Oh God now we're gonna get RINO Tom coming in here to tell us about how Jefferson County, Missouri; Livingston County, MI; and Berks County PA are all just as suburban as Chester, PA; Cobb, GA; and Orange, CA.
Why would they not be? If anything the latter counties you mentioned are becoming more urban, with the exception of Chester.
It depends. To a Californian, suburban means single family homes on a grid and apartments under 4 stories, semi-walkable strip mall, and a density of 10,000 ish people per square mile. To an Atlantan, urban means a handful of office-park style skyscrapers scattered amongst single family homes that seem like they're in the middle of a forest. To me, urban means miles and miles of 7 story apartment buildings, decent rapid transit, and densities exceeding 20,000 people per square mile.