List of senators in the 42nd Parliament of Canada
# List of senators in the 42nd Parliament of Canada

This is a list of members of the Senate of Canada in the 42nd Canadian Parliament.

## List of senators

| Name | Party | Province (Division) | Date appointed | Appointed by | Left office | Reason | Start | End |
| - | - | - | - | - | - | - | - | - |
| Margaret Dawn Anderson | Non-affiliated | Northwest Territories | December 12, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Margaret Dawn Anderson | Independent Senators Group | Northwest Territories | December 12, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Raynell Andreychuk | Conservative | Saskatchewan | March 11, 1993 | Mulroney | August 14, 2019 | Retirement | Yes | No |
| Salma Ataullahjan | Conservative | Ontario | July 9, 2010 | Harper | Incumbent | | Yes | Yes |
| George Baker | Liberal (Senate caucus) | Newfoundland and Labrador | March 26, 2002 | Chrétien | September 4, 2017 | Retirement | Yes | No |
| Denise Batters | Conservative | Saskatchewan | January 25, 2013 | Harper | Incumbent | | Yes | Yes |
| Diane Bellemare | Conservative | Quebec (Alma) | September 6, 2012 | Harper | Incumbent | | Yes | Yes |
| Diane Bellemare | Non-affiliated | Quebec (Alma) | September 6, 2012 | Harper | Incumbent | | Yes | Yes |
| Wanda Thomas Bernard | Non-affiliated | Nova Scotia | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Wanda Thomas Bernard | Independent Senators Group | Nova Scotia | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Lynn Beyak | Conservative | Ontario | January 25, 2013 | Harper | Incumbent | | Yes | Yes |
| Lynn Beyak | Non-affiliated | Ontario | January 25, 2013 | Harper | Incumbent | | Yes | Yes |
| Doug Black | Conservative | Alberta | January 25, 2013 | Harper | Incumbent | | Yes | Yes |
| Doug Black | Non-affiliated | Alberta | January 25, 2013 | Harper | Incumbent | | Yes | Yes |
| Doug Black | Independent Senators Group | Alberta | January 25, 2013 | Harper | Incumbent | | Yes | Yes |
| Robert Black | Non-affiliated | Ontario (Centre Wellington) | February 15, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Robert Black | Independent Senators Group | Ontario (Centre Wellington) | February 15, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Peter Boehm | Non-affiliated | Ontario | October 3, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Peter Boehm | Independent Senators Group | Ontario | October 3, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Pierre-Hugues Boisvenu | Non-affiliated | Quebec (La Salle) | January 29, 2010 | Harper | Incumbent | | Yes | Yes |
| Pierre-Hugues Boisvenu | Conservative | Quebec (La Salle) | January 29, 2010 | Harper | Incumbent | | Yes | Yes |
| Gwen Boniface | Non-affiliated | Ontario | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Gwen Boniface | Independent Senators Group | Ontario | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Patricia Bovey | Non-affiliated | Manitoba | November 10, 2016 | Trudeau, J. | May 15, 2023 | Retirement | No | Yes |
| Patricia Bovey | Independent Senators Group | Manitoba | November 10, 2016 | Trudeau, J. | May 15, 2023 | Retirement | No | Yes |
| Yvonne Boyer | Non-affiliated | Ontario | March 15, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Yvonne Boyer | Independent Senators Group | Ontario | March 15, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Patrick Brazeau | Non-affiliated | Quebec (Repentigny) | January 8, 2009 | Harper | Incumbent | | Yes | Yes |
| Patrick Brazeau | Independent Senators Group | Quebec (Repentigny) | January 8, 2009 | Harper | Incumbent | | Yes | Yes |
| Bev Busson | Non-affiliated | British Columbia | September 24, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Bev Busson | Independent Senators Group | British Columbia | September 24, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Larry Campbell | Liberal (Senate caucus) | British Columbia (Vancouver) | August 2, 2005 | Martin | Incumbent | | Yes | Yes |
| Larry Campbell | Non-affiliated | British Columbia (Vancouver) | August 2, 2005 | Martin | Incumbent | | Yes | Yes |
| Larry Campbell | Independent Senators Group | British Columbia (Vancouver) | August 2, 2005 | Martin | Incumbent | | Yes | Yes |
| Claude Carignan | Conservative | Quebec (Mille Isles) | August 27, 2009 | Harper | Incumbent | | Yes | Yes |
| Maria Chaput | Liberal (Senate caucus) | Manitoba | December 12, 2002 | Chrétien | March 1, 2016 | Resignation (Illness) | Yes | No |
| Daniel Christmas | Non-affiliated | Nova Scotia | December 6, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Daniel Christmas | Independent Senators Group | Nova Scotia | December 6, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Anne Cools | Non-affiliated | Ontario (Toronto-Centre-York) | January 13, 1984 | Trudeau, P. E. | August 12, 2018 | Retirement | Yes | No |
| Anne Cools | Independent Senators Group | Ontario (Toronto-Centre-York) | January 13, 1984 | Trudeau, P. E. | August 12, 2018 | Retirement | Yes | No |
| Jane Cordy | Liberal (Senate caucus) | Nova Scotia | June 9, 2000 | Chrétien | Incumbent | | Yes | Yes |
