In 1887, John Bartholomew's Gazetteer of the British Isles described Llantrisant like this:
Llantrisaint.-- parl. bor., par., and market town with ry. sta. (Llantrissant), Glamorgan, in SE. of co., on slope of hill, 11½ miles NW. of Cardiff and 181 W. of London - par. (containing part of Pontypridd), 17,060 ac., pop. 13,368; bor., 952 ac., pop. 1872; P.O., T.O., called Llantrissant. Market-day, Friday. Some remains exist of Llantrisaint Castle, supposed to have been destroyed in 1315 or 1404. Iron and coal are extensively worked in the neighbourhood. Llantrisaint is one of the Cardiff District of Parliamentary Boroughs, which returns 1 member.
A Vision of Britain through Time includes a large library of local statistics for administrative units. For the best overall sense of how the area containing Llantrisant has changed, please see our redistricted information for the modern district of Rhondda; Cynon; Taff. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Llantrisant and units named after it.
GB Historical GIS / University of Portsmouth, History of Llantrisant, in Rhondda; Cynon; Taff and Glamorgan | Map and description, A Vision of Britain through Time.
Date accessed: 06th December 2013
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