There are 11 US Post Offices in Shenandoah County serving a total of 42,545 residents equating to 3,868 residents per post office. It's estimated that approximately 67,907 packages are handled across the 11 county post offices annually. Shenandoah County (formerly Dunmore County) is a county located in the Commonwealth of Virginia. As of the 2010 census, the population was 41,993. Its county seat is Woodstock. It is part of the Shenandoah Valley region of Virginia."