In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Cornwell like this:
CORNWELL, a parish in Chipping-Norton district, Oxford; 2½ miles E by N of Addlestrop r. station, and 3 W of Chipping-Norton. Post town, Chipping-Norton. Acres, 820. Real property, £1, 308. Pop., 97. Houses, 23. Cornwell House was the seat of the Pennystones. The living is a rectory in the diocese of Oxford. Value, £140. Patron, the Lord Chancellor. The church is ancient, and has a tower.
Cornwell is now part of West Oxfordshire district. Click here for graphs and data of how West Oxfordshire has changed over two centuries. For statistics about Cornwell itself, go to Units and Statistics.
GB Historical GIS / University of Portsmouth, History of Cornwell in West Oxfordshire | Map and description, A Vision of Britain through Time.
Date accessed: 26th 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 " Cornwell ".