Barrow-in-Furness is a port town and civil parish in the Westmorland and Furness district of Cumbria, England. Historically in Lancashire, it was incorporated as a municipal borough in 1867 and merged with Dalton-in-Furness Urban District in 1974 to form the Borough of Barrow-in-Furness. The borough was merged into the new Westmorland and Furness district in 2023. At the tip of the Furness peninsula, close to the Lake District, it is bordered by Morecambe Bay, the Duddon Estuary and the Irish Sea. In 2021, Barrow's population was 55,489, making it the second largest urban area in Cumbria after Carlisle, and the largest in the Westmorland and Furness unitary authority.