In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Treverbyn like this:
TREVERBYN, a chapelry in St. Austell parish, Cornwall; near St. Austell r. station. It was constituted in 1846. Post town, St. Austell. Pop., 2,109. Houses, 411. The living is a p. curacy in the diocese of Exeter. Value, £160. Patron, alternately the Crown and the Bishop.
Additional information about this locality is available for St Austell
GB Historical GIS / University of Portsmouth, History of Treverbyn, in Restormel and Cornwall | Map and description, A Vision of Britain through Time.
Date accessed: 25th March 2017
Click here for more detailed advice on finding places within A Vision of Britain through Time , and maybe some references to other places called " Treverbyn ".