"GWERNESNEY, a parish in the upper division of the hundred of Usk, county Monmouth, 12 miles N.E. of Usk. The parish, which is of small extent, is situated on the new road leading from Usk to Chepstow, and near Olway Brook. The living is a rectory in the diocese of Llandaff, value £112."
[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 established after 1851.
Gwernesney Parish; Statistics; Area 543 acres; Population 29 males, 24 females, total 53
Gwernesney Parish Church - Attendance - morning 18 1 service in English James Blower, Curate
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 SO415017 (Lat/Lon: 51.710925, -2.848114), Gwernesni / Gwernesney which are provided by: