Horsforth is an affluent town and civil parish within the City of Leeds metropolitan borough, in West Yorkshire, England, lying to the north west of Leeds. Historically within the West Riding of Yorkshire, it has a population of 18,928.Horsforth was considered to have the largest population of any village in the United Kingdom during the latter part of the 19th century. It became part of the City of Leeds metropolitan borough in 1974, and became a civil parish with town council in 1999.