| 1940 Canadian federal election: Northumberland | ||||||||
|---|---|---|---|---|---|---|---|---|
| Party | Candidate | Votes | % | ±% | ||||
| Conservative | Joseph Leonard O'Brien | 5,149 | 39.91 | +16.01 | ||||
| Liberal | John William Maloney | 5,072 | 39.32 | -16.67 | ||||
| Independent Liberal | John Patrick Barry | 2,679 | 20.77 | -35.52 | ||||
| Total valid votes | 12,900 | 100.00 | ||||||