Thornton is a village in the Metropolitan Borough of Sefton, in Merseyside, England. Within the boundaries of the historic county of Lancashire and situated to the north east of Crosby, it is a residential area of semi-detached and detached housing which dates mainly from the 1930s. Many of the houses, particularly those around Edge Lane and Water Street, feature notably long gardens. The A565 Liverpool-Southport road serves the area. At the 2001 Census the population of the village and civil parish was recorded as 2,262, falling to 2,139 at the Census 2011.