Shawnee is a city in Pottawatomie County, Oklahoma, United States. The population was 31,543 in 2014, a 4.9 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.With access to Interstate 40, Shawnee is about 45 minutes east of the attractions in downtown Oklahoma City. To the east and northeast, Shawnee is 112 miles from the McClellan-Kerr Arkansas River Navigation System which provides shipping barge access to the Gulf of Mexico.