North Charleston is the third largest city in the State of South Carolina with incorporated areas in Berkeley, Charleston, and Dorchester counties. On June 12, 1972 the city of North Charleston incorporated and was the 9th largest city in South Carolina. According to the 2010 Census, North Charleston has a 2012 population estimate of 101,989 with a current area of more than . As defined by the U.S. Office of Management and Budget, for use by the U.S. Census Bureau and other U.S. Government agencies for statistical purposes only, North Charleston is included within the Charleston–North Charleston–Summerville metropolitan area and the Charleston-North Charleston urban area. North Charleston is one of the state's major industrial centers and is the state's top city in gross retail sales.