Castlecomer is a former coal mining town in County Kilkenny, Ireland, located in the province of Leinster. The town is positioned at the meeting of N78 and R694 roads about 16 km (9.9 mi) roads north of Kilkenny city in the southeast of the island of Ireland.At the 2011 census, by the Central Statistics Office, the 30.5 square kilometre Electoral District area of Castlecomer had a population was 2,293, with a population density of 75.2 persons per square kilometre.