Rhennir Iwerddon yn 32 o siroedd traddodiadol (gyda 26 yn y Weriniaeth a 6 yn y gogledd ) a 4 talaith .

Y Taleithiau [ golygu | golygu cod ]

Ulaidh - Ulster		An Mhumhain - Munster
Connachta - Connacht		Laighin - Leinster

Map o'r siroedd [ golygu | golygu cod ]

Sylwer nad yw'r siroedd hyn yn cyfateb ym mhob achos i'r unedau gweinyddol presennol.

Gweriniaeth Iwerddon Ath Cliath - Dublin* Cill Mhantain - Wicklow Loch Garman - Wexford Ceatharlach - Carlow Cill Dara - Kildare An Mhi - Meath Lu - Louth Muineachan - Monaghan An Cabhan - Cavan An Longfort - Longford An Iarmhi - Westmeath Uibh Fhaili - Offaly Laois - Laois Cill Chainnigh - Kilkenny Port Lairge - Waterford Corcaigh - Cork Ciarrai - Kerry Luimneach - Limerick Tiobraid Arann - Tipperary An Clar - Clare Gaillimh - Galway Maigh Eo - Mayo Ros Comain - Roscommon Sligeach - Sligo Liatroim - Leitrim Dun na nGall - Donegal

Gogledd Iwerddon Fear Manach - Fermanagh Tir Eoghain - Tyrone Doire - Derry/Londonderry Aontroim - Antrim An Dun - Down Ard Mhacha - Armagh

Rhestr yn nhrefn yr wyddor [ golygu | golygu cod ]

Swydd Enw Gwyddeleg	Swydd Enw Saesneg	Prif Dre Enw Gwyddeleg	Prif Dre Enw Saesneg	Talaith	Sofraniaeth
Aontroim Contae Aontroma	Antrim County Antrim	Aontroim	Antrim
Ard Mhacha Contae Ard Mhacha	Armagh County Armagh	Ard Mhacha	Armagh
Ath Cliath* Contae Atha Cliath	Dublin* County Dublin	Ath Cliath	Dublin
Atha Cliath Theas* Contae Atha Cliath Theas	South Dublin* County of South Dublin	Tamhlacht	Tallaght
An Cabhan Contae an Chabhain	Cavan County Cavan	An Cabhan	Cavan
Ceatharlach Contae Cheatharlach	Carlow County Carlow	Ceatharlach	Carlow
Ciarrai Contae Chiarrai	Kerry County Kerry	Tra Li	Tralee
Cill Chainnigh Contae Chill Chainnigh	Kilkenny County Kilkenny	Cill Chainnigh	Kilkenny
Cill Dara Contae Chill Dara	Kildare County Kildare	Nas na Riogh	Naas
Cill Mhantain Contae Chill Mhantain	Wicklow County Wicklow	Cill Mhantain	Wicklow
An Clar Contae an Chlair	Clare County Clare	Innis	Ennis
Corcaigh Contae Chorcai	Cork County Cork	Corcaigh	Cork
Doire Contae Dhoire	Derry County Derry/Londonderry	Doire	Derry
An Dun Contae an Duin	Down County Down	Dun Padraig	Downpatrick
Dun na nGall Contae Dhun na nGall	Donegal County Donegal	Leifear	Lifford
Dun Laoghaire?Rath an Duin* Contae Dun Laoghaire?Rath an Duin *	Dun Laoghaire-Rathdown* County of Dun Laoghaire-Rathdown	Dun Laoghaire	Dun Laoghaire
Fear Manach Contae Fhear Manach	Fermanagh County Fermanagh	Inis Ceithleann	Enniskillen
Fine Gall* Contae Fine Gall	Fingal* County of Fingal	Sord Cholm Cille	Swords
Gaillimh Contae na Gaillimhe	Galway County Galway	Gaillimh	Galway
An Iarmhi Contae na hIarmhi	Westmeath County Westmeath	An Muileann gCearr	Mullingar
Laois Contae Laoise	Laoise County Laoise	Portlaoise	Portlaoise
Liatroim Contae Liatroma	Leitrim County Leitrim	Cora Droma Ruisc	Carrick-on-Shannon
Loch Garman Contae Loch Garman	Wexford County Wexford	Loch Garman	Wexford
An Longfort Contae an Longfoirt	Longford County Longford	An Longfort	Longford
Luimneach Contae Luimnigh	Limerick County Limerick	Luimneach	Limerick
Lu Contae Lu	Louth County Louth	Dun Dealgan	Dundalk
Maigh Eo Contae Mhaigh Eo	Mayo County Mayo	Caislean an Bharraigh	Castlebar
An Mhi Contae na Mi	Meath County Meath	An Uaimh	Navan
Muineachan Contae Mhuineachain	Monaghan County Monaghan	Muineachan	Monaghan
Port Lairge Contae Phort Lairge	Waterford County Waterford	Port Lairge	Waterford
Ros Comain Contae Ros Comain	Roscommon County Roscommon	Ros Comain	Roscommon
Sligeach Contae Shligigh	Sligo County Sligo	Sligeach	Sligo
Tiobraid Arann Contae Thiobraid Arann	Tipperary County Tipperary	An tAonach ( gog ) Cluain Meala ( de )	Nenagh ( gog ) Clonmel ( de )
Tir Eoghain Contae Thir Eoghain	Tyrone County Tyrone	An Omaigh	Omagh
Uibh Fhaili Contae Uibh Fhaili	Offaly County Offaly	Tulach Mhor	Tullamore

Nodyn: * - Mae Swydd Ddulyn yn dair swydd weinyddol: (i) Contae Atha Cliath Theas / County of South Dublin ; (ii) Contae Fine Gall / County of Fingal ; (iii) Contae Dun Laoghaire?Rath an Duin / County of Dun Laoghaire-Rathdown .

Defnyddir y siroedd traddodiadol ar gyfer daearyddiaeth cyffredinol, rhifau ceir a chwaraeon traddodiadol.