| | City | Population |
| 1. | Dublin | 1,024,027 |
| 2. | Cork | 188,907 |
| 3. | Dun Laoghaire | 185,400 |
| 4. | Limerick | 90,054 |
| 5. | Galway | 70,686 |
| 6. | Tallaght | 64,282 |
| 7. | Port Lairge | 47,904 |
| 8. | Drogheda | 33,441 |
| 9. | Dun Dealgan | 33,428 |
| 10. | Bray | 32,317 |
| 11. | Sord | 29,816 |
| 12. | An Uaimh | 24,545 |
| 13. | Inis | 24,427 |
| 14. | Tra Li | 22,941 |
| 15. | Cill Chainnigh | 21,589 |
| 16. | An Nas | 20,554 |
| 17. | Sligeach | 20,228 |
| 18. | Ceatharlach | 20,055 |
| 19. | Droichead Nua | 18,860 |
| 20. | Cill Droichid | 18,167 |
| 21. | Loch Garman | 17,708 |
| 22. | Clonmel | 17,394 |
| 23. | An Muileann gCearr | 17,262 |
| 24. | Letterkenny | 16,901 |
| 25. | Baile Atha Luain | 15,951 |
| 26. | Leixlip | 15,729 |
| 27. | Malahide | 14,057 |
| 28. | Port Laoise | 13,622 |
| 29. | Carraig Ui Leighin | 12,902 |
| 30. | Castlebar | 12,874 |
| 31. | Greystones | 12,260 |
| 32. | Tullamore | 11,575 |
| 33. | Maynooth | 11,318 |
| 34. | Balbriggan | 11,293 |
| 35. | Arklow | 10,622 |
| 36. | Cobh | 10,501 |
| 37. | Cill Mhantain | 10,461 |
| 38. | Beal An Atha | 10,087 |
| 39. | Na Sceiri | 10,014 |
| 40. | Inis Corthaidh | 9,709 |
| 41. | Mallow | 9,495 |
| 42. | Tra Mhor | 9,164 |
| 43. | Mainister na Corann | 8,891 |
| 44. | Sionainn | 8,781 |
| 45. | Portmarnock | 8,037 |
| 46. | An Longfort | 7,787 |
| 47. | Durlas | 7,588 |
| 48. | Dungarvan | 7,551 |
| 49. | Cill Airne | 7,300 |
| 50. | An Ros | 7,294 |
| 51. | Cill Dheaglain | 7,001 |
| 52. | Eochaill | 6,868 |
| 53. | Newtown Trim | 6,781 |
| 54. | Dunboyne | 6,718 |
| 55. | Ros Mhic Thriuin | 6,695 |
| 56. | Nenagh Bridge | 6,672 |
| 57. | An Cabhan | 6,388 |
| 58. | Beal Atha na Sluaighe | 6,388 |
| 59. | Baile Atha I | 6,382 |
| 60. | Cherryville | 6,380 |
| 61. | An Inse | 6,342 |
| 62. | Cathair na Mart | 6,200 |
| 63. | Tuaim | 6,130 |
| 64. | Gorey | 6,040 |
| 65. | Muineachan | 5,937 |
| 66. | Carrick-on-Suir | 5,710 |
| 67. | Bun Cranncha | 5,546 |
| 68. | An tAonach | 5,500 |
| 69. | Droichead na Bandon | 5,492 |
| 70. | Claonadh | 5,155 |
| 71. | Tiobraid Arann | 4,976 |
| 72. | Mainistir Fhear Mai | 4,933 |
| 73. | An Pasaiste | 4,907 |
| 74. | Edenderry | 4,890 |
| 75. | Ros Comain | 4,860 |
| 76. | Ceanannas | 4,820 |
| 77. | Roscrea | 4,721 |
| 78. | Birr | 4,549 |
| 79. | Baile Locha Riach | 4,296 |
| 80. | Portarlington | 4,293 |
| 81. | Gaoth Dobhair | 4,200 |
| 82. | An Caislean Nua | 4,184 |
| 83. | Lios Tuathail | 4,143 |
| 84. | Rath To | 4,084 |
| 85. | Clonakilty | 4,065 |
| 86. | Baile Atha Fhirdhia | 4,008 |
| 87. | Carraig Mhachaire Rois | 3,995 |
| 88. | Donabate | 3,936 |
| 89. | Bealach Feich | 3,848 |
| 90. | Cionn tSaile | 3,843 |
| 91. | Dunshaughlin | 3,567 |
| 92. | Mountmellick | 3,547 |
| 93. | Dunlewy | 3,400 |
| 94. | Baile Mhisteala | 3,357 |
| 95. | Cill Choca | 3,293 |
| 96. | Beanntrai | 3,234 |
| 97. | Macroom | 3,169 |
| 98. | Na Sollain | 3,164 |
| 99. | Tower | 3,099 |
| 100. | Caher | 3,057 |
The Source for World Rankings