1997-2010: The Borough of Weymouth and Portland, the District of Purbeck wards of Castle, Langton, Swanage North, Swanage South, West Purbeck, Winfrith, and Wool, and the District of West Dorset ward of Owermoigne.
2010-present: The Borough of Weymouth and Portland, the District of Purbeck wards of Castle, Creech Barrow, Langton, Swanage North, Swanage South, West Purbeck, Winfrith, and Wool, and the District of West Dorset ward of Owermoigne.