Notional results for a UK general election on 5 May 2005 Elections won by Sinn Féin
A notional general election to the 54th Parliament of the United Kingdom with an electorate of 40,611,844, having 24,814,623 valid votes.
| Constituency | Electorate | Turnout | Votes | Vote share | Majority |
| Belfast West | 53,536 | 64.5% | 24,348 | 70.5% | 19,315 |
| Fermanagh and South Tyrone | 66,415 | 73.5% | 18,638 | 38.2% | 4,582 |
| Mid Ulster | 62,088 | 73.2% | 21,641 | 47.6% | 10,976 |
| Newry and Armagh | 71,771 | 70.6% | 20,965 | 41.4% | 8,195 |
| West Tyrone | 59,842 | 72.7% | 16,910 | 38.9% | 5,005 |
Turnout as calculated by the House of Commons Library, is the total number of votes cast and not spoiled, divided by the size of the electorate.
Estimates of the 2005 general election result in new constituencies
Colin Rallings and Michael Thrasher, then at the University of Plymouth, produced estimates of the 2005 general election result as if the new constituencies recommended by the separate Parliamentary Boundary Commissions for England, Wales and Northern Ireland had then been in existence.
The Elections Centre, established by Professors Colin Rallings and Michael Thrasher, moved to the University of Exeter in 2003.