The Okarche post office was established June 28, 1890. Cheyenne and Arapaho lands were opened to settlement by land run on April 19, 1892. The town was incorporated in 1905 – two years before statehood. The name of the town is derived from parts of three words, Oklahoma (OK), Arapaho (AR), and Cheyenne (CHE). The Southern Arapaho and Cheyenne Native American tribes had been relocated to Oklahoma from the northern Great Plains in the late 19th century. The town's population hovered in the 400s for more than three decades after statehood had risen to over 1,200 by 2010.