# Monmouth (UK Parliament constituency)

Monmouth (Welsh: Mynwy) was a county constituency of the House of Commons of the Parliament of the United Kingdom (at Westminster). The seat was created for the 1918 general election. From 2005 until 2024 the Member of Parliament (MP) was David Davies of the Conservative Party.
The Monmouth Senedd constituency was created in 1999 with the same boundaries as the Westminster constituency. These covered a large area, omitting the mainly urban areas of Blaenau Gwent in the west and Newport, Wales in the south.
The constituency was abolished as part of the 2023 Periodic Review of Westminster constituencies and under the June 2023 final recommendations of the Boundary Commission for Wales for the 2024 general election. Its wards were split between Monmouthshire and Torfaen.

## History

The constituency was considered a safe seat of the Conservative Party although the seat has been won by the Labour Party in three general elections – in addition to the 1991 by-election.
The last MP for Monmouth was the Conservative David T. C. Davies, elected in 2005 and a former member for the Senedd seat of the same name. To avoid confusion with the Yorkshire Conservative David Davis, he is named in Hansard as "David T. C. Davies".

## Boundaries
### 1983 to 2024

The constituency was one of eight covering the preserved county of Gwent. The other seven were Blaenau Gwent, Caerphilly, Islwyn, Merthyr Tydfil and Rhymney, Newport East, Newport West and Torfaen. Merthyr Tydfil and Rhymney, however, straddles the boundary with the preserved county of Mid Glamorgan. It covered most of the local authority of Monmouthshire, with the main towns being Chepstow, Monmouth and Abergavenny.
For the 2010 general election, there were no changes to the boundaries of the Monmouth constituency stemming from the Fifth Review of the Boundary Commission for Wales. Likewise there were no boundary changes in 1997.

### 1918 to 1983

As first used in the 1918 general election, the constituency was a creation of the Representation of the People Act 1918 as one of six constituencies covering the county of Monmouth. Prior to the 1918 election the county had been covered, nominally, by the county constituencies of Northern Monmouthshire, Southern Monmouthshire, and Western Monmouthshire, and the Monmouth Boroughs borough constituency. By 1918, however, administrative county boundaries were out of alignment with constituency boundaries. The new constituency boundaries took account of the new local government boundaries.
The other Monmouthshire constituencies defined by the 1918 legislation were the county constituencies of Abertillery, Bedwellty, Ebbw Vale and Pontypool, and the borough constituency of Newport. This general pattern was maintained until 1983, nine years after the administrative county they were based on had been abolished, but there were some boundary changes during the 1918 to 1983 period.
In 1918 the Monmouth constituency was defined as consisting of the municipal boroughs of Abergavenny, and Monmouth, the urban districts of Caerleon, Chepstow, and Usk, the rural districts of Abergavenny, Chepstow, Magor, Monmouth, Cwmbran and Pontypool, and part of the rural district of St Mellons. The same boundaries were used for the general elections of 1922, 1923, 1924, 1929, 1931, 1935 and 1945.
New boundaries, created by the House of Commons (Redistribution of Seats) Act 1949, were used for the 1950 general election, and the Monmouth constituency was defined as consisting of the municipal boroughs of Abergavenny and Monmouth, the urban districts of Caerleon, Chepstow, Cwmbran and Usk, and the rural districts of Abergavenny, Chepstow, Magor and St Mellons, Monmouth, and Pontypool.
For the 1951 general election, there was some alteration to the boundaries of rural district of Magor and St Mellons.
The constituency was redefined again for the 1955 general election, taking account of new local government boundaries. The result was the same list of boroughs and districts as for the 1951 election. 1951 boundaries were used also in the general elections of 1959, 1964, 1966, 1970, February 1974, October 1974 and 1979.
In 1974, under the Local Government Act 1972, the local government county of Monmouth was abolished. For the 1983 general election, new constituency boundaries were drawn, taking account of new local government boundaries.

