There are 12 historical baronies in the County of Westmeath.

Republic of Ireland	Carlow Cavan Clare Cork Donegal Dublin Dún Laoghaire–Rathdown Fingal South Dublin City Galway Kerry Kildare Kilkenny Laois Leitrim Limerick Longford Louth Mayo Meath Monaghan Offaly Roscommon Sligo Tipperary Waterford Westmeath Wexford Wicklow
Northern Ireland	Antrim Armagh Down Fermanagh Londonderry Tyrone