Stilwell is a town in Adair County, Oklahoma, United States. The population was 3,276 at the 2000 census. It is the county seat of Adair County. The city is named after Arthur Stilwell, noted philanthropist and founder of Kansas City Southern Railway.
Stilwell is located at 35°48′55″N 94°37′53″W / 35.81528°N 94.63139°W / 35.81528; -94.63139 (35.815234, -94.631359).
According to the United States Census Bureau, the town has a total area of 3.2 square miles (8.3 km²), of which, 3.2 square miles (8.2 km²) of it is land and 0.04 square miles (0.1 km²) of it (0.63%) is water.