| René Cormier | Non-affiliated | Manitoba | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| René Cormier | Independent Senators Group | Manitoba | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Jim Cowan | Liberal (Senate caucus) | Nova Scotia (Halifax) | March 24, 2005 | Martin | January 22, 2017 | Retirement | Yes | No |
| Mary Coyle | Non-affiliated | Nova Scotia (Antigonish) | December 4, 2017 | Trudeau, J. | Incumbent | | No | Yes |
| Mary Coyle | Independent Senators Group | Nova Scotia (Antigonish) | December 4, 2017 | Trudeau, J. | Incumbent | | No | Yes |
| Jean-Guy Dagenais | Conservative | Quebec | January 17, 2012 | Harper | Incumbent | | Yes | Yes |
| Pierre Dalphond | Non-affiliated | Quebec (De Lorimier) | June 6, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Pierre Dalphond | Independent Senators Group | Quebec (De Lorimier) | June 6, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Donna Dasko | Non-affiliated | Ontario | June 6, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Donna Dasko | Independent Senators Group | Ontario | June 6, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Dennis Dawson | Liberal (Senate caucus) | Quebec (Lauzon) | August 2, 2005 | Martin | Incumbent | | Yes | Yes |
| Joseph A. Day | Liberal (Senate caucus) | New Brunswick (Saint John-Kennebecasis) | October 4, 2001 | Chrétien | January 24, 2020 | Retirement | Yes | Yes |
| Colin Deacon | Non-affiliated | Nova Scotia | June 15, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Colin Deacon | Independent Senators Group | Nova Scotia | June 15, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Marty Deacon | Non-affiliated | Ontario (Waterloo) | February 15, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Marty Deacon | Independent Senators Group | Ontario (Waterloo) | February 15, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Tony Dean | Non-affiliated | Ontario | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Tony Dean | Independent Senators Group | Ontario | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Jacques Demers | Conservative | Quebec (Rigaud) | August 27, 2009 | Harper | August 25, 2019 | Retirement | Yes | No |
| Jacques Demers | Non-affiliated | Quebec (Rigaud) | August 27, 2009 | Harper | August 25, 2019 | Retirement | Yes | No |
| Jacques Demers | Independent Senators Group | Quebec (Rigaud) | August 27, 2009 | Harper | August 25, 2019 | Retirement | Yes | No |
| Percy Downe | Liberal (Senate caucus) | Prince Edward Island (Charlottetown) | June 26, 2003 | Chrétien | Incumbent | | Yes | Yes |
| Norman Doyle | Conservative | Newfoundland and Labrador | January 6, 2012 | Harper | Incumbent | | Yes | Yes |
| Mike Duffy | Non-affiliated | Prince Edward Island (Cavendish) | January 2, 2009 | Harper | Incumbent | | Yes | Yes |
| Mike Duffy | Independent Senators Group | Prince Edward Island (Cavendish) | January 2, 2009 | Harper | Incumbent | | Yes | Yes |
| Pat Duncan | Non-affiliated | Yukon | December 12, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Pat Duncan | Independent Senators Group | Yukon | December 12, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Renée Dupuis | Non-affiliated | Quebec (The Laurentides) | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Renée Dupuis | Independent Senators Group | Quebec (The Laurentides) | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Lillian Dyck | Liberal (Senate caucus) | Saskatchewan (North Battleford) | March 24, 2005 | Martin | Incumbent | | Yes | Yes |
| Nicole Eaton | Conservative | Ontario (Caledon) | January 2, 2009 | Harper | Incumbent | | Yes | Yes |
| Art Eggleton | Liberal (Senate caucus) | Ontario (Toronto) | March 24, 2005 | Martin | September 29, 2018 | Retirement | Yes | No |
| Tobias Enverga | Conservative | Ontario | September 6, 2012 | Harper | November 16, 2017 | Death | Yes | No |
| Éric Forest | Non-affiliated | Quebec | November 21, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Éric Forest | Independent Senators Group | Quebec | November 21, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Josée Forest-Niesing | Non-affiliated | Ontario | October 11, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Josée Forest-Niesing | Independent Senators Group | Ontario | October 11, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Brian Francis | Non-affiliated | Prince Edward Island | October 11, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Brian Francis | Independent Senators Group | Prince Edward Island | October 11, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Joan Fraser | Liberal (Senate caucus) | Quebec (De Lorimier) | September 17, 1998 | Chrétien | February 2, 2018 | Resignation | Yes | No |
| Linda Frum | Conservative | Ontario | August 27, 2009 | Harper | Incumbent | | Yes | Yes |
| George Furey | Liberal (Senate caucus) | Newfoundland and Labrador | August 11, 1999 | Chrétien | May 12, 2023 | Retirement | Yes | Yes |
| George Furey | Non-affiliated | Newfoundland and Labrador | August 11, 1999 | Chrétien | May 12, 2023 | Retirement | Yes | Yes |
