Liverpool is a city and metropolitan borough in North West England, with an estimated population of 491,500. Its metropolitan area is the fifth-largest in the UK, with a population of 2.24 million in 2011. The local authority is Liverpool City Council, the most populous local government district in the metropolitan county of Merseyside and the largest in the Liverpool City Region.
Liverpool is on the eastern side of the Mersey Estuary, and historically lay within the ancient hundred of West Derby in the south west of the county of Lancashire. It became a borough in 1207 and a city in 1880. In 1889, it became a county borough independent of Lancashire.