Notional results for a UK general election on 5 May 2005 Elections won by Liberal Democrat
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 |
| Ceredigion | 52,514 | 68.0% | 13,045 | 36.5% | 218 |
| Camborne and Redruth | 61,035 | 63.2% | 13,830 | 35.9% | 2,733 |
| Leeds North West | 66,231 | 62.8% | 15,328 | 36.9% | 2,064 |
| Portsmouth South | 64,306 | 57.4% | 15,370 | 41.6% | 2,955 |
| Montgomeryshire | 46,655 | 66.3% | 15,548 | 50.3% | 7,048 |
| Manchester, Withington | 69,227 | 55.4% | 16,195 | 42.3% | 531 |
| Birmingham, Yardley | 71,986 | 54.5% | 16,485 | 42.0% | 2,864 |
| Carshalton and Wallington | 64,989 | 64.3% | 16,870 | 40.4% | 1,225 |
| York Outer | 71,464 | 64.4% | 16,904 | 36.7% | 203 |
| Bermondsey and Old Southwark | 73,944 | 48.8% | 17,177 | 47.6% | 5,769 |
| Brecon and Radnorshire | 55,171 | 69.5% | 17,182 | 44.8% | 3,905 |
| Truro and Falmouth | 65,288 | 65.1% | 17,406 | 41.0% | 3,931 |
| Bristol West | 70,819 | 63.6% | 17,599 | 39.1% | 1,147 |
| North Cornwall | 65,257 | 64.5% | 17,812 | 42.3% | 2,892 |
| Cardiff Central | 61,079 | 59.2% | 17,991 | 49.8% | 5,593 |
| Eastleigh | 74,167 | 64.4% | 18,313 | 38.3% | 534 |
| Bath | 60,023 | 69.1% | 18,845 | 45.4% | 5,624 |
| Cheltenham | 76,704 | 62.5% | 18,877 | 39.4% | 316 |
| Torbay | 75,272 | 60.2% | 18,943 | 41.8% | 2,727 |
| Southport | 67,530 | 61.0% | 19,093 | 46.3% | 3,838 |
| Berwick-upon-Tweed | 57,519 | 63.3% | 19,147 | 52.6% | 8,585 |
| Romsey and Southampton North | 66,353 | 66.4% | 19,217 | 43.6% | 204 |
| Hazel Grove | 62,991 | 61.3% | 19,423 | 50.3% | 7,694 |
| Colchester | 72,405 | 56.5% | 19,517 | 47.7% | 6,388 |
| Chippenham | 69,443 | 66.9% | 19,704 | 42.4% | 2,183 |
| Hereford and South Herefordshire | 69,022 | 66.1% | 19,793 | 43.4% | 1,089 |
| Chesterfield | 71,716 | 59.9% | 20,190 | 47.0% | 2,733 |
| Sutton and Cheam | 64,281 | 67.2% | 20,255 | 46.9% | 2,689 |
| Hornsey and Wood Green | 76,630 | 61.8% | 20,512 | 43.3% | 2,395 |
| Newton Abbot | 66,766 | 68.9% | 20,967 | 45.6% | 4,830 |
| Sheffield, Hallam | 67,522 | 67.9% | 21,253 | 46.4% | 7,416 |
| Cambridge | 80,588 | 59.0% | 21,278 | 44.8% | 5,834 |
| St Austell and Newquay | 70,872 | 64.9% | 21,747 | 47.3% | 5,723 |
| South East Cornwall | 68,856 | 67.7% | 21,795 | 46.8% | 5,485 |
| Westmorland and Lonsdale | 67,131 | 70.8% | 21,829 | 46.0% | 806 |
| Mid Dorset and North Poole | 62,730 | 72.1% | 22,596 | 50.0% | 5,931 |
| St Ives | 64,459 | 67.8% | 22,651 | 51.8% | 10,711 |
| North Devon | 72,171 | 68.3% | 22,869 | 46.4% | 5,276 |
| Somerton and Frome | 77,035 | 69.3% | 23,341 | 43.8% | 595 |
| Oxford West and Abingdon | 75,715 | 67.1% | 23,418 | 46.1% | 6,816 |
| Cheadle | 72,103 | 68.7% | 23,671 | 47.8% | 3,672 |
| Richmond Park | 69,566 | 73.2% | 23,771 | 46.7% | 3,613 |
| Lewes | 66,979 | 69.8% | 24,071 | 51.5% | 7,889 |
| Taunton Deane | 81,767 | 69.3% | 25,159 | 44.4% | 1,868 |
| Winchester | 71,253 | 71.9% | 25,621 | 50.0% | 6,524 |
| Thornbury and Yate | 64,045 | 73.6% | 25,622 | 54.3% | 11,060 |
| Kingston and Surbiton | 74,102 | 67.7% | 25,637 | 51.1% | 9,084 |
| Harrogate and Knaresborough | 73,815 | 66.7% | 25,639 | 52.1% | 7,980 |
| Yeovil | 79,306 | 63.9% | 26,076 | 51.5% | 8,779 |
| North Norfolk | 68,221 | 72.7% | 26,410 | 53.2% | 8,575 |
| Twickenham | 71,444 | 72.3% | 26,696 | 51.6% | 9,965 |
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
Professors Colin Rallings and Michael Thrasher, at The Elections Centre of the University of Exeter, 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.