There are 7 US Post Offices in Orange County serving a total of 34,005 residents equating to 4,858 residents per post office. It's estimated that approximately 54,276 packages are handled across the 7 county post offices annually. Orange County is a county located in the central piedmont region of the Commonwealth of Virginia. As of the 2010 census, the population was 33,481. Its county seat is Orange. Orange County is home to Montpelier, the 2,700-acre (1,100 ha) estate of James Madison, the 4th President of the United States and oft-hailed \"Father of the Constitution.\" The county celebrated its 275th anniversary in 2009."