Cleethorpes is a seaside town on the estuary of the Humber in North East Lincolnshire, Lincolnshire, England with a population of 29,670 in 2021. It has been permanently occupied since the 6th century, with fishing as its original industry, and then developing into a resort in the 19th century. Before becoming a unified town, Cleethorpes was made up of the three small villages of Itterby, Oole and Thrunscoe.