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.
Llanddyfnan Parish; Statistics; Area 3506 acres; Population 344 males, 385 females, total 729
- Llanddyfnan Parish Church (Diocese of Bangor) Attendance - (average) afternoon 149 Services in Welsh W Williams, Rector, Pentraeth
- Siloam, Independent Erected 1841 Attendance - morning 65, afternoon 45, evening 23 John Thomas, Deacon, Tyn yr efel
- Talwern, Calvinistic Methodists Erected 1805 Not used exclusively as a place of worship Attendance - morning 103, afternoon 132 scholars, evening 219 John Prytherch, Minister, Dyffryn, Llangefni