There are 13 US Post Offices in Gaston County serving a total of 177,853 residents equating to 13,681 residents per post office. It's estimated that approximately 283,873 packages are handled across the 13 county post offices annually. Gaston County is a county in the U.S. state of North Carolina. As of the 2010 census, the population was 206,086. The county seat is Gastonia. Dallas served as the original county seat from 1846 until 1911. Gaston County is included in the Charlotte-Concord-Gastonia, NC-SC Metropolitan Statistical Area. It is the third largest county in the metropolitan area, behind Mecklenburg County and York County, SC. It is located in the southern Piedmont region. Of North Carolina's one hundred counties, Gaston County ranks 74th in size, consisting of approximately 364.5 square miles (944 km2), and is seventh in population. The county has fifteen incorporated towns."