Belfast Derry 1 Dublin 1,110,627 1,801,040 2 Belfast 579,726 [ 122 ] 3 Cork 198,582 4 Limerick 91,454 5 Derry 90,663 [ 122 ] 6 Galway 76,778 7 Craigavon 57,651 [ 122 ] 8 Waterford 51,519 9 Drogheda 38,578 10 Dundalk 37,816 [ edit ] Migration The population of Ireland since