- Guymon is a city located in Oklahoma, United States. It is the county seat of Texas County and has a population of approximately 11,442 people as of 2019. The city is situated in the Oklahoma Panhandle and is known for its agricultural industry, particularly in the production of cattle, wheat, and corn. Guymon is also a hub for the oil and gas industry and has experienced growth in recent years due to the development of wind energy. The city offers a range of amenities, including schools, parks, and recreational facilities, as well as a vibrant community with cultural events and festivals.