Many major cities have started seeing growth again. But it's usually still below the nationwide growth, and the growth seen in the suburbs, so they'll generally lose CDs again. You mention how DC grew 5%, the first time it's seen growth in a long time. Notable, but the nation grew 10%. If it were part of Maryland or Virginia, a DC-based district would have had to expand into the suburbs.
Yes, but it's usually worse than this.
D.C. has pretty much a fixed boundary and was already pretty well built-up, but what about other big cities?
Somebody said that Louisville and Lexington together now make up a much larger proportion of Kentucky's population (even if you adjust Louisville for merging with the county). I'm wondering how close it'll be to bringing Kentucky back into the Democratic column.