In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Tregare like this:
TREGARE, a parish in the district and county of Monmouth; 1½ mile NNW of Raglan-Footpath r. station, and 6¼ W by S of Monmouth. Post town, Raglan, under Newport, Monmouth. Acres, 2,387. Real property, £2,825. Pop., 319. Houses, 69. The property is much subdivided. The living is a p. curacy, annexed to Dingestow. The church is old but good. Charities, £24.
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 Tregare 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 Tregare and units named after it.
GB Historical GIS / University of Portsmouth, History of Tregare in Monmouthshire | Map and description, A Vision of Britain through Time.
Date accessed: 17th September 2014
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Tregare".