Smart Growth America reports on the trending popularity of cities in a new light with an article you can read here.
Urbanists and demographic researchers have been watching and charting for several years the re-growth of cities, but SGA points out that even small cities are outpacing their suburban areas.
Some smaller cities are even growing faster than the largest metro areas.
The success of small cities like Clarksville, Tenn. has depended largely on smart-growth plans, specifically complete-street development, which you can read more about here.
And here's BikePGH's take on it.