The graveyard at Coghlanstown sits within what appears to be the south-western portion of an early ecclesiastical enclosure, and its outline alone tells a quiet story. The boundary wall encloses a roughly D-shaped area, approximately 46 metres across from north to south, with an unusually straight northern edge running about 47 metres east to west. That straight edge is a clue: curvilinear or D-shaped enclosures with one flattened side are a recognised feature of early Irish Christian settlements, where the curved perimeter often preserves the line of a much older boundary, sometimes pre-dating the medieval church itself.

The church standing just north of centre within the enclosure retains a font and a memorial cross, and elsewhere in the graveyard there is a cross base, the kind of heavy stone socket that would once have anchored a freestanding carved cross. Such bases are common survivals from early medieval ecclesiastical sites, where the cross itself has long since been lost or moved. Immediately to the west, just outside the enclosure wall, lies a holy well, another feature frequently associated with early Christian foundations in Ireland, often marking a site of veneration that predates the formal church structure beside it. The legible burial markers within the graveyard date from the eighteenth to the twentieth century, though the concentration of burials to the south of the church follows a pattern seen across early Irish ecclesiastical sites, where the south side was traditionally the favoured ground. The site was noted by Fitzgerald in a survey published between 1912 and 1914.