Location and coordinates are for the approximate centre of Llanfflewyn within this administrative area. Geographic features and populated places may cross administrative borders.
Gazetteer of the British Isles (Edinburgh: Bartholomew, 1887). John Bartholomew
Llanfflewyn, par., Anglesey, in NW. of co., 8 miles NE. of Holyhead, 1265 ac., pop. 79.