There are 8 US Post Offices in Pottawatomie County serving a total of 49,371 residents equating to 6,171 residents per post office. It's estimated that approximately 78,802 packages are handled across the 8 county post offices annually. Pottawatomie County is a county located in the U.S. state of Oklahoma. As of the 2010 census, the population was 69,442. Its county seat is Shawnee. Pottawatomie County is part of the Shawnee, OK Micropolitan Statistical Area, which is included in the Oklahoma City\u2013Shawnee, OK Combined Statistical Area.