The Religious census of 1851 : A Calendar of the returns relating to Wales, Vol 1, South Wales., by Jones, I.G. & Williams, D. UWP, Cardiff, 1976. These statistics for this parish or chapelry are extracted from this book which in turn got them from the 1851 census itself;
- Area 1809 acres; Population 118 males, 150 females, total 268
Places, villages, farms etc within Llangybi as shown on the online parish map from the CD of Historic Parishes of England and Wales: an Electronic Map of Boundaries before 1850 with a Gazetteer and Metadata [computer file]. (Kain, R.J.P., Oliver, R.R.). (Extracted by Gareth Hicks)
- Llangybi (72); Afon Dulas; Bwlch-wernen; Cilgwyn; Derry Ormond Sta.; Goetre; GWR Aberystwyth & Carmarthen section; Llangybi (village); Llangybi Common; Long Wood; Maes-y-forest; Nant-glas; Pen-lan;
Kelly's Directory South Wales 1895
With the kind permission of the publisher, these extracts are taken from "The History of Cardiganshire" by S R Meyrick, 1810, specifically the reprint of the 1907 imprint published by Stephen Collard in July 2000.
- "[The parish] lies in the same lordship as Bettws Bleddwrs, the property of Captain Powell, of Nant Eos."
- "The church is dedicated to Cybi, son of Selyf ab Geraint ab Erbin, a saint who founded a religious house at Holyhead about the close of the sixth century. The present incumbent is  the Rev. David Williams."