Stillwater Regional Airport is in Payne County, Oklahoma, United States, three miles (4.8 km) northwest of Stillwater.

Payne County is located in the U.S. state of Oklahoma. As of the 2020 census, its population was 81,646. Its county seat is Stillwater. The county was created in 1890 as part of Oklahoma Territory and is named for Capt. David L. Payne, a leader of the "Boomers".