There are 15 US Post Offices in Forsyth County serving a total of 338,671 residents equating to 22,578 residents per post office. It's estimated that approximately 540,557 packages are handled across the 15 county post offices annually. Forsyth County is a county located in the U.S. state of North Carolina. As of the 2010 census, the population was 350,670, making it the fourth-most populous county in North Carolina. Its county seat is Winston-Salem. Forsyth County is included in the Winston-Salem, NC Metropolitan Statistical Area, which is also included in the Greensboro-Winston-Salem-High Point, NC Combined Statistical Area. Parts of Forsyth County are in the Yadkin Valley wine region."