Muckno is also the name given to the Catholic parish (St. Mary's, Castleblayney, and St Patrick's, Oram, just three miles north-east of the town), which is part of the Diocese of Clogher. The Church of Ireland parish is also called Muckno (St Maeldoid's), and is part of the Church of Ireland Diocese of Clogher. The Parish of Muckno covers most of the areas around the lough and town. Originally the Parish of Muckno was restricted to the area to the east and north of the lake and the Derrycreevey River, i.e. the Oram area. With the establishment of the Church of Ireland church and the Blayney seat on the southern side of the lake, the area of the new town became part of Muckno. The Catholic parish followed a similar pattern at the end of the Penal Laws period. Prior to this, the area now covered by the town was part of Clontibret parish.