MEXBOROUGH, an urban district in the West Riding of Yorkshire, England, on the Don, 11 m. N.E. of Sheffield on the Great Central and Midland railways. Pop. (1891), 7734; (1901), 10,430. The Don affords water communication with the Humber. The church of St John the Baptist has Early English portions. The large industrial population is mainly employed in glass, pottery and iron works, and in the neighbouring stone-quarries. The Castle Hill is crowned with some fine earthworks of uncertain date.