There are 2 US Post Offices in Craig County serving a total of 4,401 residents equating to 2,201 residents per post office. It's estimated that approximately 7,024 packages are handled across the 2 county post offices annually. Craig County is a county located in the Commonwealth of Virginia. As of the 2010 census, the population was 5,190. Its county seat is New Castle. Craig County is part of the Roanoke, VA Metropolitan Statistical Area.