At the time of Griffith's Valuation, Castle Dargan was the property of John Ormsby and was valued at £14. McTernan writes that the Ormsbys had been in possession of the lands since the seventeenth century and had lived at the "old" castle before the building of the house.
In 1906 it was owned by John Hosie. It continued in the Hosie family until c.2004 when it was converted into a hotel and golf course. The house has been refurbished and is in use. See www.castledargan.com