CONSTITUENCY RESULT : Monmouth
| Candidate name | Party | Gender | Number of votes | Share (%) | Change vs. 2017 for party (percentage points) | ||
| David T. C. Davies | Conservative | Male | 26,160 | 52.1% | -1.0 | ||
| Yvonne Murphy | Labour | Female | 16,178 | 32.2% | -4.4 | ||
| Alison Willott | Liberal Democrat | Female | 4,909 | 9.8% | +5.6 | ||
| Ian Chandler | Green | Male | 1,353 | 2.7% | +0.8 | ||
| Hugh Kocan | Plaid Cymru | Male | 1,182 | 2.4% | -0.3 | ||
| Martyn Ford | Independent | Male | 435 | 0.9% | 0.0 |
| Election statistics | ||
| Majority | ||
| Votes | 9,982 | |
| Percent | 19.9% | |
| Rank (1 = highest %) | 367 | |
| Turnout | ||
| Constituency | 74.8% | |
| Region | 66.6% | |
| UK | 67.3% | |
| Constituency in 2017 | 76.6% | |
| Size of electorate | 67,098 | |
| Valid votes cast | 50,217 |