Though the castle itself has long since vanished from the landscape, careful observation reveals the grass-covered wall footings of what was likely a tower house, measuring approximately 7.9 metres north to south and 9.1 metres east to west. These remnants sit within the western quadrant of a ringfort, positioned about 80 metres from the townland boundary with Ballynagall, offering commanding views across the countryside to the east-southeast.

The castle's history emerges from historical documents rather than standing stones. The 1655-9 Down Survey map of Corkaree barony clearly depicts Loughanstown Castle standing on a hillock near the townland boundary, listed alongside Ballenegall Castle in the parish terrier. The lands belonged to Oliver Uriell, noted as an 'Irish Papist' in 1641, whose family likely descended from William Urielle, appointed as a collector for the barony in 1540. By the 19th century, antiquarian John O'Donovan could only record that a green earthen mound occupied the site where Dr Delamare's castle once stood, with the small lake that gives the townland its name lying in the adjacent field.

The true location of Loughanstown Castle has puzzled archaeologists for decades. Whilst the Westmeath Record of Monuments and Places initially marked the castle site in a field to the north-northwest, no surface evidence supports this placement. The stone structure within the nearby ringfort, with its distinctive wall footings and internal division, presents a more compelling candidate for the castle's actual remains. This confusion reflects the broader challenge of matching historical maps to modern landscapes, where centuries of agricultural use and natural erosion have obscured the footprints of Ireland's medieval strongholds.