[4] The largest towns in the diocese are Carlow, Edenderry, Kildare, Naas, Newbridge, Portarlington and Portlaoise.

[5] These two dioceses continued to be separate from their foundation until 1678, when, owing to the extreme tenuity of the episcopal revenues, the bishopric of Leighlin was given in commendam by the Holy See to the Bishop of Kildare.

The Cathedral Church of the Assumption of the Blessed Virgin Mary is located in the town of Carlow.

Today with the help of an enthusiastic lay people the diocese is always busy in promoting faith of the youth in the local area.

It is dedicated to Pope John Paul II due to the strong beliefs and confidence he had in the youth of the world today.