Founded and designated county seat in 1905, same year county was organized. Took name from Seminole Wells, Indian watering places to south and west. First store and post office were established in 1905 by W. B. Austin of nearby Caput. The courthouse was built in 1906. Seminole grew slowly, being chiefly important as a trading center. Arrival of the Midland & Northwestern Railroad (1918) and development of highways and oil resources all helped seed the town's later expansion. Today it is a business center for farming and petroleum industry. (1970)