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.
Llanfachreth Parish; Statistics; Area 1887 acres; Population 284 males, 282 females, total 566
There is no Return for the Parish Church. A footnote says it has 2 services in Welsh, and accomodation of 400
Bethesda Independent Erected 1835 Attendance - morning 40, afternoon 60 scholars, evening 120 Robert Williams, Independent Minister
Capel Pont yr Arw Baptist chapel, Pontyrarw - on geograph.org.uk and graveyard and ".........the congregation........ was formed in 1787. ... original date of the chapel unknown ... rebuilt or substantially modified in 1810 and again in 1837..... enlarged in 1860 coflein
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 Llanfachreth chapel (in Welsh) - with translation
LLANVACHRETH (LLAN-VACHRETH), a parish in the hundred of TAL Y BOLION, county of ANGLESEY NORTH WALES, 3 miles (N. W. by N.) from Bodedern containing 424 inhabitants. This parish is situated in a fertile district, near the eastern shore of Holyhead bay, and is bounded on the south by the little river Alaw : it contains a considerable portion of enclosed and well-cultivated land, and formerly derived advantages from its proximity to the old Holyhead road which, since the construction of the new line of road have been materially lessened. The living is a discharged rectory, with the perpetual curacies of Llanenghenedl and Llanvigael annexed, in the archdeaconry of Anglesey, and diocese of Bangor, rated in the king's books at £ 14. 2. 1., and in the patronage of the Bishop. The church, dedicated to St. Machraeth, is an ancient structure, in the early style of English architecture, of which it exhibits some good details, and is ornamented with an east window of elegant design There are places of worship for Independents, and for Calvinistic and Wesleyan Methodists. Numerous charitable bequests have been made to the poor of this parish, but many, and the most important of them have long been lost. The average annual expenditure for the support of the poor is £ 110. 10. ( A Topographical Dictionary of Wales 1833 by Samuel Lewis)