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.
Llanfaelrhys Parish; Statistics; Area 1679 acres; Population 129 males, 126 females, total 255
Llanfaelrhys Chapel, being an ancient Church Attendance - average - evening 35 John Evans, Minister
LLANVAELRHYS (LLAN-VAELRHYS), a parish in the hundred of COMMITMAEN, Lleyn division of the county of CARNARVON, NORTH WALES, 14 miles (S. W.) from Pwllheli, containing 258 inhabitants. This parish, which is situated on the shore of St. George's channel, at the southern extremity of the great promontory of Lleyn, is but of inconsiderable extent, and is not distinguished by any peculiarity of feature, or connected with any events of historical importance. The views embrace an extensive prospect of the adjacent country, which is finely diversified, and of the channel, by which it is bounded on the south and south-east. Manganese has been found within the parish, but no mines of it have yet been opened. The living is a perpetual curacy, annexed to the vicarage of Aberdaron, in the archdeaconry and diocese of Bangor. The church, dedicated to St. Maelrhys, is a very small edifice, and in a very dilapidated condition. There are places of worship for Independents and Calvinistic Methodists. A circulating charity school, for the gratuitous instruction of poor children, is held in the village every fourth year, in turn with the parishes of Aberdaron, Bryncroes, and Rhiw, for the support of which a tenement was bequeathed in the parish of Bryncroes. There are some small charitable donations and bequests for the relief of the poor. The average annual expenditure for the maintenance of the poor is £ 57. 18. ( A Topographical Dictionary of Wales 1833 by Samuel Lewis)
William Owen Roberts, Plas Llangwnadl Manuscripts 1793-1966 - details of extant records on Archives Network Wales "The collection consists of transcripts of the parish registers of ............. Llanfaelrhys 1812-1951 .... "