| Raymonde Gagné | Non-affiliated | Manitoba | April 1, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Raymonde Gagné | Independent Senators Group | Manitoba | April 1, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Rosa Galvez | Non-affiliated | Quebec | December 6, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Rosa Galvez | Independent Senators Group | Quebec | December 6, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Irving Gerstein | Conservative | Ontario (Toronto) | January 2, 2009 | Harper | February 10, 2016 | Retirement | Yes | No |
| Marc Gold | Non-affiliated | Quebec (Stadacona) | November 25, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Marc Gold | Independent Senators Group | Quebec (Stadacona) | November 25, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Stephen Greene | Conservative | Nova Scotia (Halifax — The Citadel) | January 2, 2009 | Harper | Incumbent | | Yes | Yes |
| Stephen Greene | Non-affiliated (Independent Reform) | Nova Scotia (Halifax — The Citadel) | January 2, 2009 | Harper | Incumbent | | Yes | Yes |
| Stephen Greene | Independent Senators Group | Nova Scotia (Halifax — The Citadel) | January 2, 2009 | Harper | Incumbent | | Yes | Yes |
| Diane Griffin | Non-affiliated | Prince Edward Island | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Diane Griffin | Independent Senators Group | Prince Edward Island | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Peter Harder | Non-affiliated | Ontario (Ottawa) | March 23, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Nancy Hartling | Non-affiliated | New Brunswick | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Nancy Hartling | Independent Senators Group | New Brunswick | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Céline Hervieux-Payette | Liberal (Senate caucus) | Quebec (Bedford) | March 21, 1995 | Chrétien | April 22, 2016 | Retirement | Yes | No |
| Leo Housakos | Conservative | Quebec (Wellington) | January 8, 2009 | Harper | Incumbent | | Yes | Yes |
| Elizabeth Hubley | Liberal (Senate caucus) | Prince Edward Island | March 8, 2001 | Chrétien | September 8, 2017 | Retirement | Yes | No |
| Mobina Jaffer | Liberal (Senate caucus) | British Columbia | June 13, 2001 | Chrétien | Incumbent | | Yes | Yes |
| Mobina Jaffer | Non-affiliated | British Columbia | June 13, 2001 | Chrétien | Incumbent | | Yes | Yes |
| Mobina Jaffer | Independent Senators Group | British Columbia | June 13, 2001 | Chrétien | Incumbent | | Yes | Yes |
| Janis Johnson | Conservative | Manitoba (Winnipeg - Interlake) | September 27, 1990 | Mulroney | September 27, 2016 | Resignation | Yes | No |
| Serge Joyal | Liberal (Senate caucus) | Québec (Kennebec) | November 26, 1997 | Chrétien | Incumbent | | Yes | Yes |
| Colin Kenny | Liberal (Senate caucus) | Ontario (Rideau) | June 29, 1984 | Trudeau, P. E. | February 2, 2018 | Resignation | Yes | No |
| Marty Klyne | Non-affiliated | Saskatchewan | September 24, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Marty Klyne | Independent Senators Group | Saskatchewan | September 24, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Stan Kutcher | Non-affiliated | Nova Scotia | December 12, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Stan Kutcher | Independent Senators Group | Nova Scotia | December 12, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Patti LaBoucane-Benson | Non-affiliated | Alberta | October 3, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Patti LaBoucane-Benson | Independent Senators Group | Alberta | October 3, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Daniel Lang | Conservative | Yukon (Whitehorse) | January 2, 2009 | Harper | August 15, 2017 | Resignation | Yes | No |
| Frances Lankin | Non-affiliated | Ontario | April 1, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Frances Lankin | Independent Senators Group | Ontario | April 1, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Tony Loffreda | Non-affiliated | Quebec (Shawinigan) | July 23, 2019 | Trudeau, J. | Incumbent | | No | Yes |
| Sandra Lovelace Nicholas | Liberal (Senate caucus) | New Brunswick | September 21, 2005 | Martin | Incumbent | | Yes | Yes |
| Michael L. MacDonald | Conservative | Nova Scotia (Dartmouth) | January 2, 2009 | Harper | Incumbent | | Yes | Yes |
| Ghislain Maltais | Conservative | Quebec (Shawinigan) | January 6, 2012 | Harper | April 22, 2019 | Retirement | Yes | No |
| Fabian Manning | Conservative | Newfoundland and Labrador | May 25, 2011 | Harper | Incumbent | | Yes | Yes |
| Elizabeth Marshall | Conservative | Newfoundland and Labrador | January 29, 2010 | Harper | Incumbent | | Yes | Yes |
| Yonah Martin | Conservative | British Columbia (Vancouver) | January 2, 2009 | Harper | Incumbent | | Yes | Yes |
| Sabi Marwah | Non-affiliated | Ontario | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Sabi Marwah | Independent Senators Group | Ontario | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Paul J. Massicotte | Liberal (Senate caucus) | Quebec (De Lanaudière) | June 26, 2003 | Chrétien | Incumbent | | Yes | Yes |
| Paul J. Massicotte | Independent Senators Group | Quebec (De Lanaudière) | June 26, 2003 | Chrétien | Incumbent | | Yes | Yes |
| Mary Jane McCallum | Non-affiliated | Manitoba | December 4, 2017 | Trudeau, J. | Incumbent | | No | Yes |
| Mary Jane McCallum | Independent Senators Group | Manitoba | December 4, 2017 | Trudeau, J. | Incumbent | | No | Yes |
