There are 6 US Post Offices in Pike County serving a total of 12,275 residents equating to 2,046 residents per post office. It's estimated that approximately 19,592 packages are handled across the 6 county post offices annually. Pike County is a county located in the Southwest part of the U.S. state of Indiana. As of 2010, the population was 12,845. The county seat is Petersburg. It contains the geographic point representing median center of population of the United States. Pike County is part of the Jasper Micropolitan Statistical Area."