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.
Llanystymdwy Parish; Statistics; Area 6780 acres; Population 577 males, 629 females, total 1206
- Llanystumdwy Parish Church Attendance - average - morning 100, afternoon 40 Services in Welsh John Hughes, Rector
- Tabernacle, Independent Erected c 1831 Attendance - morning 33, afternoon 34, evening 101 William Roberts, Independent Preacher
- Bontfechan, Calvinistic Methodists Erected 1804 Attendance - morning 132, afternoon 111 scholars, evening 110 Robert Roberts, Deacon, Pen y bryn
- Rhoslan Chapel, Congregational Erected 1811 Attendance - morning 65 scholars, afternoon 141, evening 100 William Ellis, Deacon, Hendre Llansdundwn
- Capel y Beirdd, Particular Baptists Erected 1821 Attendance - morning 22 + 3 scholars, afternoon 49 scholars, evening 93 John Williams, Baptist Minister, nr Dolbelmaen