| Elaine McCoy | Independent Progressive Conservative | Alberta (Calgary) | March 24, 2005 | Martin | Incumbent | | Yes | Yes |
| Elaine McCoy | Non-affiliated | Alberta (Calgary) | March 24, 2005 | Martin | Incumbent | | Yes | Yes |
| Elaine McCoy | Independent Senators Group | Alberta (Calgary) | March 24, 2005 | Martin | Incumbent | | Yes | Yes |
| Tom McInnis | Conservative | Nova Scotia | September 6, 2012 | Harper | Incumbent | | Yes | Yes |
| Paul McIntyre | Conservative | New Brunswick | September 6, 2012 | Harper | Incumbent | | Yes | Yes |
| Marilou McPhedran | Non-affiliated | Manitoba | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Marilou McPhedran | Independent Senators Group | Manitoba | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Marie-Françoise Mégie | Non-affiliated | Quebec (Rougemont) | November 25, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Marie-Françoise Mégie | Independent Senators Group | Quebec (Rougemont) | November 25, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Terry Mercer | Liberal (Senate caucus) | Nova Scotia (Northend Halifax) | November 7, 2003 | Chrétien | Incumbent | | Yes | Yes |
| Pana Merchant | Liberal (Senate caucus) | Saskatchewan | December 12, 2002 | Chrétien | March 31, 2017 | Resignation | Yes | No |
| Don Meredith | Non-affiliated | Ontario | December 20, 2010 | Harper | May 10, 2017 | Resignation | Yes | No |
| Don Meredith | Independent Senators Group | Ontario | December 20, 2010 | Harper | May 10, 2017 | Resignation | Yes | No |
| Don Meredith | Non-affiliated | Ontario | December 20, 2010 | Harper | May 10, 2017 | Resignation | Yes | No |
| Grant Mitchell | Liberal (Senate caucus) | Alberta (Edmonton) | March 24, 2005 | Martin | Incumbent | | Yes | Yes |
| Grant Mitchell | Non-affiliated | Alberta (Edmonton) | March 24, 2005 | Martin | Incumbent | | Yes | Yes |
| Julie Miville-Dechêne | Non-affiliated | Quebec (Inkerman) | June 20, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Julie Miville-Dechêne | Independent Senators Group | Quebec (Inkerman) | June 20, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Percy Mockler | Conservative | New Brunswick (St. Leonard) | January 2, 2009 | Harper | Incumbent | | Yes | Yes |
| Lucie Moncion | Non-affiliated | Ontario | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Lucie Moncion | Independent Senators Group | Ontario | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Rosemary Moodie | Non-affiliated | Ontario | December 12, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Rosemary Moodie | Independent Senators Group | Ontario | December 12, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Wilfred P. Moore | Liberal (Senate caucus) | Nova Scotia (Stanhope St./Bluenose) | September 26, 1996 | Chrétien | January 14, 2017 | Retirement | Yes | No |
| Jim Munson | Liberal (Senate caucus) | Ontario (Ottawa/Rideau Canal) | December 10, 2003 | Chrétien | Incumbent | | Yes | Yes |
| Richard Neufeld | Conservative | British Columbia (Charlie Lake) | January 2, 2009 | Harper | Incumbent | | Yes | Yes |
| Thanh Hai Ngo | Conservative | Ontario | September 6, 2012 | Harper | Incumbent | | Yes | Yes |
| Kelvin Ogilvie | Conservative | Nova Scotia (Annapolis Valley - Hants) | August 27, 2009 | Harper | November 6, 2017 | Retirement | Yes | No |
| Victor Oh | Conservative | Ontario | January 25, 2013 | Harper | Incumbent | | Yes | Yes |
| Ratna Omidvar | Non-affiliated | Ontario | April 1, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Ratna Omidvar | Independent Senators Group | Ontario | April 1, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Kim Pate | Non-affiliated | Ontario | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Kim Pate | Independent Senators Group | Ontario | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Dennis Patterson | Conservative | Nunavut | August 27, 2009 | Harper | Incumbent | | Yes | Yes |
| Chantal Petitclerc | Non-affiliated | Quebec (Grandville) | April 1, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Chantal Petitclerc | Independent Senators Group | Quebec (Grandville) | April 1, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Don Plett | Conservative | Manitoba (Landmark) | August 27, 2009 | Harper | Incumbent | | Yes | Yes |
| Rose-May Poirier | Conservative | New Brunswick (Saint-Louis-de-Kent) | February 28, 2010 | Harper | Incumbent | | Yes | Yes |
| André Pratte | Non-affiliated | Quebec (De Salaberry) | April 1, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| André Pratte | Independent Senators Group | Quebec (De Salaberry) | April 1, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Nancy Greene Raine | Conservative | British Columbia (Sun Peaks) | January 2, 2009 | Harper | May 11, 2018 | Retirement | Yes | No |
| Mohamed-Iqbal Ravalia | Non-affiliated | Newfoundland and Labrador | June 1, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Mohamed-Iqbal Ravalia | Independent Senators Group | Newfoundland and Labrador | June 1, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| David Adams Richards | Non-affiliated | New Brunswick | September 20, 2017 | Trudeau, J. | Incumbent | | No | Yes |
| David Adams Richards | Independent Senators Group | New Brunswick | September 20, 2017 | Trudeau, J. | Incumbent | | No | Yes |
