CONSTITUENCY RESULT : Arfon
| Candidate name | Party | Gender | Number of votes | Share (%) | Change vs. 2017 for party (percentage points) | ||
| Hywel Williams | Plaid Cymru | Male | 13,134 | 45.2% | +4.3 | ||
| Steffie Williams Roberts | Labour | Female | 10,353 | 35.6% | -4.9 | ||
| Gonul Daniels | Conservative | Female | 4,428 | 15.2% | -1.1 | ||
| Gary Gribben | Brexit Party | Male | 1,159 | 4.0% | 0.0 |
| Election statistics | ||
| Majority | ||
| Votes | 2,781 | |
| Percent | 9.6% | |
| Rank (1 = highest %) | 521 | |
| Turnout | ||
| Constituency | 68.9% | |
| Region | 66.6% | |
| UK | 67.3% | |
| Constituency in 2017 | 68.2% | |
| Size of electorate | 42,215 | |
| Valid votes cast | 29,074 |