There are 5 US Post Offices in Boone County serving a total of 37,235 residents equating to 7,447 residents per post office. It's estimated that approximately 59,431 packages are handled across the 5 county post offices annually. Boone County is a county located in the U.S. state of Arkansas. As of the 2010 census, the population was 36,903. The county seat is Harrison. It is Arkansas's 62nd county, formed on April 9, 1869. Boone County is part of the Harrison, AR Micropolitan Statistical Area."