Church and chapel data from The Religious census of 1851 : A Calendar of the returns relating to Wales, Vol 11, North Wales. Ed. by Ieuan Gwynedd Jones, UWP, 1981. The names given towards the end of each entry are those of the informants.
Parish statistics; Area 3784 acres; Population 246 males, 245 females, total 491
- Llanwyddelan Parish Church Attendance - morning 20 + 7 scholars, afternoon 28 Morning services in English, afternoon in Welsh "..........the Church is situated at one extremity of the parish away from the mass of the population" J McIntosh, Rector
- Adfa Chapel, Welsh Calvinistic Methodists Erected c 1790 Attendance - morning 175, afternoon 193 scholars, evening 235 Robert Davies, Minister
Church of St Gwyddelan, Llanwyddelan on the Montgomeryshire Churches Survey site
Details of extant records on Archives Network Wales for the following;
- Adfa Calvinistic Methodist Chapel, historical notes 1992- "Adfa Calvinistic Methodist Chapel, near Llanwyddelan, Montgomeryshire, was established in 1742. The chapel was built in about 1790"