"ITTON, a parish in the upper division of the hundred of Caldicott, county Monmouth, 3 miles N.W. of Chepstow. It includes the extra parochial liberty of Howick. The village is small, and wholly agricultural. The living is a discharged rectory in the diocese of Llandaff, value £153. The church is an ancient structure dedicated to St. Deinol."
[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.
Itton Parish consisting of Itton and Howick hamlet; Statistics; Area 1738 acres; Population 108 males, 92 females, total 200
Itton Parish Church - Attendance (average) - morning 40, afternoon 60 (alternate?) 1 service in English Joseph Camplin Prosser, Rector
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 ST493952 (Lat/Lon: 51.653246, -2.734286), Llanddinol / Itton which are provided by: