sentences:  Northern Ireland's capital city Belfast is 68 miles (109.5 km) to the east of Omagh, and Derry is 34 miles (55 km) to the north.The town had a population of 19,659 at the 2011 Census, and the former district council, which was the largest in County Tyrone, had a population of 51,356.Omagh contains the headquarters of the Western Education and Library Board, and also houses offices for the Department of Agriculture and Rural Development at Sperrin House, the Department for Regional Development and the Northern Ireland Roads Service at the Tyrone County Hall and the Northern Ireland Land & Property Services at Boaz House.