Pioneers settling Bull Creek, 1888, where herds of bull buffalo grazed, called their community Bison. They founded the Baptist Church on the creek bank, the school in a nearby pasture. Bison was located on fringe of the ranch belonging to A. P. Bush and Benjamin Tillar, both prominent early Texas cattlemen. In 1890, name of town and post office (then housed in a dugout) became "Knapp" after the U.S. Post Office Department refused Bison because it was a duplicate name. In 1959, after a rousing decade of serving the oil boom workers, the post office closed. (1967)