Geographicially, Ireland is divided into four provinces, Connaught, Leinster, Munster and Ulster. It is also divided into four Archdioceses, containing 26 dioceses, according to the Roman Catholic church. For all Pioneer activities, these dioceses are grouped along the bounderies of the geographical provinces.

Each province is sub divided into Dioceses. These Dioceses are as follows:-

Connaught

Achonry
Clonfert
Elphin
Galway, Kilmacduagh & Kilfenora
Killala
Tuam

Leinster

Ardagh & Clonmacnois
Dublin
Ferns
Kildare & Leighlin
Meath
Ossory

Munster

Cashel & Emly
Cloyne
Cork & Ross
Kerry
Killaloe
Limerick
Waterford & Lismore

Ulster

Armagh
Clogher
Derry
Down&Connor
Dromore
Kilmore
Raphoe