In 1887, John Bartholomew's Gazetteer of the British Isles described Treharris like this:
Treharris, near Pontypridd, Glamorgan; P.O., T.O.
Treharris through time
Treharris is now part of Merthyr Tydfil district. Click here for graphs and data of how Merthyr Tydfil has changed over two centuries. For statistics about Treharris itself, go to Units and Statistics.
GB Historical GIS / University of Portsmouth, History of Treharris, in Merthyr Tydfil and Glamorgan | Map and description, A Vision of Britain through Time.
URL: https://www.visionofbritain.org.uk/place/20474
Date accessed: 23rd April 2024
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