ASD Support?

I am in a process of looking for homes in the area and my son is on the spectrum, but I have been seeing so many reviews about how SC is not so great for children with disabilities and he was diagnosed with level three autism and he is nonverbal and I was just reaching out to just see what is the best school zone in the area for him he's 4.. I've been looking at the Greenville area I just wanted to have all my ducks in a row.