Location and coordinates are for the approximate centre of Castleside within this administrative area. Geographic features and populated places may cross administrative borders.
Gazetteer of the British Isles (Edinburgh: Bartholomew, 1887). John Bartholomew
Castleside, eccl. dist. (St John) and hamlet, Lanchester and Muggleswick pars., N. Durham, pop. 852. The hamlet is in Lanchester par.; P.O.