I went through the 4A list of schools on the KSHSAA website, compared that to Regional assignments, and came up with this list of schools that do not appear to offer wrestling.

Girard
Iola
Kingman
Wichita Collegiate

I know sometimes a wrestler will compete for a nearby team if his school does not offer wrestling. He is allowed to do this until regionals/state, at which time he must represent his own school at his appropriate class tournament. I think this is how it works.