previously posted) some teams are the only ones in that division. OMG I'm writing a novel here. I'll stop now, lol.
If anyone's interested, the South Dakota High School Activities Association website has tons more!
Competitive Cheer | Athletics | SDHSAA