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
Isle of Man Railway Ballasalla the line runs over relatively flat land past the request halt at Ronaldsway to the ancient capital of Castletown. After Castletown the railway crosses the Silver Burn and heads northwest across country to the diminutive request stop at Ballabeg railway station. It then turns west for the short run to Colby, which is popular with the locals. After a request stop at the Level the train continues to Port St Mary, with views of Bradda Head and Milner's Tower on this stretch of line to Port Erin. Port Erin railway station is home to the Whistle Stop Cafe, providing