myireland.ie
Buaicphointí na gcontaetha

The highest point in every county

From Carrauntoohil in Kerry at 1039 metres to Mullaghmeen in Westmeath at 258, the top of each of the 32 counties, with its Irish name.

CountySummitIn IrishHeight (m)Range
Kerry Carrauntoohil ↗ Corrán Tuathail 1,039 MacGillycuddy's Reeks
Wicklow Lugnaquilla ↗ Log na Coille 925 Wicklow Mountains
Limerick Galtymore ↗ (shared) Cnoc Mór na nGaibhlte 918 Galty Mountains
Tipperary Galtymore ↗ (shared) Cnoc Mór na nGaibhlte 918 Galty Mountains
Down Slieve Donard ↗ Sliabh Dónairt 850 Mourne Mountains
Mayo Mweelrea ↗ Cnoc Maol Réidh 814 Mweelrea Mountains
Carlow Mount Leinster ↗ (shared) Stua Laighean 794 Blackstairs Mountains
Wexford Mount Leinster ↗ (shared) Stua Laighean 794 Blackstairs Mountains
Waterford Knockmealdown ↗ Cnoc Mhaoldomhnaigh 792 Knockmealdown Mountains
Dublin Kippure ↗ Cipiúr 757 Wicklow Mountains
Donegal Errigal ↗ An Earagail 751 Derryveagh Mountains
Galway Benbaun ↗ An Bhinn Bhán 729 Twelve Bens
Cork Knockboy ↗ An Cnoc Buí 706 Shehy Mountains
Derry / Londonderry Sawel ↗ (shared) Samhail 678 Sperrin Mountains
Tyrone Sawel ↗ (shared) Samhail 678 Sperrin Mountains
Cavan Cuilcagh ↗ (shared) Binn Chuilceach 665 Breifne Mountains
Fermanagh Cuilcagh ↗ (shared) Binn Chuilceach 665 Breifne Mountains
Sligo Truskmore ↗ Trosc Mór 647 Dartry Mountains
Leitrim Truskmore SE Cairn ↗ — 631 Dartry Mountains
Louth Slieve Foye ↗ Sliabh Feá 589 Cooley Mountains
Armagh Slieve Gullion ↗ Sliabh gCuillinn 573 Ring of Gullion
Antrim Trostan ↗ Trostán 550 Antrim Hills
Clare Moylussa ↗ — 532 Slieve Bernagh
Laois Arderin ↗ (shared) Ard Éireann 527 Slieve Bloom
Offaly Arderin ↗ (shared) Ard Éireann 527 Slieve Bloom
Kilkenny Brandon Hill ↗ Cnoc Bhréanail 515 South Midlands (Brandon Hill)
Roscommon Seltannasaggart ↗ — 428 Arigna Mountains
Kildare Cupidstown Hill ↗ Cnoc Bhaile Cupid 379 Wicklow Mountains
Monaghan Slieve Beagh ↗ Sliabh Beatha 373 Fermanagh/ S. Tyrone
Longford Carn Clonhugh ↗ Carn Clainne Aodha 278 North Midlands
Meath Slieve na Calliagh ↗ Sliabh na Caillí 276 North Midlands
Westmeath Mullaghmeen ↗ An Mullach Mín 258 North Midlands

"Shared" means the summit lies on a county boundary and is the top of both counties: Limerick, Tipperary, Carlow, Wexford, Derry / Londonderry, Tyrone, Cavan, Fermanagh, Laois, Offaly.

Quick answers
What is the highest mountain in Ireland?

Carrauntoohil (Corrán Tuathail) in the MacGillycuddy's Reeks, County Kerry, at 1039 metres.

What is the highest mountain in each province?

Munster: Carrauntoohil, 1039 m; Leinster: Lugnaquilla, 925 m; Ulster: Slieve Donard, 850 m; Connacht: Mweelrea, 814 m.

Which county has the lowest highest point?

Westmeath, whose top is Mullaghmeen at 258 metres.

Sources

Heights and ranges from Wikipedia's List of Irish counties by highest point ↗, which uses the MountainViews ↗ database of Ordnance Survey data. Irish names from Wikidata, linked to Logainm.ie where it holds the record.