​COOKSTOWN, a market town of Co. Tyrone, Ireland, in the east parliamentary division, 54 m. W. by N. of Belfast, on branches of the Great Northern and the Northern Counties (Midland) railways. Pop. of urban district (1901) 3531. It consists principally of a single street of great length, and lies in a pleasant, well-wooded district, near the Ballinderry river. It has important manufactures of linen, and some agricultural trade. It was founded in 1609, the landlord, Allan Cook, giving name to it. The mansion of Killymoon Castle, in the vicinity, is a notable example of the work of a celebrated architect, John Nash (c. 1800).