Location and coordinates are for the approximate centre of Llansadwrn within this administrative area. Geographic features and populated places may cross administrative borders.
Gazetteer of the British Isles (Edinburgh: Bartholomew, 1887). John Bartholomew
Llansadwrn.-- par. and vil., in E. of Anglesey, 2½ miles W. of Beaumaris, 2891 ac., pop. 382.