Hey look, I have a blog! Guess I'll post something.
Yep, it's census stuff, from here. Roll over states for their particulars. I think it mostly speaks for itself - the Rust Belt continues to Rusts, the Sun Belt continues to... not rust. One thing I notice about the latter, though, is that there seems to be a bit of consolidation relative to earlier decades. Whereas growth had been widespread across many southern and western states from the 70s through the 90s, it seems a bit more focused in the last ten years, mainly centering on the states associated with megaregions: the Piedmont Atlantic (Georgia and the Carolinas), the Texas Triangle (Texas), and Florida (Florida) in particular. Less urbane states in the broader region, like Tennessee or New Mexico didn't gain as much in the past decade, relatively speaking. Blip? Trend? I speculate half-heartedly, you decide.