Wales, 1964 vs 1966: seat-by-seat change
Every constituency in Wales compared between the 1964 and 1966 general elections: which seats changed hands and how far each swung.
| Constituency | 1964 | 1966 | Majority | Con–Lab swing |
|---|---|---|---|---|
| Aberavon | Lab | Lab | 54.5% | +1.5 |
| Aberdare | Lab | Lab | 61.6% | −0.2 |
| Abertillery | Lab | Lab | 76.2% | +2.2 |
| Anglesey | Lab | Lab | 19.6% | −1.8 |
| Barry | Con | Con | 2.6% | +2.8 |
| Bedwellty | Lab | Lab | 72.5% | +2.7 |
| Brecon and Radnor | Lab | Lab | 21.0% | +0.2 |
| Caernarvon | Lab | Lab | 34.0% | +1.9 |
| Caerphilly | Lab | Lab | 59.6% | +2.2 |
| Cardiff North | Con | Lab gain | 1.4% | +4.4 |
| Cardiff South East | Lab | Lab | 21.0% | +3.0 |
| Cardiff West | Lab | Lab | 22.0% | +1.8 |
| Cardigan | Lib | Lab gain | 1.7% | +3.2 |
| Carmarthen | Lab | Lab | 20.1% | −0.1 |
| Conway | Con | Lab gain | 1.5% | +5.5 |
| Denbigh | Con | Con | 10.6% | +3.7 |
| East Flintshire | Lab | Lab | 17.8% | +4.7 |
| Ebbw Vale | Lab | Lab | 70.3% | +1.5 |
| Gower | Lab | Lab | 54.3% | +2.9 |
| Llanelli | Lab | Lab | 56.3% | +1.6 |
| Merioneth | Lab | Lab | 8.7% | +4.5 |
| Merthyr Tydfil | Lab | Lab | 60.5% | +0.3 |
| Monmouth | Con | Lab gain | 5.5% | +6.1 |
| Montgomery | Lib | Lib | 14.1% | +0.3 |
| Neath | Lab | Lab | 63.6% | +5.3 |
| Newport | Lab | Lab | 19.6% | +2.3 |
| Ogmore | Lab | Lab | 56.7% | +2.8 |
| Pembroke | Lab | Lab | 12.0% | −2.5 |
| Pontypool | Lab | Lab | 56.6% | +1.9 |
| Pontypridd | Lab | Lab | 49.8% | +3.6 |
| Rhondda East | Lab | Lab | 69.0% | +4.2 |
| Rhondda West | Lab | Lab | 67.4% | −0.2 |
| Swansea East | Lab | Lab | 59.9% | +2.7 |
| Swansea West | Lab | Lab | 12.8% | +3.7 |
| West Flintshire | Con | Con | 7.2% | +2.8 |
| Wrexham | Lab | Lab | 34.0% | +4.4 |
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