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 1658 acres; Population 130 males, 146 females, total 276
Places, villages, farms etc within Tre-main 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)
- Tremain (98); Blaen-pistyll; Canllefaes; Ffynnonwen; Lleinau; Nant-y-llan; Pen-rhiw; Trefwtial; Tremain (village); Tre-feredd; Tre-Prior
Description of the parish of Tre-main from A Topographical Dictionary of Wales (1833) by Samuel Lewis.
Kelly's Directory South Wales 1895