| David Adams Richards | Non-affiliated | New Brunswick | September 20, 2017 | Trudeau, J. | Incumbent | | No | Yes |
| Pierrette Ringuette | Liberal (Senate caucus) | New Brunswick | December 12, 2002 | Chrétien | Incumbent | | Yes | Yes |
| Pierrette Ringuette | Non-affiliated | New Brunswick | December 12, 2002 | Chrétien | Incumbent | | Yes | Yes |
| Pierrette Ringuette | Independent Senators Group | New Brunswick | December 12, 2002 | Chrétien | Incumbent | | Yes | Yes |
| Michel Rivard | Conservative | Quebec (The Laurentides) | January 2, 2009 | Harper | August 7, 2016 | Retirement | Yes | No |
| Michel Rivard | Non-affiliated | Quebec (The Laurentides) | January 2, 2009 | Harper | August 7, 2016 | Retirement | Yes | No |
| Bob Runciman | Conservative | Ontario | January 29, 2010 | Harper | August 10, 2017 | Retirement | Yes | No |
| Nancy Ruth | Conservative | Ontario (Toronto) | March 24, 2005 | Martin | January 6, 2017 | Retirement | Yes | No |
| Raymonde Saint Germain | Non-affiliated | Quebec (De la Vallière) | November 25, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Raymonde Saint Germain | Independent Senators Group | Quebec (De la Vallière) | November 25, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Judith Seidman | Conservative | Québec (De la Durantaye) | August 27, 2009 | Harper | Incumbent | | Yes | Yes |
| Nick Sibbeston | Liberal (Senate caucus) | Northwest Territories | September 2, 1999 | Chrétien | November 21, 2017 | Resignation | Yes | No |
| Nick Sibbeston | Non-affiliated | Northwest Territories | September 2, 1999 | Chrétien | November 21, 2017 | Resignation | Yes | No |
| Paula Simons | Non-affiliated | Alberta | October 3, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Paula Simons | Independent Senators Group | Alberta | October 3, 2018 | Trudeau, J. | Incumbent | | No | Yes |
| Murray Sinclair | Non-affiliated | Manitoba | April 2, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Murray Sinclair | Independent Senators Group | Manitoba | April 2, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| David P. Smith | Liberal (Senate caucus) | Ontario (Cobourg) | June 25, 2002 | Chrétien | May 16, 2016 | Retirement | Yes | No |
| Larry Smith | Conservative | Quebec (Saurel) | May 25, 2011 | Harper | Incumbent | | Yes | Yes |
| Carolyn Stewart Olsen | Conservative | New Brunswick | August 27, 2009 | Harper | Incumbent | | Yes | Yes |
| Scott Tannas | Conservative | Alberta | March 25, 2013 | Harper | Incumbent | | Yes | Yes |
| Claudette Tardif | Liberal (Senate caucus) | Alberta (Edmonton) | March 24, 2005 | Martin | February 2, 2018 | Resignation | Yes | No |
| David Tkachuk | Conservative | Saskatchewan | June 8, 1993 | Mulroney | Incumbent | | Yes | Yes |
| Betty Unger | Conservative | Alberta | January 6, 2012 | Harper | August 21, 2018 | Retirement | Yes | No |
| Josée Verner | Conservative | Quebec (Montarville) | June 13, 2011 | Harper | Incumbent | | Yes | Yes |
| Josée Verner | Non-affiliated | Quebec (Montarville) | June 13, 2011 | Harper | Incumbent | | Yes | Yes |
| Josée Verner | Independent Senators Group | Quebec (Montarville) | June 13, 2011 | Harper | Incumbent | | Yes | Yes |
| John D. Wallace | Non-affiliated | New Brunswick (Rothesay) | January 2, 2009 | Harper | February 1, 2017 | Resignation | Yes | No |
| Pamela Wallin | Non-affiliated | Saskatchewan (Kuroki Beach) | January 2, 2009 | Harper | Incumbent | | Yes | Yes |
| Pamela Wallin | Independent Senators Group | Saskatchewan (Kuroki Beach) | January 2, 2009 | Harper | Incumbent | | Yes | Yes |
| Charlie Watt | Liberal (Senate caucus) | Quebec (Inkerman) | January 16, 1984 | Trudeau, P. E. | March 16, 2018 | Resignation | Yes | No |
| David Wells | Conservative | Newfoundland and Labrador | January 25, 2013 | Harper | Incumbent | | Yes | Yes |
| Howard Wetston | Non-affiliated | Ontario | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Howard Wetston | Independent Senators Group | Ontario | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Vernon White | Conservative | Ontario | February 20, 2012 | Harper | Incumbent | | Yes | Yes |
| Yuen Pau Woo | Non-affiliated | British Columbia | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |
| Yuen Pau Woo | Independent Senators Group | British Columbia | November 10, 2016 | Trudeau, J. | Incumbent | | No | Yes |

^ The province of Quebec has 24 Senate divisions which are constitutionally mandated. In all other provinces, a Senate division is strictly an optional designation of the senator's own choosing, and has no real constitutional or legal standing. A senator who does not choose a special senate division is designated a senator for the province at large.

## Membership changes

| Date | Name | Province | Affiliation before | Affiliation after | Reason |
| - | - | - | - | - | - |
| November 19, 2015 | John Wallace | New Brunswick | Conservative | Non-affiliated | Resigned from Conservative caucus |
| December 3, 2015 | Jacques Demers | Quebec | Conservative | Non-affiliated | Resigned from Conservative caucus |
| December 7, 2015 | George Furey | Newfoundland and Labrador | Senate Liberal | Non-affiliated | Resigned from Senate Liberal caucus |
