Welsh Assembly Election, 1999
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First-Past-the-Post results
| Party | Votes | Seats | Loss/Gain | Share of Vote (%) |
| Labour | 384,671 | 27 | N/A | 37.6 |
| Plaid Cymru | 290,572 | 9 | N/A | 28.4 |
| Conservative | 162,133 | 1 | N/A | 15.8 |
| Liberal Democrats | 137,857 | 3 | N/A | 13.5 |
| Others | 47,992 | 0 | N/A | 4.7 |
Additional Members System Results
| Party | Votes | Seats | Loss/Gain | Share of Vote (%) |
| Labour | 361,657 | 1 | N/A | 35.5 |
| Plaid Cymru | 312,048 | 8 | N/A | 30.6 |
| Conservative | 168,206 | 8 | N/A | 16.5 |
| Liberal Democrats | 128,008 | 3 | N/A | 12.5 |
| Others | 50,068 | 0 | N/A | 4.9 |