Location and coordinates are for the approximate centre of Trefeglwys within this administrative area. Geographic features and populated places may cross administrative borders.
Gazetteer of the British Isles (Edinburgh: Bartholomew, 1887). John Bartholomew
Trefeglwys, par., Montgomeryshire, 4 miles N. of Llanidloes, 18,166ac., pop. 1823; P.O.