Kilmacdonagh parish church once appeared as a neat rectangular outline on the Ordnance Survey's six-inch map of 1842, but by the time later editions of the same map were produced, the draughtsmen had replaced its footprint with the two quiet words: "site of". Today, no visible surface remains survive at all. The ground gives nothing away.

By 1615 the church was already recorded as being in ruins, meaning it had fallen out of use or into disrepair well before the 1842 survey ever tried to capture its outline. That the surveyors could still trace a rectangular form suggests some trace of walls or foundation earthworks remained into the nineteenth century, but whatever stood then has since dissolved entirely into the graveyard ground. The dedication, Kilmacdonagh, follows the common Irish pattern of naming a church-site after its founding or patron figure, with "Kil" deriving from the Irish "cill", meaning a church or monastic cell. Beyond the ruin date recorded by Brady in 1863 and the bare shape preserved on that early map, the building's history is largely unreadable now.