During construction of a gas pipeline between Great Britain and Ireland, a 7-metre-long prehistoric dugout was found just offshore at Gormanston Strand.

[citation needed] In 1870, the first authentic game of polo in Ireland was played on Gormanston Strand involving the 9th Lancers, who were at the time quartered in the country.

The family sold the castle in the 1950s, when it was acquired by the Franciscan Order of Friars who then established a boarding school for boys in the grounds, known as Gormanston College.

[7] According to The New Ireland Review, April 1908, legend holds that when the head of the family is in his final hours, the foxes of County Meath, except for nursing vixens, emerge from their earths and make their way to the door of Gormanston Castle to keep vigil until he has died, in thanksgiving for the deliverance and protection from marauding predators of a vixen and her young by a previous Lord Gormanston.

Gormanston underwent development in the first decade of the 21st century, including the opening of the CityNorth Business Park campus which is a mix of buildings, facilities, a hotel and services.