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Guymon, city, seat (1907) of Texas county, northwestern Oklahoma, U.S. It lies on the high plains of the Panhandle, near the North Canadian River. Originally called Sanford, it was founded by E.T. Guymon, a grocer and land speculator, in 1901 on the arrival of the Rock Island Railroad. The city is a trading centre for an irrigated agricultural and gas and oil region centred in the huge Guymon-Hugoton gas field. There are pipeline facilities and...