County Area (kmē) Population Number per kmē Cork 7,457 448,181 60 Galway 6,148 208,826 34 Mayo 5,585 117,428 21 Donegal 4,841 137,383 28 Kerry 4,746 132,424 28 Tipperary 4,303 140,281 33 Tyrone 3155 161,800 51 Clare 3,147 103,333 33 Antrim 2844 566,400 199 Limerick 2,686 175,529 65 Roscommon 2,547 53,803 21 Down 2448 416,600 170 Wexford 2,352 116,543 50 Meath 2,342 133,936 57 Derry* 2074 214,800 104 Kilkenny 2,061 80,421 39 Wicklow 2,024 114,719 57 Offaly 2,000 63,702 32 Cavan 1,931 56,416 29 Westmeath 1,838 72,027 39 Waterford 1,837 101,518 55 Sligo 1,836 58,178 32 Laois 1,719 58,732 34 Kildare 1,693 163,995 97 Fermanagh 1691 54,200 32 Leitrim 1,588 25,815 16 Monaghan 1,294 52,772 41 Armagh 1254 127,700 102 Longford 1,091 31,127 29 Dublin 921 1,122,600 1,219 Carlow 896 45,845 51 Louth 820 101,802 124

* Derry or Londonderry. Both names are in use.

Sources:

Republic of Ireland - 2002 Census results
Northern Ireland - Population estimates 1992 per Microsoft Encarta 1996