1918-1950: The Municipal Boroughs of Wareham, and Weymouth and Melcombe Regis, the Urban Districts of Portland and Swanage, the Rural District of Wareham and Purbeck, and the part of the Rural District of Weymouth that was not included in the Dorset West constituency (i.e. Bincombe, Broadwey, Chickerell, Fleet, Osmington, Owermoigne, Poxwell, Preston, Radipole, Upwey and Wyke Regis).