There are 3 US Post Offices in Lunenburg County serving a total of 9,490 residents equating to 3,163 residents per post office. It's estimated that approximately 15,147 packages are handled across the 3 county post offices annually. Lunenburg County is a county located in the Commonwealth of Virginia. As of the 2010 census, the population was 12,914. Its county seat is Lunenburg.