| Election | Political Party | Elected | Votes | Magnitude |
|---|
| Federal (October 14th, 2008) | .
New Democratic Party/Nouveau Parti démocratique | Paul Dewar | 25399 | 1 |
| Federal (June 25th, 1968) | .
Liberal Party of Canada/Parti libéral du Canada | George James McIlraith | 19578 | 1 |
| Federal (October 30th, 1972) | .
Liberal Party of Canada/Parti libéral du Canada | Hugh Poulin | 14101 | 1 |
| Federal (July 8th, 1974) | .
Liberal Party of Canada/Parti libéral du Canada | Hugh Poulin | 15308 | 1 |
| Federal (May 22nd, 1979) | .
Liberal Party of Canada/Parti libéral du Canada | John Evans | 19758 | 1 |
| Federal (February 18th, 1980) | .
Liberal Party of Canada/Parti libéral du Canada | John Evans | 21659 | 1 |
| Federal (September 4th, 1984) | .
New Democratic Party/Nouveau Parti démocratique | Michael M Cassidy | 17844 | 1 |
| Federal (November 21st, 1988) | .
Liberal Party of Canada/Parti libéral du Canada | Mac Harb | 18096 | 1 |
| Federal (October 25th, 1993) | .
Liberal Party of Canada/Parti libéral du Canada | Mac Harb | 25962 | 1 |
| Federal (June 2nd, 1997) | .
Liberal Party of Canada/Parti libéral du Canada | Mac Harb | 25987 | 1 |
| Federal (November 27th, 2000) | .
Liberal Party of Canada/Parti libéral du Canada | Mac Harb | 22710 | 1 |
| Federal (June 28th, 2004) | .
New Democratic Party/Nouveau Parti démocratique | John Edward Broadbent | 25734 | 1 |
| Federal (January 23rd, 2006) | .
New Democratic Party/Nouveau Parti démocratique | Paul Dewar | 24609 | 1 |
| Federal (May 2nd, 2011) | .
New Democratic Party/Nouveau Parti démocratique | Paul Dewar | 33805 | 1 |
| Federal (October 19th, 2015) | .
Liberal Party of Canada/Parti libéral du Canada | Catherine Mary McKenna | 32211 | 1 |
| Federal (October 21st, 2019) | .
Liberal Party of Canada/Parti libéral du Canada | Catherine Mary McKenna | 38391 | 1 |
Ottawa Centre/Ottawa-Centre (Ontario)