| February 2, 2016 | Pierrette Ringuette | New Brunswick | Senate Liberal | Non-affiliated | Resigned from Senate Liberal caucus |
| February 10, 2016 | Irving Gerstein | Ontario | Conservative | vacant | Mandatory retirement |
| February 17, 2016 | Elaine McCoy | Alberta | Ind. Progressive Conservative | Non-affiliated | Redesignated from Independent Progressive Conservative |
| March 1, 2016 | Maria Chaput | Manitoba | Senate Liberal | vacant | Resigned from Senate |
| March 7, 2016 | Michel Rivard | Quebec | Conservative | Non-affiliated | Resigned from Conservative caucus |
| March 8, 2016 | Diane Bellemare | Quebec | Conservative | Non-affiliated | Resigned from Conservative caucus |
| March 23, 2016 | Peter Harder | Ontario | vacant | Non-affiliated | Appointed to Senate |
| April 1, 2016 | Raymonde Gagné | Manitoba | vacant | Non-affiliated | Appointed to Senate |
| April 1, 2016 | Frances Lankin | Ontario | vacant | Non-affiliated | Appointed to Senate |
| April 1, 2016 | Ratna Omidvar | Ontario | vacant | Non-affiliated | Appointed to Senate |
| April 1, 2016 | Chantal Petitclerc | Quebec | vacant | Non-affiliated | Appointed to Senate |
| April 1, 2016 | André Pratte | Quebec | vacant | Non-affiliated | Appointed to Senate |
| April 2, 2016 | Murray Sinclair | Manitoba | vacant | Non-affiliated | Appointed to Senate |
| April 6, 2016 | Larry Campbell | British Columbia | Senate Liberal | Non-affiliated | Resigned from Senate Liberal caucus |
| April 22, 2016 | Céline Hervieux-Payette | Quebec | Senate Liberal | vacant | Mandatory retirement |
| May 2, 2016 | Grant Mitchell | Alberta | Senate Liberal | Non-affiliated | Resigned from Senate Liberal caucus |
| May 5, 2016 | Nick Sibbeston | Northwest Territories | Senate Liberal | Non-affiliated | Resigned from Senate Liberal caucus |
| May 16, 2016 | David Smith | Ontario | Senate Liberal | vacant | Mandatory retirement |
| July 14, 2016 | Doug Black | Alberta | Conservative | Non-affiliated | Resigned from Conservative caucus |
| August 7, 2016 | Michel Rivard | Quebec | Non-affiliated | vacant | Mandatory retirement |
| September 27, 2016 | Janis Johnson | Manitoba | Conservative | vacant | Resigned from Senate |
| November 10, 2016 | Nancy Hartling | New Brunswick | vacant | Non-affiliated | Appointed to Senate |
| November 10, 2016 | Wanda Thomas Bernard | Nova Scotia | vacant | Non-affiliated | Appointed to Senate |
| November 10, 2016 | Gwen Boniface | Ontario | vacant | Non-affiliated | Appointed to Senate |
| November 10, 2016 | Tony Dean | Ontario | vacant | Non-affiliated | Appointed to Senate |
| November 10, 2016 | Sabi Marwah | Ontario | vacant | Non-affiliated | Appointed to Senate |
| November 10, 2016 | Lucie Moncion | Ontario | vacant | Non-affiliated | Appointed to Senate |
| November 10, 2016 | Kim Pate | Ontario | vacant | Non-affiliated | Appointed to Senate |
| November 10, 2016 | Howard Wetston | Ontario | vacant | Non-affiliated | Appointed to Senate |
| November 10, 2016 | Patricia Bovey | Manitoba | vacant | Non-affiliated | Appointed to Senate |
| November 10, 2016 | René Cormier | Manitoba | vacant | Non-affiliated | Appointed to Senate |
| November 10, 2016 | Marilou McPhedran | Manitoba | vacant | Non-affiliated | Appointed to Senate |
| November 10, 2016 | Renée Dupuis | Quebec | vacant | Non-affiliated | Appointed to Senate |
| November 10, 2016 | Diane Griffin | Prince Edward Island | vacant | Non-affiliated | Appointed to Senate |
| November 10, 2016 | Yuen Pau Woo | British Columbia | vacant | Non-affiliated | Appointed to Senate |
| November 21, 2016 | Éric Forest | Quebec | vacant | Non-affiliated | Appointed to Senate |
| November 22, 2016 | Pierre-Hugues Boisvenu | Quebec | Non-affiliated | Conservative | Rejoined Conservative caucus |
| November 25, 2016 | Marc Gold | Quebec | vacant | Non-affiliated | Appointed to Senate |
| November 25, 2016 | Marie-Françoise Mégie | Quebec | vacant | Non-affiliated | Appointed to Senate |
| November 25, 2016 | Raymonde Saint Germain | Quebec | vacant | Non-affiliated | Appointed to Senate |
| December 2, 2016 | 33 Non-affiliated senators | Various | Non-affiliated | ISG | Formation of Independent Senators Group |
| December 6, 2016 | Daniel Christmas | Nova Scotia | vacant | Non-affiliated | Appointed to Senate |
| December 6, 2016 | Rosa Galvez | Quebec | vacant | Non-affiliated | Appointed to Senate |
| December 16, 2016 | Daniel Christmas | Nova Scotia | Non-affiliated | ISG | Redesignated from non-affiliated |
| December 16, 2016 | Rosa Galvez | Quebec | Non-affiliated | ISG | Redesignated from non-affiliated |
| January 6, 2017 | Nancy Ruth | Ontario | Conservative | vacant | Mandatory retirement |
| January 14, 2017 | Wilfred P. Moore | Nova Scotia | Senate Liberal | vacant | Mandatory retirement |
| January 22, 2017 | Jim Cowan | Nova Scotia | Senate Liberal | vacant | Mandatory retirement |
| January 31, 2017 | Josée Verner | Quebec | Conservative | Non-affiliated | Resigned from Conservative caucus |
| February 1, 2017 | John D. Wallace | New Brunswick | Non-affiliated | vacant | Resigned from Senate |
| March 10, 2017 | Don Meredith | Ontario | ISG | Non-affiliated | Resigned from Independent Senators Group |
| March 10, 2017 | Anne Cools | Ontario | Non-affiliated | ISG | Redesignated from non-affiliated |
