CONSTITUENCY RESULT : Northampton South
| Candidate name | Party | Gender | Number of votes | Share (%) | Change vs. 2017 for party (percentage points) | ||
| Andrew Lewer | Conservative | Male | 20,914 | 51.2% | +4.3 | ||
| Gareth Eales | Labour | Male | 16,217 | 39.7% | -4.3 | ||
| Jill Hope | Liberal Democrat | Female | 2,482 | 6.1% | +2.7 | ||
| Scott Mabbutt | Green | Male | 1,222 | 3.0% | +1.3 |
| Election statistics | ||
| Majority | ||
| Votes | 4,697 | |
| Percent | 11.5% | |
| Rank (1 = highest %) | 482 | |
| Turnout | ||
| Constituency | 65.7% | |
| Region | 67.2% | |
| UK | 67.3% | |
| Constituency in 2017 | 66.4% | |
| Size of electorate | 62,163 | |
| Valid votes cast | 40,835 |