| Election | Political Party | Elected | Votes | Magnitude |
|---|
| Federal (October 14th, 2008) | .
Conservative Party of Canada/Parti conservateur du Canada post-2003 | Rick Casson | 31714 | 1 |
| Federal (December 17th, 1917) | .
Government (Unionist) | William Ashbury Buchanan | 5302 | 1 |
| Federal (December 6th, 1921) | .
Progressive Party of Canada | Lincoln Henry Jelliff | 4961 | 1 |
| Federal (October 29th, 1925) | .
Progressive Party of Canada | Lincoln Henry Jelliff | 5399 | 1 |
| Federal (September 14th, 1926) | .
United Farmers of Alberta | Lincoln Henry Jelliff | 5138 | 1 |
| Federal (July 28th, 1930) | .
Conservative Party of Canada/Parti conservateur du Canada to 1942 | John Smith Stewart | 4863 | 1 |
| Federal (October 14th, 1935) | .
Social Credit Party of Canada | John Horne Blackmore | 6516 | 1 |
| Federal (March 26th, 1940) | .
New Democracy | John Horne Blackmore | 6362 | 1 |
| Federal (June 11th, 1945) | .
Social Credit Party of Canada | John Horne Blackmore | 7250 | 1 |
| Federal (June 27th, 1949) | .
Social Credit Party of Canada | John Horne Blackmore | 8880 | 1 |
| Federal (August 10th, 1953) | .
Social Credit Party of Canada | John Horne Blackmore | 9737 | 1 |
| Federal (June 10th, 1957) | .
Social Credit Party of Canada | John Horne Blackmore | 10910 | 1 |
| Federal (March 31st, 1958) | .
Progressive Conservative Party of Canada/Parti progressiste-conservateur du Canada | Deane Roscoe Gundlock | 13364 | 1 |
| Federal (June 18th, 1962) | .
Progressive Conservative Party of Canada/Parti progressiste-conservateur du Canada | Deane Roscoe Gundlock | 11105 | 1 |
| Federal (April 8th, 1963) | .
Progressive Conservative Party of Canada/Parti progressiste-conservateur du Canada | Deane Roscoe Gundlock | 11475 | 1 |
| Federal (November 8th, 1965) | .
Progressive Conservative Party of Canada/Parti progressiste-conservateur du Canada | Deane Roscoe Gundlock | 10147 | 1 |
| Federal (June 25th, 1968) | .
Progressive Conservative Party of Canada/Parti progressiste-conservateur du Canada | Deane Roscoe Gundlock | 11901 | 1 |
| Federal (October 30th, 1972) | .
Progressive Conservative Party of Canada/Parti progressiste-conservateur du Canada | Ken Hurlburt | 18845 | 1 |
| Federal (July 8th, 1974) | .
Progressive Conservative Party of Canada/Parti progressiste-conservateur du Canada | Ken Hurlburt | 20602 | 1 |
| Federal (May 22nd, 1979) | .
Progressive Conservative Party of Canada/Parti progressiste-conservateur du Canada | Blaine A Thacker | 29069 | 1 |
| Federal (February 18th, 1980) | .
Progressive Conservative Party of Canada/Parti progressiste-conservateur du Canada | Blaine A Thacker | 27307 | 1 |
| Federal (September 4th, 1984) | .
Progressive Conservative Party of Canada/Parti progressiste-conservateur du Canada | Blaine A Thacker | 31316 | 1 |
| Federal (November 21st, 1988) | .
Progressive Conservative Party of Canada/Parti progressiste-conservateur du Canada | Blaine A Thacker | 26750 | 1 |
| Federal (October 25th, 1993) | .
Reform Party of Canada | Raymond Albert Speaker | 24530 | 1 |
| Federal (June 2nd, 1997) | .
Reform Party of Canada | Rick Casson | 22828 | 1 |
| Federal (November 27th, 2000) | .
Canadian Alliance | Rick Casson | 30380 | 1 |
| Federal (June 28th, 2004) | .
Conservative Party of Canada/Parti conservateur du Canada post-2003 | Rick Casson | 29765 | 1 |
| Federal (January 23rd, 2006) | .
Conservative Party of Canada/Parti conservateur du Canada post-2003 | Rick Casson | 35061 | 1 |
| Federal (May 2nd, 2011) | .
Conservative Party of Canada/Parti conservateur du Canada post-2003 | Jim Hillyer | 27173 | 1 |
| Federal (October 19th, 2015) | .
Conservative Party of Canada/Parti conservateur du Canada post-2003 | Rachael Harder | 32321 | 1 |
| Federal (October 21st, 2019) | .
Conservative Party of Canada/Parti conservateur du Canada post-2003 | Rachael Harder | 40713 | 1 |
Lethbridge (Alberta)