| March 30, 2017 | Wanda Bernard | Nova Scotia | Non-affiliated | ISG | Redesignated from non-affiliated |
| March 31, 2017 | Pana Merchant | Saskatchewan | Senate Liberal | vacant | Resigned from Senate |
| May 10, 2017 | Don Meredith | Ontario | Non-affiliated | vacant | Resigned from Senate |
| May 16, 2017 | Stephen Greene | Nova Scotia | Conservative | Non-affiliated | Removed from Conservative caucus |
| August 10, 2017 | Bob Runciman | Ontario | Conservative | vacant | Mandatory retirement |
| August 15, 2017 | Daniel Lang | Yukon | Conservative | vacant | Resigned from Senate |
| August 30, 2017 | David Adams Richards | New Brunswick | vacant | Non-affiliated | Appointed to Senate |
| September 4, 2017 | George Baker | Newfoundland and Labrador | Senate Liberal | vacant | Mandatory retirement |
| September 8, 2017 | Elizabeth Hubley | Prince Edward Island | Senate Liberal | vacant | Mandatory retirement |
| September 28, 2017 | David Adams Richards | New Brunswick | Non-affiliated | ISG | Redesignated from non-affiliated |
| October 17, 2017 | Josée Verner | Quebec | Non-affiliated | ISG | Redesignated from non-affiliated |
| October 24, 2017 | Stephen Greene | Nova Scotia | Non-affiliated | ISG | Redesignated from non-affiliated |
| October 30, 2017 | Paul Massicotte | Quebec | Non-affiliated | ISG | Redesignated from non-affiliated |
| November 6, 2017 | Kelvin Ogilvie | Nova Scotia | Conservative | vacant | Mandatory retirement |
| November 16, 2017 | Tobias Enverga | Ontario | Conservative | vacant | Death |
| November 21, 2017 | Nick Sibbeston | Northwest Territories | Non-affiliated | vacant | Resigned from Senate |
| December 4, 2017 | Mary Coyle | Nova Scotia | vacant | Non-affiliated | Appointed to Senate |
| December 4, 2017 | Mary Jane McCallum | Manitoba | vacant | Non-affiliated | Appointed to Senate |
| January 4, 2018 | Lynn Beyak | Ontario | Conservative | Non-affiliated | Removed from Conservative caucus |
| February 2, 2018 | Joan Fraser | Quebec | Senate Liberal | vacant | Resigned from Senate |
| February 2, 2018 | Colin Kenny | Ontario | Senate Liberal | vacant | Resigned from Senate |
| February 2, 2018 | Claudette Tardif | Alberta | Senate Liberal | vacant | Resigned from Senate |
| February 7, 2018 | Mary Coyle | Nova Scotia | Non-affiliated | ISG | Redesignated from non-affiliated |
| February 7, 2018 | Mary Jane McCallum | Manitoba | Non-affiliated | ISG | Redesignated from non-affiliated |
| February 15, 2018 | Robert Black | Ontario | vacant | Non-affiliated | Appointed to Senate |
| February 15, 2018 | Marty Deacon | Ontario | vacant | Non-affiliated | Appointed to Senate |
| February 28, 2018 | Robert Black | Ontario | Non-affiliated | ISG | Redesignated from non-affiliated |
| February 28, 2018 | Marty Deacon | Ontario | Non-affiliated | ISG | Redesignated from non-affiliated |
| March 15, 2018 | Yvonne Boyer | Ontario | vacant | Non-affiliated | Appointed to Senate |
| March 16, 2018 | Charlie Watt | Quebec | Senate Liberal | vacant | Resigned from Senate |
| March 28, 2018 | Yvonne Boyer | Ontario | Non-affiliated | ISG | Redesignated from non-affiliated |
| April 24, 2018 | David Adams Richards | New Brunswick | ISG | Non-affiliated | Redesignated from Independent Senators Group |
| May 11, 2018 | Nancy Greene Raine | British Columbia | Conservative | vacant | Mandatory retirement |
| June 1, 2018 | Mohamed-Iqbal Ravalia | Newfoundland and Labrador | vacant | Non-affiliated | Appointed to Senate |
| June 6, 2018 | Pierre Dalphond | Quebec | vacant | Non-affiliated | Appointed to Senate |
| June 6, 2018 | Donna Dasko | Ontario | vacant | Non-affiliated | Appointed to Senate |
| June 7, 2018 | Mohamed-Iqbal Ravalia | Newfoundland and Labrador | Non-affiliated | ISG | Redesignated from non-affiliated |
| June 8, 2018 | Pierre Dalphond | Quebec | Non-affiliated | ISG | Redesignated from non-affiliated |
| June 8, 2018 | Donna Dasko | Ontario | Non-affiliated | ISG | Redesignated from non-affiliated |
| June 8, 2018 | David Adams Richards | New Brunswick | Non-affiliated | ISG | Redesignated from non-affiliated |
| June 15, 2018 | Colin Deacon | Nova Scotia | vacant | Non-affiliated | Appointed to Senate |
| June 20, 2018 | Julie Miville-Dechêne | Quebec | vacant | Non-affiliated | Appointed to Senate |
| August 12, 2018 | Anne Cools | Ontario | ISG | vacant | Mandatory retirement |
| August 21, 2018 | Betty Unger | Alberta | Conservative | vacant | Mandatory retirement |
| September 19, 2018 | Julie Miville-Dechêne | Quebec | Non-affiliated | ISG | Redesignated from non-affiliated |
| September 21, 2018 | Colin Deacon | Nova Scotia | Non-affiliated | ISG | Redesignated from non-affiliated |
| September 24, 2018 | Bev Busson | British Columbia | vacant | Non-affiliated | Appointed to Senate |
| September 24, 2018 | Marty Klyne | Saskatchewan | vacant | Non-affiliated | Appointed to Senate |
| September 29, 2018 | Art Eggleton | Ontario | Senate Liberal | vacant | Mandatory retirement |
| October 3, 2018 | Peter Boehm | Ontario | vacant | Non-affiliated | Appointed to Senate |
| October 3, 2018 | Patti LaBoucane-Benson | Alberta | vacant | Non-affiliated | Appointed to Senate |
