Sion Mills is a village to the south of Strabane in County Tyrone, Northern Ireland, on the River Mourne. In the 2001 Census it had a population of 2,050 people. It is a tree-lined industrial village and designated conservation area, particularly rich in architectural heritage.The village of Sion Mills was established by the Herdman family in 1835. The family operated a linen production mill in the village.