Northumbria Police is a territorial police force in England. It is responsible for policing the metropolitan boroughs of Newcastle upon Tyne, Gateshead, North Tyneside, South Tyneside and the City of Sunderland, as well as the ceremonial county of Northumberland. It is the largest police force in the North East by geographical area and number of officers. The force covers an area of 2,141 square miles (5,550 km2) with a population of 1.46 million.