Carmarthen East & Dinefwr| Adam Price | Plaid Cymru | 16,130 | 42.4% |
| Alan Williams | Labour | 13,540 | 35.6% |
| David Thomas | Conservative | 4,912 | 12.9% |
| Doiran Evans | LibDem | 2,815 | 7.4% |
| Mike Squires | UKIP | 656 | 1.7% |
Electorate 54,035; Turnout 70.4%; Majority 2,590 (6.8%)
Swing: 7.6% to PC from Lab; Declared: 4.09am
| A Williams | Labour | 17,907 | 42.91% |
| R Thomas | Plaid Cymru | 14,457 | 34.64% |
| E Hayward | Conservative | 5,022 | 12.03% |
| J Hughes | LibDem | 3,150 | 7.55% |
| I Humphries-Evans | Referendum | 1,196 | 2.87% |
Electorate: 53,121; Turnout: 78.56%; Lab majority 3,450 (8.27%)
Swing from Lab to PC of 2.10%