Birkdale is an area of Southport, within the Metropolitan Borough of Sefton, Merseyside, though historically in Lancashire, in the north-west of England. The area is located on the Irish Sea coast, approximately a mile away from the centre of Southport. From 1894 to 1912, Birkdale and the adjoining suburb/village of Ainsdale were administered by Birkdale Urban District Council before becoming part of the county borough of Southport. Until 1 April 1974, Birkdale lay in the traditional borders of the county of Lancashire. At the 2001 census, the local government ward called Birkdale had a population of 12,265.