Defynnog was a large upland parish in Victorian times. It included Cray, Maescar, Senni, and Glyn. Later in the 19th century the parish was divided up but we have given the figures for the whole area so that we can compare like with like.
The government report which published the figures for 1841 said that the population of Defynnog had decreased due to the "removal of several families to the vicinity of the ironworks of Merthyr, Dowlais and Rumney". Notice that the population went back up again in 1851.

Compare this graph with those of other rural parishes in the area like Llanfrynach and Llandeilo'r Fan.
Is the overall trend the same?
If the trend differs, in what way does it differ?

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