Castletown, Isle of Man House of Keys moved from Castletown to Douglas. The Isle of Man Census 2011 lists the town's population as 3,097 (2006: 3,109) It is the fourth largest town on the island, after Douglas, Ramsey and Peel, but is also smaller than Onchan and Port Erin, which have the status of villages. The town lies on the northwest side of Castletown Bay. The opposite shore of the bay is the west coast of the distinctively-shaped Langness Peninsula. To the north-east are Ronaldsway Airport and industrial zone, and the village of Ballasalla; to the north-west the villages of Ballabeg and Colby; and
Ballabeg Ballabeg derives from the Manx which means small homestead; although the spelling is different, it is pronounced approximately the same as the English name. Nearby is the "Ball and Bag", a free house which was built by Sir David Mark Jordan, a Victorian army captain who settled there upon his retirement. It also has Arbory Primary School, serving the villages of Ballabeg and Colby, as well as the outlying areas. The parish church has a large churchyard with many graves dating back at least to the mid-18th century, although there has been a church on the site for much longer.