Highest points by county in Ireland.
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| County | Mountain Name | Height (metres) | Grid Reference | OS 1:50k map |
| Antrim | Trostan | 550 | D 179 236 | 9 |
| Armagh | Slieve Gullion | 573 | J 025 203 | 29 |
| Carlow | Mount Leinster | 795 | S 827 525 | 68 |
| Cavan | Cuilcagh | 665 | H 123 281 | 26 |
| Clare | Moylussa | 532 | R 648 759 | 58 |
| Cork | Knockboy | 706 | W 005 620 | 85 |
| Donegal | Errigal | 751 | B 928 207 | 1 |
| Down | Slieve Donard | 850 | J 357 277 | 29 |
| Dublin | Kippure | 757 | O 116 154 | 56 |
| Fermanagh | Cuilcagh | 665 | H 123 281 | 26 |
| Galway | Binn Bhán | 729 | L 786 539 | 37 |
| Kerry | Carrauntoohil | 1039 | V 803 844 | 78 |
| Kildare | Cupidstown Hill | 379 | O 006 206 | 50 |
| Kilkenny | Brandon Hill | 515 | S 697 402 | 68 |
| Laois | Arderin | 527 | S 232 989 | 54 |
| Leitrim | Truskmore | 647 | G 759 473 | 16 |
| Limerick | Galtymore | 919 | R 879 238 | 74 |
| Londonderry (Derry) | Sawel | 678 | H 618 973 | 13 |
| Longford | Corn Hill | 278 | N 187 841 | 34 |
| Louth | Slieve Foye | 589 | J 169 120 | 29&36A |
| Mayo | Mweelrea | 814 | L 789 668 | 37 |
| Meath | Carnbane East | 279 | N 585 775 | 42 |
| Monaghan | Slieve Beagh East | 366 | H 532 435 | 18 |
| Offaly | Arderin | 527 | S 232 989 | 54 |
| Roscommon | Corrie Mountain | 422 | G 901 202 | 26 |
| Sligo | Truskmore | 647 | G 759 473 | 16 |
| Tipperary | Galtymore | 919 | R 879 238 | 74 |
| Tyrone | Sawel | 678 | H 618 973 | 13 |
| Waterford | Knockmealdown | 794 | S 058 084 | 74 |
| Westmeath | Mullaghmeen | 258 | N 469 793 | 41 |
| Wexford | Mount Leinster | 795 | S 827 525 | 68 |
| Wicklow | Lugnaquilla | 925 | T 032 917 | 56 |