There are 9 US Post Offices in Caroline County serving a total of 27,786 residents equating to 3,087 residents per post office. It's estimated that approximately 44,350 packages are handled across the 9 county post offices annually. Caroline County is a United States county located on the Eastern part of the Commonwealth of Virginia. The Northern boundary of the county borders on the Rappahannock River, notably at the historic town of Port Royal. The Caroline county seat is Bowling Green. Caroline County was established in 1728 and was named in honor of Caroline of Ansbach, wife of the then reigning King, George II of Great Britain. It is the birthplace of the renowned racehorse Secretariat, winner of the 1973 Kentucky Derby, Preakness Stakes and Belmont Stakes; the Triple Crown. As of the 2010 census, the county population was 28,545, having more than doubled in the last fifty years. Caroline is part of the Greater Richmond Region."