Crosby is a coastal town in the Metropolitan Borough of Sefton, Merseyside, England. Historically in Lancashire, it is north of Bootle, …Crosby is a coastal town in the Metropolitan Borough of Sefton, Merseyside, England. Historically in Lancashire, it is north of Bootle, south of Southport and Formby, and west of Netherton. It abuts the areas of Blundellsands to the north and Waterloo to the south. It is approximately 6 miles north of Liverpool City Centre.