A History of Colerain Township: From Frontier Wilderness to Suburban SprawlColerain Township, located in Hamilton County, Ohio, was established in 1794. Predating the establishment of the state of Ohio in 1803, John Dunlap, a native of Coleraine, Ireland, surveyed the area. The early history of the township includes a siege on Fort Dunlap by Native American warriors for over twenty four hours. They gave up when they heard reinforcements were on their way from nearby Cincinnati's Fort Washington. After the Treaty of