In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Rockfield like this:
ROCKFIELD, a parish, with a village, in the district and county of Monmouth; on the river Monnow, 2¾ miles N W of Monmouth r. station. It has a post-office under Monmouth. Acres, 1, 993. Real property, £2, 429. Pop., 270. Houses, 56. The property is much sub-divided. R. House is a chief residence. The parish is a meet for the Monmouthshire hounds. The living is a vicarage in the diocese of Llandaff. Value, not reported. Patron, Sir J. D. Harding. The church is good.
A Vision of Britain through Time includes a large library of local statistics for administrative units. For the best overall sense of how the area containing Rockfield has changed, please see our redistricted information for the modern district of Monmouthshire. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Rockfield and units named after it.
GB Historical GIS / University of Portsmouth, History of Rockfield in Monmouthshire | Map and description, A Vision of Britain through Time.
Date accessed: 20th January 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 "Rockfield".