Glencoe is a town in northern Payne County, Oklahoma, United States. The population was 601 at the 2010 census, an increase of 3.1 percent from 583 at the 2000 census. Glencoe is a midway point between Pawnee County and Stillwater, Oklahoma, which is the county seat. The city has recently been the site of economic growth due to positive investments in agritourism and athletic achievements.