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.
Rhoscolyn Parish; Statistics; Area 2580 acres; Population 243 males, 245 females, total 488
- Rhoscolyn Parish Church (Diocese of Bangor) Attendance - usual - morning 25 scholars, afternoon 50 Informant; Wm Williams
- Zion Chapel, Calvinistic Methodists Erected 1800 Attendance - morning 162, afternoon 67 scholars, evening 142 Hugh Williams, Elder, Pwllpreban, Rhoscolyn
- Sardis, Baptist Erected 1828 Attendance - morning 100, evening 200 Thomas Evans, Baptist Minister
- Boat Chapel, Wesleyans Erected 1806 Attendance - morning 45, afternoon 70, evening 60 William Roberts, Steward, Cae'r Sais