HEYDON, a small well-built town in the east riding of Yorkshire, in that part called Holderness, seated on a river that falls into the Humber. It has now but one church, though there are the remains of two more; and had formerly a considerable trade, which is now lost, on account of its being so near Hull. It sends two members to parliament. Population 780 in 1811. W. Long. o. 55. N. Lat. 53. 46.