Notional results for a UK general election on 5 May 2005 South West, England - by majority
| Constituency | Winning party | Valid votes | Majority (votes) | Majority (%) |
| Christchurch | Con | 46,807 | 14,640 | 31.3% |
| Devizes | Con | 42,813 | 12,259 | 28.6% |
| Bristol South | Lab | 43,967 | 10,928 | 24.9% |
| St Ives | LD | 43,691 | 10,711 | 24.5% |
| Thornbury and Yate | LD | 47,160 | 11,060 | 23.5% |
| The Cotswolds | Con | 50,451 | 10,742 | 21.3% |
| South West Devon | Con | 46,931 | 9,442 | 20.1% |
| Tewkesbury | Con | 46,152 | 9,130 | 19.8% |
| Bridgwater and West Somerset | Con | 50,988 | 10,081 | 19.8% |
| Salisbury | Con | 45,444 | 8,860 | 19.5% |
| Plymouth, Moor View | Lab | 39,960 | 7,740 | 19.4% |
| East Devon | Con | 47,672 | 9,168 | 19.2% |
| South West Wiltshire | Con | 45,454 | 8,568 | 18.8% |
| Tiverton and Honiton | Con | 51,332 | 9,007 | 17.5% |
| Bristol East | Lab | 42,266 | 7,335 | 17.4% |
| Yeovil | LD | 50,665 | 8,779 | 17.3% |
| Exeter | Lab | 49,574 | 8,559 | 17.3% |
| North Wiltshire | Con | 44,897 | 6,888 | 15.3% |
| Poole | Con | 42,144 | 6,035 | 14.3% |
| Bournemouth East | Con | 41,835 | 5,874 | 14.0% |
| Kingswood | Lab | 44,647 | 6,145 | 13.8% |
| Bath | LD | 41,466 | 5,624 | 13.6% |
| Mid Dorset and North Poole | LD | 45,220 | 5,931 | 13.1% |
| Gloucester | Lab | 46,821 | 6,063 | 12.9% |
| St Austell and Newquay | LD | 46,001 | 5,723 | 12.4% |
| South East Cornwall | LD | 46,586 | 5,485 | 11.8% |
| North Somerset | Con | 51,736 | 6,007 | 11.6% |
| Plymouth, Sutton and Devonport | Lab | 40,245 | 4,472 | 11.1% |
| North Devon | LD | 49,268 | 5,276 | 10.7% |
| Newton Abbot | LD | 46,012 | 4,830 | 10.5% |
| Truro and Falmouth | LD | 42,480 | 3,931 | 9.3% |
| North Dorset | Con | 48,956 | 4,200 | 8.6% |
| Bournemouth West | Con | 36,613 | 2,766 | 7.6% |
| Camborne and Redruth | LD | 38,577 | 2,733 | 7.1% |
| North Cornwall | LD | 42,098 | 2,892 | 6.9% |
| North Swindon | Lab | 42,811 | 2,675 | 6.2% |
| Torbay | LD | 45,348 | 2,727 | 6.0% |
| Totnes | Con | 46,735 | 2,693 | 5.8% |
| Wells | Con | 52,965 | 3,040 | 5.7% |
| Bristol North West | Lab | 48,851 | 2,781 | 5.7% |
| Torridge and West Devon | Con | 50,906 | 2,732 | 5.4% |
| Central Devon | Con | 46,880 | 2,338 | 5.0% |
| Chippenham | LD | 46,445 | 2,183 | 4.7% |
| West Dorset | Con | 53,225 | 2,461 | 4.6% |
| Forest of Dean | Con | 47,640 | 2,049 | 4.3% |
| Weston-Super-Mare | Con | 48,977 | 2,088 | 4.3% |
| South Dorset | Lab | 48,584 | 1,812 | 3.7% |
| South Swindon | Lab | 42,626 | 1,493 | 3.5% |
| Taunton Deane | LD | 56,649 | 1,868 | 3.3% |
| Bristol West | LD | 45,056 | 1,147 | 2.5% |
| Stroud | Lab | 53,775 | 996 | 1.9% |
| Filton and Bradley Stoke | Con | 41,243 | 653 | 1.6% |
| Somerton and Frome | LD | 53,350 | 595 | 1.1% |
| Cheltenham | LD | 47,904 | 316 | 0.7% |
| North East Somerset | Con | 46,416 | 212 | 0.5% |
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.