Wales, 2015 vs 2017: seat-by-seat change
Every constituency in Wales compared between the 2015 and 2017 general elections: which seats changed hands and how far each swung.
| Constituency | 2015 | 2017 | Majority | Con–Lab swing |
|---|---|---|---|---|
| Aberavon | Lab | Lab | 50.4% | +6.7 |
| Aberconwy | Con | Con | 2.0% | +5.7 |
| Alyn and Deeside | Lab | Lab | 11.7% | +1.8 |
| Arfon | PC | PC | 0.3% | +3.5 |
| Blaenau Gwent | Lab | Lab | 36.8% | −2.0 |
| Brecon and Radnorshire | Con | Con | 19.5% | −2.3 |
| Bridgend | Lab | Lab | 10.9% | +3.0 |
| Caerphilly | Lab | Lab | 29.3% | +0.7 |
| Cardiff Central | Lab | Lab | 42.6% | +8.6 |
| Cardiff North | Con | Lab gain | 8.0% | +6.1 |
| Cardiff South and Penarth | Lab | Lab | 29.3% | +6.7 |
| Cardiff West | Lab | Lab | 26.9% | +5.7 |
| Carmarthen East and Dinefwr | PC | PC | 9.5% | +0.2 |
| Carmarthen West and South Pembrokeshire | Con | Con | 7.4% | +3.8 |
| Ceredigion | LD | PC gain | 0.3% | +1.6 |
| Clwyd South | Lab | Lab | 11.6% | +2.4 |
| Clwyd West | Con | Con | 8.5% | +4.6 |
| Cynon Valley | Lab | Lab | 41.6% | +3.0 |
| Delyn | Lab | Lab | 10.8% | +1.5 |
| Dwyfor Meirionnydd | PC | PC | 16.0% | +0.4 |
| Gower | Con | Lab gain | 7.2% | +3.6 |
| Islwyn | Lab | Lab | 31.6% | −1.1 |
| Llanelli | Lab | Lab | 29.8% | +1.4 |
| Merthyr Tydfil and Rhymney | Lab | Lab | 48.7% | +2.5 |
| Monmouth | Con | Con | 16.5% | +3.3 |
| Montgomeryshire | Con | Con | 26.6% | +1.7 |
| Neath | Lab | Lab | 33.0% | +2.3 |
| Newport East | Lab | Lab | 21.7% | +4.2 |
| Newport West | Lab | Lab | 13.0% | +2.2 |
| Ogmore | Lab | Lab | 37.3% | +0.1 |
| Pontypridd | Lab | Lab | 28.7% | +2.5 |
| Preseli Pembrokeshire | Con | Con | 0.7% | +5.8 |
| Rhondda | Lab | Lab | 41.7% | +5.0 |
| Swansea East | Lab | Lab | 37.5% | −0.1 |
| Swansea West | Lab | Lab | 28.4% | +4.2 |
| Torfaen | Lab | Lab | 26.7% | +2.6 |
| Vale of Clwyd | Con | Lab gain | 6.2% | +3.4 |
| Vale of Glamorgan | Con | Con | 4.1% | +4.7 |
| Wrexham | Lab | Lab | 5.2% | −0.2 |
| Ynys Môn | Lab | Lab | 14.1% | +2.1 |
Official results House of Commons Library and UK Parliament election results data. Contains Parliamentary information licensed under the Open Parliament Licence v3.0. How we use this data