There used to be a similar thread here, but I have no idea what happened to it so I'm starting another one.
It appears that Charlotte has overtaken Memphis to be the nation's 18th largest city according the Census estimates for cities which were recently released. Charlotte went from 669,205 in 2007 to 687,456 in 2008.
In last year's estimates, Rock Hill regained its place as the region's 3rd largest city and has retained that spot. If current trends continue, I suspect it won't be long before it overtakes Gastonia to become the region's 2nd largest city as only 5K residents separate them (Rock Hill's 67,339 to Gastonia's 72,505). Concord stands at 66,311.