Shawnee is a city in Pottawatomie County, Oklahoma, United States. The population was 29,857 at the 2010 census, a 4.0 percent increase from 28,692 at the 2000 census. The city is part of the Oklahoma City-Shawnee Combined Statistical Area; it is also the county seat of Pottawatomie County and the principal city of the Shawnee Micropolitan Statistical Area.