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.
Llandegfan Parish; Statistics; Area 2760 acres; Population 474 males, 453 females, total 927
- Llandegfan Parish Church (Diocese of Bangor) Attendance - morning 77 Services in Welsh Robert Roberts, Churchwarden
- Sion, Baptist Erected 1837 Attendance - morning 105, afternoon school, evening 294 (30/50 of these are students) John Edwards, Baptist Minister, Llandegfan
- Bavachia, Calfinistig Methodist Erected 1820 House attached Attendance - (average) general congregation 287, scholars 169 John Hughes, Lewis Williams, Elders