Results for a UK general election on 12 December 2019 Great Britain - Elections won by Plaid Cymru
A general election to the 58th Parliament of the United Kingdom with an electorate of 47,562,702, having 32,014,110 valid votes and 117,919 invalid votes.
Read the House of Commons Library briefing.
| Constituency | Candidate | Electorate | Turnout | Votes | Vote share | Vote change | Majority |
| Arfon | WILLIAMS, Hywel | 42,215 | 68.9% | 13,134 | 45.2% | 4.3% | 2,781 |
| Carmarthen East and Dinefwr | EDWARDS, Jonathan | 57,419 | 71.4% | 15,939 | 38.9% | -0.4% | 1,809 |
| Ceredigion | LAKE, Ben | 56,386 | 71.1% | 15,208 | 37.9% | 8.7% | 6,329 |
| Dwyfor Meirionnydd | SAVILLE ROBERTS, Liz | 44,362 | 67.5% | 14,447 | 48.3% | 3.2% | 4,740 |
Turnout as calculated by the House of Commons Library, is the total number of votes cast and not spoiled, divided by the size of the electorate.