There are 4 US Post Offices in Louisa County serving a total of 38,068 residents equating to 9,517 residents per post office. It's estimated that approximately 60,761 packages are handled across the 4 county post offices annually. Louisa County is a county located in the Commonwealth of Virginia. As of the 2010 census, the population was 33,153. The county seat is Louisa."