1918-1950: The Municipal Boroughs of Lancaster and Morecambe, the Urban Districts of Heysham and Preesall, the Rural District of Garstang, and part of the Rural District of Lancaster.
1983-1997: The City of Lancaster wards of Bulk, Castle, Caton, Ellel, Hornby, John O'Gaunt, Scotforth East, Scotforth West, Skerton Central, Skerton East, and Skerton West, and the Borough of Wyre wards of Brock, Calder, Catterall, Duchy, Garstang, Great Eccleston, Pilling, and Wyresdale.