## Members of Parliament

The following list does not include MPs who actually represented Monmouth Boroughs:
| Election | Member | Party |
| 1918 | Leolin Forestier-Walker | Conservative |
| 1934 by-election | John Herbert | Conservative |
| 1939 by-election | Leslie Pym | Conservative |
| 1945 by-election | Peter Thorneycroft | Conservative |
| 1966 | Donald Anderson | Labour |
| 1970 | Sir John Stradling Thomas | Conservative |
| 1991 by-election | Huw Edwards | Labour |
| 1992 | Roger Evans | Conservative |
| 1997 | Huw Edwards | Labour |
| 2005 | David Davies | Conservative |
| 2024 | Constituency abolished | Constituency abolished |

## Elections
### Elections in the 1910s

General election 1918: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Unionist | Leolin Forestier-Walker | 9,164 | 59.7 | N/A |
| | Liberal | Hubert Martineau | 6,189 | 40.3 | N/A |
| Majority | Majority | Majority | 2,975 | 19.4 | N/A |
| Turnout | Turnout | Turnout | 15,353 | 55.7 | N/A |
| Registered electors | Registered electors | Registered electors | 27,575 | | |
| | Unionist win (new seat) | Unionist win (new seat) | Unionist win (new seat) | Unionist win (new seat) | Unionist win (new seat) |

### Elections in the 1920s

General election 1922: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Unionist | Leolin Forestier-Walker | Unopposed | Unopposed | Unopposed |
| Registered electors | Registered electors | Registered electors | 29,779 | | |
| | Unionist hold | Unionist hold | Unionist hold | Unionist hold | Unionist hold |
General election 1923: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Unionist | Leolin Forestier-Walker | 12,697 | 59.9 | N/A |
| | Liberal | Morgan Griffith | 8,487 | 40.1 | N/A |
| Majority | Majority | Majority | 4,210 | 19.8 | N/A |
| Turnout | Turnout | Turnout | 21,184 | 80.9 | N/A |
| Registered electors | Registered electors | Registered electors | 29,889 | | |
| | Unionist hold | Unionist hold | Swing | N/A | |
General election 1924: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Unionist | Leolin Forestier-Walker | 16,510 | 71.8 | +11.9 |
| | Labour | Luke Bateman | 6,469 | 28.2 | N/A |
| Majority | Majority | Majority | 10,041 | 43.6 | −20.2 |
| Turnout | Turnout | Turnout | 22,979 | 74.1 | +3.2 |
| Registered electors | Registered electors | Registered electors | 31,031 | | |
| | Unionist hold | Unionist hold | Swing | | |
General election 1929: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Unionist | Leolin Forestier-Walker | 16,353 | 49.3 | −22.5 |
| | Liberal | Richard Charles Williams | 8,582 | 25.8 | N/A |
| | Labour | Luke Bateman | 8,268 | 24.9 | −3.3 |
| Majority | Majority | Majority | 7,771 | 23.5 | −20.1 |
| Turnout | Turnout | Turnout | 33,203 | 78.9 | +4.8 |
| Registered electors | Registered electors | Registered electors | 42,070 | | |
| | Unionist hold | Unionist hold | Swing | | |

### Elections in the 1930s

General election 1931: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Leolin Forestier-Walker | 24,829 | 70.8 | +21.5 |
| | Labour | D. Hughes | 10,217 | 29.2 | +4.3 |
| Majority | Majority | Majority | 14,612 | 41.6 | +18.1 |
| Turnout | Turnout | Turnout | 45,046 | 78.0 | −0.9 |
| Registered electors | Registered electors | Registered electors | 44,929 | | |
| | Conservative hold | Conservative hold | Swing | | |
1934 Monmouth by-election :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | John Herbert | 20,640 | 65.0 | −5.8 |
| | Labour | D. Hughes | 11,094 | 35.0 | +5.8 |
| Majority | Majority | Majority | 9,546 | 30.0 | −11.6 |
| Turnout | Turnout | Turnout | 31,734 | 69.2 | −8.8 |
| Registered electors | Registered electors | Registered electors | 45,885 | | |
| | Conservative hold | Conservative hold | Swing | -5.8 | |
General election 1935: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | John Herbert | 23,262 | 63.4 | −7.4 |
| | Labour | Michael Mackintosh Foot | 13,454 | 36.6 | +7.4 |
| Majority | Majority | Majority | 9,808 | 26.8 | −14.8 |
| Turnout | Turnout | Turnout | 36,716 | 76.8 | −1.4 |
| Registered electors | Registered electors | Registered electors | 47,792 | | |
| | Conservative hold | Conservative hold | Swing | -1.6 | |
1939 Monmouth by-election :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Leslie Pym | 17,358 | 60.1 | −3.3 |
| | Labour | Frank Rivers Hancock | 11,543 | 39.9 | +3.3 |
| Majority | Majority | Majority | 5,815 | 20.2 | −6.6 |
| Turnout | Turnout | Turnout | 28,901 | 58.2 | −18.6 |
| Registered electors | Registered electors | Registered electors | 49,690 | | |
| | Conservative hold | Conservative hold | Swing | -3.3 | |

### Elections in the 1940s

General election 1945: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Leslie Pym | 22,195 | 51.9 | −11.5 |
| | Labour | A B L Oakley | 20,543 | 48.1 | +11.5 |
| Majority | Majority | Majority | 1,652 | 3.8 | −23.0 |
| Turnout | Turnout | Turnout | 42,738 | 72.0 | −4.8 |
| Registered electors | Registered electors | Registered electors | 59,359 | | |
| | Conservative hold | Conservative hold | Swing | -8.2 | |
1945 Monmouth by-election :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Peter Thorneycroft | 21,092 | 52.7 | +0.8 |
| | Labour | A B L Oakley | 18,953 | 47.3 | −0.8 |
| Majority | Majority | Majority | 2,139 | 5.4 | +1.6 |
| Turnout | Turnout | Turnout | 40,045 | 39.8 | −32.2 |
| Registered electors | Registered electors | Registered electors | 60,013 | | |
| | Conservative hold | Conservative hold | Swing | +0.8 | |

### Elections in the 1950s

General election 1950: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Peter Thorneycroft | 21,956 | 55.3 | +3.4 |
| | Labour | G P Thomas | 17,725 | 44.7 | −3.4 |
| Majority | Majority | Majority | 4,231 | 10.6 | +6.8 |
| Turnout | Turnout | Turnout | 39,681 | 83.1 | +11.1 |
| Registered electors | Registered electors | Registered electors | 47,725 | | |
| | Conservative hold | Conservative hold | Swing | | |
General election 1951: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Peter Thorneycroft | 22,475 | 55.6 | +0.3 |
| | Labour | Josephine Richardson | 17,952 | 44.4 | −0.3 |
| Majority | Majority | Majority | 4,523 | 11.2 | +0.6 |
| Turnout | Turnout | Turnout | 40,247 | 83.7 | +0.6 |
| Registered electors | Registered electors | Registered electors | 48,314 | | |
| | Conservative hold | Conservative hold | Swing | | |
General election 1955: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Peter Thorneycroft | 22,970 | 57.2 | +1.6 |
| | Labour | Josephine Richardson | 17,173 | 42.8 | −1.6 |
| Majority | Majority | Majority | 5,797 | 14.4 | +3.2 |
| Turnout | Turnout | Turnout | 40,143 | 81.5 | −2.2 |
| Registered electors | Registered electors | Registered electors | 49,252 | | |
| | Conservative hold | Conservative hold | Swing | | |
General election 1959: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Peter Thorneycroft | 25,422 | 57.0 | −0.2 |
| | Labour | Gordon Parry | 19,165 | 43.0 | +0.2 |
| Majority | Majority | Majority | 6,257 | 14.0 | −0.4 |
| Turnout | Turnout | Turnout | 44,587 | 83.1 | +1.6 |
| Registered electors | Registered electors | Registered electors | 53,628 | | |
| | Conservative hold | Conservative hold | Swing | | |

### Elections in the 1960s

General election 1964: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Peter Thorneycroft | 22,635 | 44.1 | −12.9 |
| | Labour | A Calvin Kerr | 21,921 | 42.7 | −0.3 |
| | Liberal | D Hywell Davies | 6,764 | 13.2 | N/A |
| Majority | Majority | Majority | 714 | 1.4 | −12.6 |
| Turnout | Turnout | Turnout | 51,050 | 84.4 | +1.3 |
| Registered electors | Registered electors | Registered electors | 60,803 | | |
| | Conservative hold | Conservative hold | Swing | | |
General election 1966: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Labour | Donald Anderson | 28,619 | 52.7 | +10.0 |
| | Conservative | Peter Thorneycroft | 25,654 | 47.3 | +3.2 |
| Majority | Majority | Majority | 2,965 | 5.4 | N/A |
| Turnout | Turnout | Turnout | 54,273 | 84.3 | −0.1 |
| Registered electors | Registered electors | Registered electors | 64,356 | | |
| | Labour gain from Conservative | Labour gain from Conservative | Swing | | |

### Elections in the 1970s

General election 1970: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | John Stradling Thomas | 28,312 | 46.5 | −0.8 |
| | Labour | Donald Anderson | 26,957 | 44.3 | −8.4 |
| | Liberal | David H Hando | 4,601 | 6.7 | N/A |
| | Plaid Cymru | Stuart K Neale | 1,501 | 2.5 | N/A |
| Majority | Majority | Majority | 1,355 | 2.2 | N/A |
| Turnout | Turnout | Turnout | 61,371 | 80.5 | −3.8 |
| Registered electors | Registered electors | Registered electors | 75,602 | | |
| | Conservative gain from Labour | Conservative gain from Labour | Swing | | |
General election February 1974: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | John Stradling Thomas | 27,269 | 43.7 | −2.8 |
| | Labour | F R Thompson | 22,707 | 36.4 | −7.9 |
| | Liberal | David H Hando | 11,506 | 18.4 | +11.7 |
| | Plaid Cymru | E H Spanwick | 930 | 1.5 | −1.0 |
| Majority | Majority | Majority | 4,562 | 7.3 | +5.1 |
| Turnout | Turnout | Turnout | 62,412 | 84.1 | +3.6 |
| Registered electors | Registered electors | Registered electors | 74,173 | | |
| | Conservative hold | Conservative hold | Swing | | |
General election October 1974: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | John Stradling Thomas | 25,460 | 42.8 | −0.9 |
| | Labour | Richard Faulkner | 23,118 | 36.9 | +0.5 |
| | Liberal | David H Hando | 10,076 | 16.9 | −1.5 |
| | Plaid Cymru | T Brimmacombe | 839 | 1.4 | −0.1 |
| Majority | Majority | Majority | 2,342 | 3.9 | −4.4 |
| Turnout | Turnout | Turnout | 59,493 | 79.5 | −4.6 |
| Registered electors | Registered electors | Registered electors | 74,838 | | |
| | Conservative hold | Conservative hold | Swing | | |
General election 1979: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | John Stradling Thomas | 33,547 | 50.5 | +7.7 |
| | Labour | T M Steel | 23,785 | 35.8 | −1.1 |
| | Liberal | David H Hando | 8,494 | 12.8 | −4.1 |
| | Plaid Cymru | Gwyn Williams | 641 | 1.0 | −0.4 |
| Majority | Majority | Majority | 9,762 | 14.7 | +10.8 |
| Turnout | Turnout | Turnout | 66,467 | 83.0 | +3.5 |
| Registered electors | Registered electors | Registered electors | 80,085 | | |
| | Conservative hold | Conservative hold | Swing | | |

### Elections in the 1980s

General election 1983: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | John Stradling Thomas | 21,746 | 49.2 | −1.3 |
| | SDP | Clive Lindley | 12,403 | 28.0 | +15.2 |
| | Labour | Christopher Short | 9,593 | 21.7 | −14.1 |
| | Plaid Cymru | Gwynddri Williams | 493 | 1.1 | +0.1 |
| Majority | Majority | Majority | 9,343 | 21.2 | +6.5 |
| Turnout | Turnout | Turnout | 44,235 | 78.8 | −4.2 |
| Registered electors | Registered electors | Registered electors | 56,112 | | |
| | Conservative hold | Conservative hold | Swing | | |
General election 1987: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | John Stradling Thomas | 22,387 | 47.5 | −1.7 |
| | Labour | Katrina Gass | 13,037 | 27.7 | +6.0 |
| | SDP | Clive Lindley | 11,313 | 24.0 | −4.0 |
| | Plaid Cymru | Sian Meredudd | 363 | 0.8 | −0.3 |
| Majority | Majority | Majority | 9,530 | 19.8 | −1.4 |
| Turnout | Turnout | Turnout | 47,100 | 80.8 | +2.0 |
| Registered electors | Registered electors | Registered electors | 58,468 | | |
| | Conservative hold | Conservative hold | Swing | −2.2 | |

### Elections in the 1990s

1991 Monmouth by-election :
| Party | Party | Candidate | Votes | % | ±% |
| | Labour | Huw Edwards | 17,733 | 39.3 | +11.6 |
| | Conservative | Roger Evans | 15,327 | 34.0 | −13.5 |
| | Liberal Democrats | Frances David | 11,164 | 24.8 | N/A |
| | Monster Raving Loony | Screaming Lord Sutch | 314 | 0.7 | N/A |
| | Plaid Cymru (Green) | Melvin Witherden | 277 | 0.6 | −0.2 |
| | Unitax Independent | Peter Carpenter | 164 | 0.4 | N/A |
| | Corrective Party | Lindi St Clair | 121 | 0.3 | N/A |
| Majority | Majority | Majority | 2,406 | 5.3 | N/A |
| Turnout | Turnout | Turnout | 45,100 | 75.8 | −5.0 |
| Registered electors | Registered electors | Registered electors | 59,460 | | |
| | Labour gain from Conservative | Labour gain from Conservative | Swing | -12.6 | |
General election 1992: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | Roger Evans | 24,059 | 47.3 | −0.2 |
| | Labour | Huw Edwards | 20,855 | 41.0 | +13.3 |
| | Liberal Democrats | Frances David | 5,562 | 10.9 | −13.1 |
| | Plaid Cymru (Green) | Melvin Witherden | 431 | 0.8 | ±0.0 |
| Majority | Majority | Majority | 3,204 | 6.3 | −13.5 |
| Turnout | Turnout | Turnout | 50,907 | 86.1 | +5.3 |
| Registered electors | Registered electors | Registered electors | 59,147 | | |
| | Conservative hold | Conservative hold | Swing | −6.8 | |
General election 1997: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Labour | Huw Edwards | 23,404 | 47.7 | +6.7 |
| | Conservative | Roger Evans | 19,226 | 39.2 | −8.1 |
| | Liberal Democrats | Mark Williams | 4,689 | 9.6 | −1.3 |
| | Referendum | Timothy Warry | 1,190 | 2.4 | N/A |
| | Plaid Cymru | Alan Cotton | 516 | 1.1 | +0.3 |
| Majority | Majority | Majority | 4,178 | 8.5 | N/A |
| Turnout | Turnout | Turnout | 49,025 | 80.5 | −5.6 |
| Registered electors | Registered electors | Registered electors | 60,873 | | |
| | Labour gain from Conservative | Labour gain from Conservative | Swing | +7.4 | |

### Elections in the 2000s

General election 2001: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Labour | Huw Edwards | 19,021 | 42.8 | −4.9 |
| | Conservative | Roger Evans | 18,637 | 41.9 | +2.7 |
| | Liberal Democrats | Neil Parker | 5,080 | 11.4 | +1.8 |
| | Plaid Cymru | Marc Hubbard | 1,068 | 2.4 | +1.3 |
| | UKIP | David Rowlands | 656 | 1.5 | N/A |
| Majority | Majority | Majority | 384 | 0.9 | −7.6 |
| Turnout | Turnout | Turnout | 44,462 | 71.5 | −9.0 |
| Registered electors | Registered electors | Registered electors | 62,200 | | |
| | Labour hold | Labour hold | Swing | −3.8 | |
General election 2005: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | David Davies | 21,396 | 46.9 | +5.0 |
| | Labour | Huw Edwards | 16,869 | 37.0 | −5.8 |
| | Liberal Democrats | Phylip A. D. Hobson | 5,852 | 12.8 | +1.4 |
| | Plaid Cymru | Jonathan Clark | 993 | 2.2 | −0.2 |
| | UKIP | John Bufton | 543 | 1.2 | −0.3 |
| Majority | Majority | Majority | 4,527 | 9.9 | N/A |
| Turnout | Turnout | Turnout | 45,653 | 72.4 | +0.9 |
| Registered electors | Registered electors | Registered electors | 62,233 | | |
| | Conservative gain from Labour | Conservative gain from Labour | Swing | +5.4 | |

### Elections in the 2010s

General election 2010: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | David Davies | 22,466 | 48.3 | +1.4 |
| | Labour | Hamish Sandison | 12,041 | 25.9 | −11.1 |
| | Liberal Democrats | Martin Blakebrough | 9,026 | 19.4 | +6.6 |
| | Plaid Cymru | Jonathan Clark | 1,273 | 2.7 | +0.5 |
| | UKIP | Derek Rowe | 1,126 | 2.4 | +1.2 |
| | Green | Steve Millson | 587 | 1.3 | N/A |
| Rejected ballots | Rejected ballots | Rejected ballots | 75 | | |
| Majority | Majority | Majority | 10,425 | 22.4 | +12.5 |
| Turnout | Turnout | Turnout | 46,519 | 72.2 | −0.2 |
| Registered electors | Registered electors | Registered electors | 64,538 | | |
| | Conservative hold | Conservative hold | Swing | +6.2 | |
Of the 75 rejected ballots:
* 54 were either unmarked or it was uncertain who the vote was for.
* 20 voted for more than one candidate.
* 1 had writing or mark by which the voter could be identified.
General election 2015: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | David Davies | 23,701 | 49.9 | +1.6 |
| | Labour | Ruth Jones | 12,719 | 26.8 | +0.9 |
| | UKIP | Gareth Dunn | 4,942 | 10.4 | +8.0 |
| | Liberal Democrats | Veronica German | 2,496 | 5.3 | −14.1 |
| | Plaid Cymru | Jonathan Clark | 1,875 | 3.9 | +1.2 |
| | Green | Christopher Were | 1,629 | 3.4 | +2.1 |
| | English Democrat | Stephen Morris | 100 | 0.2 | N/A |
| Rejected ballots | Rejected ballots | Rejected ballots | 104 | | |
| Majority | Majority | Majority | 10,982 | 23.1 | +0.7 |
| Turnout | Turnout | Turnout | 47,462 | 76.2 | +4.0 |
| Registered electors | Registered electors | Registered electors | 62,248 | | |
| | Conservative hold | Conservative hold | Swing | +0.3 | |
Of the 104 rejected ballots:
* 70 were either unmarked or it was uncertain who the vote was for.
* 30 voted for more than one candidate.
* 4 had writing or mark by which the voter could be identified.
General election 2017: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | David Davies | 26,411 | 53.1 | +3.2 |
| | Labour | Ruth Jones | 18,205 | 36.6 | +9.8 |
| | Liberal Democrats | Veronica German | 2,064 | 4.2 | −1.1 |
| | Plaid Cymru | Carole Damon | 1,338 | 2.7 | −1.2 |
| | Green | Ian Chandler | 954 | 1.9 | −1.5 |
| | UKIP | Roy Neale | 762 | 1.5 | −8.9 |
| Rejected ballots | Rejected ballots | Rejected ballots | 64 | | |
| Majority | Majority | Majority | 8,206 | 16.5 | −6.6 |
| Turnout | Turnout | Turnout | 49,734 | 76.6 | +0.4 |
| Registered electors | Registered electors | Registered electors | 64,909 | | |
| | Conservative hold | Conservative hold | Swing | -3.3 | |
Of the 64 rejected ballots:
* 57 were either unmarked or it was uncertain who the vote was for.
* 7 voted for more than one candidate.
General election 2019: Monmouth :
| Party | Party | Candidate | Votes | % | ±% |
| | Conservative | David Davies | 26,160 | 52.1 | −1.0 |
| | Labour | Yvonne Murphy | 16,178 | 32.2 | −4.4 |
| | Liberal Democrats | Alison Willott | 4,909 | 9.8 | +5.6 |
| | Green | Ian Chandler | 1,353 | 2.7 | +0.8 |
| | Plaid Cymru | Hugh Kocan | 1,182 | 2.4 | −0.3 |
| | Independent | Martyn Ford | 435 | 0.9 | N/A |
| Rejected ballots | Rejected ballots | Rejected ballots | 136 | | |
| Majority | Majority | Majority | 9,982 | 19.9 | +3.4 |
| Turnout | Turnout | Turnout | 50,217 | 74.8 | −1.8 |
| Registered electors | Registered electors | Registered electors | 67,094 | | |
| | Conservative hold | Conservative hold | Swing | +1.7 | |
Of the 136 rejected ballots:
* 112 were either unmarked or it was uncertain who the vote was for.
* 24 voted for more than one candidate.