In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Porth like this:
PORTH, a railway station with telegraph in Glamorgan; on the Rhondda branch of the Taff Vale railway, 3¼ miles W N W of Pontypridd.
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 Porth 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 Porth and units named after it.
GB Historical GIS / University of Portsmouth, History of Porth, in Rhondda; Cynon; Taff and Glamorgan | Map and description, A Vision of Britain through Time.
Date accessed: 26th November 2015
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Porth".