Notional results for a UK general election on 5 May 2005 North West, England - by majority
| Constituency | Winning party | Valid votes | Majority (votes) | Majority (%) |
| Knowsley | Lab | 41,936 | 24,333 | 58.0% |
| Liverpool, Walton | Lab | 32,153 | 17,611 | 54.8% |
| Bootle | Lab | 36,937 | 20,125 | 54.5% |
| Makerfield | Lab | 36,918 | 17,903 | 48.5% |
| Birkenhead | Lab | 31,676 | 14,638 | 46.2% |
| Liverpool, West Derby | Lab | 30,632 | 13,874 | 45.3% |
| Blackley and Broughton | Lab | 30,124 | 13,060 | 43.4% |
| Halton | Lab | 37,129 | 16,060 | 43.3% |
| Wigan | Lab | 39,596 | 15,501 | 39.1% |
| Leigh | Lab | 38,987 | 15,098 | 38.7% |
| Denton and Reddish | Lab | 33,994 | 13,128 | 38.6% |
| Manchester Central | Lab | 30,337 | 11,636 | 38.4% |
| Ashton-under-Lyne | Lab | 34,432 | 13,199 | 38.3% |
| St Helens North | Lab | 41,836 | 15,265 | 36.5% |
| Liverpool, Riverside | Lab | 32,649 | 11,731 | 35.9% |
| Bolton South East | Lab | 34,765 | 11,483 | 33.0% |
| Salford and Eccles | Lab | 32,805 | 10,707 | 32.6% |
| Wythenshawe and Sale East | Lab | 36,184 | 10,827 | 29.9% |
| Stockport | Lab | 34,630 | 9,982 | 28.8% |
| Fylde | Con | 38,773 | 11,117 | 28.7% |
| Warrington North | Lab | 39,899 | 11,382 | 28.5% |
| Garston and Halewood | Lab | 38,730 | 10,814 | 27.9% |
| Tatton | Con | 41,604 | 11,537 | 27.7% |
| Preston | Lab | 30,137 | 8,338 | 27.7% |
| Wyre and Preston North | Con | 43,926 | 12,082 | 27.5% |
| Oldham West and Royton | Lab | 38,534 | 10,454 | 27.1% |
| St Helens South and Whiston | Lab | 41,054 | 10,987 | 26.8% |
| Heywood and Middleton | Lab | 41,519 | 11,034 | 26.6% |
| Worsley and Eccles South | Lab | 39,037 | 10,001 | 25.6% |
| Penrith and The Border | Con | 42,206 | 10,795 | 25.6% |
| Wallasey | Lab | 38,072 | 9,130 | 24.0% |
| Stalybridge and Hyde | Lab | 35,760 | 8,455 | 23.6% |
| Workington | Lab | 35,814 | 8,226 | 23.0% |
| Bury South | Lab | 42,815 | 9,779 | 22.8% |
| Stretford and Urmston | Lab | 39,054 | 8,310 | 21.3% |
| Macclesfield | Con | 45,799 | 9,464 | 20.7% |
| Hazel Grove | LD | 38,629 | 7,694 | 19.9% |
| Manchester, Gorton | Lab | 32,412 | 6,355 | 19.6% |
| Blackburn | Lab | 41,388 | 8,048 | 19.4% |
| Blackpool South | Lab | 33,451 | 5,911 | 17.7% |
| Congleton | Con | 46,682 | 8,246 | 17.7% |
| Altrincham and Sale West | Con | 43,357 | 7,618 | 17.6% |
| Chorley | Lab | 44,388 | 7,285 | 16.4% |
| Ellesmere Port and Neston | Lab | 41,986 | 6,713 | 16.0% |
| Crewe and Nantwich | Lab | 45,142 | 6,999 | 15.5% |
| Ribble Valley | Con | 46,066 | 6,953 | 15.1% |
| Eddisbury | Con | 43,203 | 6,408 | 14.8% |
| Burnley | Lab | 38,983 | 5,778 | 14.8% |
| West Lancashire | Lab | 43,155 | 6,084 | 14.1% |
| Weaver Vale | Lab | 37,622 | 5,277 | 14.0% |
| Hyndburn | Lab | 40,059 | 5,528 | 13.8% |
| Carlisle | Lab | 37,791 | 5,085 | 13.5% |
| Copeland | Lab | 38,958 | 5,157 | 13.2% |
| Barrow and Furness | Lab | 38,625 | 4,843 | 12.5% |
| Sefton Central | Lab | 41,179 | 4,950 | 12.0% |
| Bolton North East | Lab | 37,772 | 4,527 | 12.0% |
| Bolton West | Lab | 42,184 | 5,041 | 12.0% |
| Morecambe and Lunesdale | Lab | 41,310 | 4,849 | 11.7% |
| Oldham East and Saddleworth | Lab | 40,863 | 4,245 | 10.4% |
| Southport | LD | 41,201 | 3,838 | 9.3% |
| Wirral South | Lab | 38,047 | 3,538 | 9.3% |
| Warrington South | Lab | 47,316 | 4,337 | 9.2% |
| Liverpool, Wavertree | Lab | 32,681 | 2,911 | 8.9% |
| Lancaster and Fleetwood | Lab | 38,876 | 3,428 | 8.8% |
| Blackpool North and Cleveleys | Lab | 38,199 | 3,241 | 8.5% |
| Rossendale and Darwen | Lab | 44,244 | 3,696 | 8.4% |
| Cheadle | LD | 49,564 | 3,672 | 7.4% |
| South Ribble | Lab | 46,639 | 2,528 | 5.4% |
| Pendle | Lab | 41,132 | 2,180 | 5.3% |
| Bury North | Lab | 40,778 | 2,059 | 5.0% |
| City of Chester | Lab | 44,284 | 973 | 2.2% |
| Westmorland and Lonsdale | LD | 47,505 | 806 | 1.7% |
| Wirral West | Con | 37,599 | 569 | 1.5% |
| Manchester, Withington | LD | 38,326 | 531 | 1.4% |
| Rochdale | Lab | 42,941 | 149 | 0.3% |
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.