Castletown is geographically located at latitude 54° 5' 24" North of the Equator and longitude 4° 39' 0" West of the Prime Meridian on the Map of World. The following locations related to it are represented by the line of sight between two points and may not be nearest by road.

Queens Hotel, Dundee is about 322.1km, The Trout Inn, Oxford (England) is about 452.2km. These are places to stay (hotel, service apartment, inn) located near Castletown.

Hardknott Pass (England) is about 165.8km, Bettystown Beach (Meath) is about 182.5km, Bidston Hill (England) is about 191.5km, Dumgoyne Ascent (Scotland) is about 217.7km, Dumgoyne (Scotland) is about 217.7km. These are parks, playgrounds, open fields or commons located near Castletown.