High Quality Content by WIKIPEDIA articles! Stillwater is a city in and the county seat of Payne County, Oklahoma, United States. The population was 39,065 at the 2000 census. Founded December 12, 1884 it was the first settlement in the Unassigned Lands. The geographical position of Stillwater is located Northeast of the Oklahoma City Metropolitan Area though many consider it to be a satellite exburb of Oklahoma City, due to commuter patterns and other indicators. The city of Stillwater is marketing a new census for 2010, implementing a program named "Count Stillwater" to help utilize the students of Oklahoma State University to increase the official population.