In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Tredunnock like this:
TREDUNNOCK, a parish in Newport district, Monmouth; 4¼ miles S of Usk r. station. Post town, Llan-gibby, under Newport, Monmouth. Acres, 1,393. Real property, £1,606. Pop., 164. Houses, 32. The property is divided among a few. The living is a rectory in the diocese of Llandaff. Value, £208.* Patron,H. Leigh, Esq. The church is good.
Tredunnock is now part of Monmouthshire district. Click here for graphs and data of how Monmouthshire has changed over two centuries. For statistics about Tredunnock itself, go to Units and Statistics.
GB Historical GIS / University of Portsmouth, History of Tredunnock in Monmouthshire | Map and description, A Vision of Britain through Time.
Date accessed: 27th April 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 " Tredunnock ".