"CAERWENT, a parish in the upper division of the hundred of Caldicott, in the county of Monmouth, 5 miles to the S.W. of Chepstow, its post town. It is not far from the South Wales railway and the river Severn, and contains the hamlet of Crick. Caerwent is a very ancient place, and was the site of the Roman station called Venta Silurum, on the Via Julia. Parts of the walls still remain. They are from 9 to 12 feet thick, and enclose an area of 505 by 390 yards." [Description(s) from The National Gazetteer of Great Britain and Ireland (1868)
Church and chapel data from The Religious census of 1851 : A Calendar of the returns relating to Wales, Vol 1, South Wales. Ed. by I.G Jones, & D. Williams. UWP, Cardiff, 1976. The names given towards the end of each entry are those of the informants. Check with Gwent RO to see what extant records are held, and possible names of chapels/churches built after 1851.
Caerwent parish consisting of Caerwent and the hamlet of Dinham - Statistics; Area 1962 acres; Population 205 males, 215 females, total 420
St John's [? see below] Caerwent Parish Church - Attendance - morning 70+30 scholars, afternoon 80 2 services in English Informant; James White, Registrar
The Baptist Chapel, Caerwent - Erected 1815 Attendance - morning 42+20 scholars, afternoon 27 scholars, evening 74 A day school is kept in it John Walter Morgan, Minister
Family Search have an interactive map called "England and Wales Jurisdictions 1851" showing parish (and other) boundaries with optional background maps such as Ordnance Survey. There is also a Search facility, do read the guidance notes to get maximum benefit from this useful resource. See here for further background information to assist in the interpretation of this data
Kain, R.J.P., Oliver, R.R., Historic Parishes of England and Wales: an Electronic Map of Boundaries before 1850 with a Gazetteer and Metadata [computer file]. Colchester, Essex: History Data Service, UK Data Archive [distributor], 17 May 2001. SN: 4348. Here is a gazetteer/finding aid plus a set of overview maps to accurately identify the position of parishes within the county.
You can see maps centred on OS grid reference ST468904 (Lat/Lon: 51.609906, -2.769658), Caer-Went / Caerwent which are provided by: