County | 1831 Census | 1841 Census | Forecasted 1851 Census | Actual 1851 Census | % Decrease 1841-1851 | Population Decrease 1841-1851 | Estimated Population Decrease due to Famine & Emigration |
Antrim | 323,306 | 360,870 | 398,434 | 359,934 | 0% | 936 | 38,500 |
Armagh | 220,651 | 232,393 | 244,135 | 196,084 | 16% | 36,309 | 48,051 |
Carlow | 81,576 | 86,228 | 90,880 | 68,078 | 21% | 18,150 | 22,802 |
Cavan | 228,050 | 243,158 | 258,266 | 174,064 | 28% | 69,094 | 84,202 |
Clare | 258,262 | 286,394 | 314,526 | 212,440 | 26% | 73,954 | 102,086 |
Cork | 812,967 | 854,118 | 895,269 | 649,308 | 24% | 204,810 | 245,961 |
Donegal | 298,104 | 296,448 | 294,792 | 255,158 | 14% | 41,290 | 39,634 |
Down | 352,571 | 361,446 | 370,321 | 320,817 | 11% | 40,629 | 49,504 |
Dublin | 386,694 | 372,773 | 358,852 | 405,147 | -9% | (32,374) | (46,295) |
Fermanagh | 149,555 | 156,481 | 163,407 | 116,047 | 26% | 40,434 | 47,360 |
Galway | 427,407 | 440,198 | 452,989 | 321,684 | 27% | 118,514 | 131,305 |
Kerry | 264,559 | 293,880 | 323,201 | 238,254 | 19% | 55,626 | 84,947 |
Kildare | 108,401 | 114,488 | 120,575 | 95,723 | 16% | 18,765 | 24,852 |
Kilkenny | 193,024 | 202,420 | 211,816 | 158,748 | 22% | 43,672 | 53,068 |
King's | 144,029 | 146,857 | 149,685 | 112,076 | 24% | 34,781 | 37,609 |
Leitrim | 141,303 | 155,297 | 169,291 | 111,897 | 28% | 43,400 | 57,394 |
Limerick | 300,080 | 330,029 | 359,978 | 262,132 | 21% | 67,897 | 97,846 |
Londonderry | 222,416 | 222,174 | 221,932 | 192,022 | 14% | 30,152 | 29,910 |
Longford | 112,391 | 115,491 | 118,591 | 82,348 | 29% | 33,143 | 36,243 |
Louth | 125,533 | 128,240 | 130,947 | 107,662 | 16% | 20,578 | 23,285 |
Mayo | 367,956 | 388,887 | 409,818 | 274,499 | 29% | 114,388 | 135,319 |
Meath | 177,023 | 183,828 | 190,633 | 140,748 | 23% | 43,080 | 49,885 |
Monaghan | 195,532 | 200,442 | 205,352 | 141,823 | 29% | 58,619 | 63,529 |
Queen's | 145,843 | 153,930 | 162,017 | 111,664 | 27% | 42,266 | 50,353 |
Roscommon | 239,903 | 253,589 | 267,275 | 173,436 | 32% | 80,153 | 93,839 |
Sligo | 171,508 | 181,002 | 190,496 | 128,515 | 29% | 52,487 | 61,981 |
Tipperary | 402,598 | 435,553 | 468,508 | 331,567 | 24% | 103,986 | 136,941 |
Tyrone | 302,943 | 312,956 | 322,969 | 255,661 | 18% | 57,295 | 67,308 |
Waterford | 176,898 | 196,187 | 215,476 | 164,035 | 16% | 32,152 | 51,441 |
Westmeath | 148,161 | 141,300 | 134,439 | 111,407 | 21% | 29,893 | 23,032 |
Wexford | 182,991 | 202,033 | 221,075 | 180,158 | 11% | 21,875 | 40,917 |
Wicklow | 122,301 | 126,143 | 129,985 | 98,979 | 22% | 27,164 | 31,006 |
Totals | 7,784,536 | 8,175,233 | 8,565,930 | 6,552,115 | 20% | 1,623,118 | 2,013,815 |
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