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Your Ad Here DeKalb County, Georgia DeKalb County is a county located in the U.S. state of Georgia. In a 2006 U.S. Census Bureau estimate, the county's population was estimated at 723,602. The county seat is Decatur. History DeKalb County was created in 1822 from Henry, Gwinnett and Fayette Counties. It was named for Baron Johann de Kalb, a German soldier who fought on the side of the Americans in the American Revolutionary War. ![]() |