A demographer at the University of Georgia, Doug Bachtel, said populations are moving outward from the central city as residents move to inexpensive areas with better school systems. They're willing to put up with the traffic and sprawl that comes with life miles from the city. (...) The four counties in the metro Atlanta area are Forsyth, Henry, Newton and Paulding, whose populations have grown from 23 percent to 26 percent from April 2000 to July 2003. The other fast-growing Georgia county is Chattahoochee, where Fort Benning is located.