Guymon
- County:
- Texas County
- County Seat:
- Yes
- Area (mi²):
- 7.735
- State:
- Oklahoma
Guymon is a city located in Texas County, Oklahoma. Guymon has a 2026 population of 12,397. It is also the county seat of Texas County. Guymon is currently growing at a rate of 0.23% annually but its population has decreased by -3.89% since the most recent census, which recorded a population of 12,899 in 2020.