The Darlington Agency was an Indian agency on the Cheyenne and Arapaho Indian Reservation in Canadian County, Oklahoma. The agency was established in 1870, when the agency established at Fort Supply the previous year was moved to a more accessible location for the tribes. Brinton Darlington, a Quaker for whom the agency was named, was the first agent at the agency, a position he held until his death in 1872. The agency gained a post office and an Indian school run by John Homer Seger, and it became a stop on the Chisholm Trail. By 1880, the agency had its own newspaper, the Cheyenne Transporter; it was the first in western Oklahoma. The Cheyenne left to form their own agency at Concho in 1897; when the Arapaho reunited with them, they both occupied the Concho agency, and the Darlington Ag