Ireland - Counties listed by Density of Population

County Area (kmē) Population Number per kmē Dublin 921 448,206 487 Antrim 2844 545,270 192 Armagh 1254 125,392 100 Down 2448 205,889 84 Louth 820 65,820 80 Derry 2074 144,404 70 Monaghan 1,294 74,611 58 Limerick 2,686 146,098 54 Cork 7,457 404,611 54 Cavan 1,931 97,541 51 Tyrone 3155 150,567 48 Waterford 1,837 87,187 47 Sligo 1,836 84,083 46 Wexford 2,352 104,104 44 Leitrim 1,588 69,343 44 Longford 1,091 46,672 43 Carlow 896 37,748 42 Roscommon 2,547 101,791 40 Fermanagh 1691 65,430 39 Kilkenny 2,061 79,159 38 Kildare 1,693 63,566 38 Tipperary 4,303 160,232 37 Clare 3,147 112,334 36 Donegal 4,841 172,722 36 Mayo 5,585 199,166 36 Laois 1,719 57417 35 Kerry 4,746 165,726 35 Westmeath 1,838 61,629 34 Galway 6,148 192,549 31 Offaly 2,000 60,187 30 Wicklow 2,024 60,824 30 Meath 2,342 67,497 29

* Derry or Londonderry. Both names are in use.

Sources:

Irish Historical Statistics
Population 1821-1971
edited by W. E. Vaughan and A. J. Fitzpatrick
Royal Irish Academy - 1978