Um. There's no real South Park. But that would be awesome. :]

I checked it out and whoa actually there is a real South Park. It's even called South Park but it isn't a city it's a "high intermontane grassland basin" in the Colorado Rockies. Trey Parker and Matt Stone met in college near there. That web site sells square inches of land some dude owns there.

I lived in colorado and all those towns are real except for south park. Although, there is such a thing as the south park basin.