Crosthwaite and LythCrosthwaite and Lyth is a civil parish in the Westmorland and Furness district of Cumbria, England. In the 2001 census the parish had a population of 562, increasing at the 2011 census to 618.GovernanceThe village falls in the Lyth Valley electoral ward. This ward stretches south to Morecambe Bay with a total population of 2,180.