There are 5 US Post Offices in Orange County serving a total of 20,991 residents equating to 4,198 residents per post office. It's estimated that approximately 33,504 packages are handled across the 5 county post offices annually. Orange County is located in southern Indiana in the United States. As of 2010, its population was 19,840, an increase of 2.8% from 19,306 in 2000. The county seat is Paoli. The county has four incorporated settlements with a total population of about 8,600, as well as several small unincorporated communities. It is divided into 10 townships which provide local services. One U.S. route and five Indiana state roads pass through or into the county."