Explored 1541 on behalf of Spain by Francisco De Coronado. Visited by Texans early as the 1840's. Mapped by U.S. Army expedition of Capt. Randolph Marcy, 1849.
Yielded salt for use of early settlers and hunters. Was site of buffalo hunters' capital, Rath City, 1876-1879.
County created in 1876, organized 1888. Named in honor of Confederate General Thomas Johathan "Stonewall" Jackson (1824-1863), whose courage and fighting skill inspired Texas soldiers in the Civil War.
First county seat, Rayner, replaced 1898 by Aspermont, named for high location.