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 6915 acres; Population 237 males, 256 females, total 493
- All the returns for this district (Festiniog) are missing
Llandecwyn Church by Dave Newbould
Rees, Thomas & John Thomas. Hanes Eglwysi Annibynnol Cymru (History of the Welsh Independent Churches), 4 volumes (published 1871+). Here is the entry from this book for Penrhyndeudreath chapel (in Welsh ) - with translation by Eleri Rowlands (June 2009)