"LLANDENNY, a parish in the lower division of the hundred of Ragland, county Monmouth, 3 miles N.E. of Usk, its post town, 3 S. of Ragland, and 9 from Monmouth. It is traversed by the Olway brook and the Monmouthshire line of railway, which has a station here. It is a small agricultural village. The living is a vicarage in the diocese of Llandaff, value £50. The church is dedicated to St. John. The parochial endowments produce about £45 per annum, besides six cottages for the poor."
[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.
Llandenny Parish; Statistics; Area 2228 acres; Population 199 males, 198 females, total 397
Llandenny Parish Church Attendance - morning 33 +12 scholars, afternoon 63 2 services in English Augustin Williams, 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 SO415039 (Lat/Lon: 51.730704, -2.848485), Llanddenni / Llandenny which are provided by: