There are 3 US Post Offices in Warren County serving a total of 36,548 residents equating to 12,183 residents per post office. It's estimated that approximately 58,335 packages are handled across the 3 county post offices annually. Warren County is a county located in the Commonwealth of Virginia. As of the 2010 census, the population was 37,575. Its county seat is Front Royal. Warren County is included in the Washington-Arlington-Alexandria, DC-VA-MD-WV Metropolitan Statistical Area."