Be careful of that though. Urban is very broadly defined by the census. I live in a 7,000 person town 40 miles outside of a major city. Myself and 2 neighbors are collectively on 75 acres and are adjacent to conservation land. This area is considered urban.
I haven’t seen recent details but as of a few years ago, there was an uptick in college educated young people moving to a handful of mostly coastal dense urban cores but the overall urbanization trend in the US was rather limited.