"MOUNTON, a parish in the upper division of Caldicott hundred, county Monmouth, 1 mile S.W. of Chepstow, its post town. The parish, which is of small extent, is situated on a small rivulet which runs into the Bristol Channel at the mouth of the Severn. The village consists of a few farmhouses. The living is a perpetual curacy in the diocese of Llandaff, value £87. There is a place of worship for Wesleyans."
[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.
Mounton Parish; Statistics; Area 407 acres; Population 31 males, 36 females, total 67
Mounton Parish Church Attendance - morning 20, afternoon 20 1 service in English Informant; Chrs Davis
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 ST512931 (Lat/Lon: 51.634534, -2.706530), Mounton which are provided by: