Siobhain McDonagh Elections won
Parliament Member page for Siobhain McDonagh
Elections listed as contested and won are those forming part of the general elections in 2010, 2015, 2017, 2019 or 2024. A person may have contested or contested and won an election outside this grouping.
| Election | Constituency | Election type | Party | Vote count | Vote share | Majority |
| 4 July 2024 | Mitcham and Morden | General election | Lab | 25,085 | 55.4% | 18,761 |
| 12 December 2019 | Mitcham and Morden | General election | Lab | 27,964 | 61.1% | 16,482 |
| 8 June 2017 | Mitcham and Morden | General election | Lab | 33,039 | 68.7% | 21,375 |
| 7 May 2015 | Mitcham and Morden | General election | Lab | 27,380 | 60.7% | 16,922 |
| 6 May 2010 | Mitcham and Morden | General election | Lab | 24,722 | 56.4% | 13,666 |