Killarga is an ancient place of pilgrimage and was attached to a religious settlement, Cill Fhearga, which according to the Annals of the Four Masters was founded by a holy woman, St Fearga, as early as the 6th century. There is a Holy Well, a 19th-century lime kiln, a sweat house and other historical ruins in the neighborhood. Nearby is O'Donnell's Rock, which offers far-reaching views over five counties.
The village has a school (Saint Brighid's National School), a post office, a community hall, a shop and a pub.
- Placenames Database of Ireland: Killarga/Cill Fhearga
-  Leitrim Tourism
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