Granted in 1749, the town was named for Sir Charles Middleton, Lord Barham, who was in charge of convoy service between Barbados and the colonies. Middleton was situated on the road between Exeter and Wolfeboro, the location of Governor John Wentworth's summer home, Kingswood. Neglect of the road caused the Governor to bill the proprietors for repairs that he had to make for safe travel to Kingswood.