There are 4 US Post Offices in Spotsylvania County serving a total of 71,693 residents equating to 17,923 residents per post office. It's estimated that approximately 114,430 packages are handled across the 4 county post offices annually. Spotsylvania County is a county in the U.S. state of Virginia. As of the 2015 estimate, the population was 130,475. Its county seat is Spotsylvania Courthouse. Spotsylvania County is a part of Northern Virginia and is a part of the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area."