| October 3, 2018 | Paula Simons | Alberta | vacant | Non-affiliated | Appointed to Senate |
| October 11, 2018 | Josée Forest-Niesing | Ontario | vacant | Non-affiliated | Appointed to Senate |
| October 11, 2018 | Brian Francis | Prince Edward Island | vacant | Non-affiliated | Appointed to Senate |
| October 17, 2018 | Bev Busson | British Columbia | Non-affiliated | ISG | Redesignated from non-affiliated |
| October 17, 2018 | Josée Forest-Niesing | Ontario | Non-affiliated | ISG | Redesignated from non-affiliated |
| October 17, 2018 | Brian Francis | Prince Edward Island | Non-affiliated | ISG | Redesignated from non-affiliated |
| October 18, 2018 | Peter Boehm | Ontario | Non-affiliated | ISG | Redesignated from non-affiliated |
| October 18, 2018 | Paula Simons | Alberta | Non-affiliated | ISG | Redesignated from non-affiliated |
| October 30, 2018 | Patti LaBoucane-Benson | Alberta | Non-affiliated | ISG | Redesignated from non-affiliated |
| October 31, 2018 | Marty Klyne | Saskatchewan | Non-affiliated | ISG | Redesignated from non-affiliated |
| December 12, 2018 | Margaret Dawn Anderson | Northwest Territories | vacant | Non-affiliated | Appointed to Senate |
| December 12, 2018 | Pat Duncan | Yukon | vacant | Non-affiliated | Appointed to Senate |
| December 12, 2018 | Stan Kutcher | Nova Scotia | vacant | Non-affiliated | Appointed to Senate |
| December 12, 2018 | Rosemary Moodie | Ontario | vacant | Non-affiliated | Appointed to Senate |
| December 19, 2018 | Mobina Jaffer | British Columbia | Senate Liberal | Non-affiliated | Resigned from Senate Liberal caucus |
| February 21, 2019 | Margaret Dawn Anderson | Northwest Territories | Non-affiliated | ISG | Redesignated from non-affiliated |
| February 21, 2019 | Pat Duncan | Yukon | Non-affiliated | ISG | Redesignated from non-affiliated |
| February 21, 2019 | Stan Kutcher | Nova Scotia | Non-affiliated | ISG | Redesignated from non-affiliated |
| February 21, 2019 | Rosemary Moodie | Ontario | Non-affiliated | ISG | Redesignated from non-affiliated |
| April 22, 2019 | Ghislain Maltais | Quebec | Conservative | vacant | Mandatory retirement |
| June 12, 2019 | Mobina Jaffer | British Columbia | Non-affiliated | ISG | Redesignated from non-affiliated |
| July 23, 2019 | Tony Loffreda | Quebec | vacant | Non-affiliated | Appointed to Senate |
| August 14, 2019 | Raynell Andreychuk | Saskatchewan | Conservative | vacant | Mandatory retirement |
| August 25, 2019 | Jacques Demers | Quebec | ISG | vacant | Mandatory retirement |

The party standings in the Senate have changed during the 42nd Canadian Parliament as follows:

| Number of members per group by date | Number of members per group by date | 2015 | 2015 | 2015 | 2015 | 2016 | 2016 | 2016 | 2016 | 2016 | 2016 | 2016 | 2016 | 2016 | 2016 | 2016 | 2016 | 2016 | 2016 | 2016 | 2016 | 2016 | 2016 | 2016 |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Number of members per group by date | Number of members per group by date | Oct 19 | Nov 19 | Dec 3 | Dec 7 | Feb 2 | Feb 10 | Feb 17 | Mar 1 | Mar 7 | Mar 8 | Mar 23 | Apr 1 | Apr 2 | Apr 6 | Apr 22 | May 2 | May 5 | May 16 | Jul 14 | Aug 7 | Sep 27 | Nov 10 | Nov 21 |
| | Conservative | 47 | 46 | 45 | 45 | 45 | 44 | 44 | 44 | 43 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 41 | 41 | 40 | 40 | 40 |
| | Senate Liberal Caucus | 29 | 29 | 29 | 28 | 27 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 24 | 23 | 22 | 21 | 21 | 21 | 21 | 21 | 21 |
| | Non-affiliated | 6 | 7 | 8 | 9 | 10 | 10 | 11 | 11 | 12 | 13 | 14 | 19 | 20 | 21 | 21 | 22 | 23 | 23 | 24 | 23 | 23 | 37 | 38 |
| | Independent PC | 1 | 1 | 1 | 1 | 1 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| | Total members | 83 | 83 | 83 | 83 | 83 | 82 | 82 | 81 | 81 | 81 | 82 | 87 | 88 | 88 | 87 | 87 | 87 | 86 | 86 | 85 | 84 | 98 | 99 |
| | Vacant | 22 | 22 | 22 | 22 | 22 | 23 | 23 | 24 | 24 | 24 | 23 | 18 | 17 | 17 | 18 | 18 | 18 | 19 | 19 | 20 | 21 | 7 | 6 |
| Number of members per group by date | Number of members per group by date | 2016 | 2016 | 2016 | 2016 | 2016 | 2017 | 2017 | 2017 | 2017 | 2017 | 2017 | 2017 | 2017 | 2017 | 2017 | 2017 | 2017 | 2017 | 2017 | 2017 | 2017 | 2017 | 2017 |
| Number of members per group by date | Number of members per group by date | Nov 22 | Nov 25 | Dec 2 | Dec 6 | Dec 16 | Jan 6 | Jan 14 | Jan 22 | Jan 31 | Feb 1 | Mar 30 | Mar 31 | May 10 | May 16 | Aug 10 | Aug 15 | Aug 30 | Sep 4 | Sep 8 | Sep 28 | Oct 17 | Oct 24 | Oct 30 |
| | Conservative | 41 | 41 | 41 | 41 | 41 | 40 | 40 | 40 | 39 | 39 | 39 | 39 | 39 | 38 | 37 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 |
| | Non-affiliated | 37 | 40 | 7 | 9 | 7 | 7 | 7 | 7 | 8 | 8 | 7 | 7 | 6 | 7 | 7 | 7 | 8 | 8 | 8 | 7 | 6 | 5 | 5 | 5 |
| | Senate Liberal Caucus | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 19 | 19 | 19 | 19 | 18 | 18 | 18 | 18 | 18 | 18 | 17 | 16 | 16 | 16 | 16 | 15 | 15 | 15 |
| | Independent Senators Group | - | - | 33 | 33 | 35 | 35 | 35 | 35 | 35 | 34 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 35 | 36 | 37 | 38 | 39 |
| | Total members | 99 | 102 | 102 | 104 | 104 | 103 | 102 | 101 | 101 | 100 | 100 | 99 | 98 | 98 | 97 | 96 | 97 | 96 | 95 | 95 | 95 | 95 | 95 |
| | Vacant | 6 | 3 | 3 | 1 | 1 | 2 | 3 | 4 | 4 | 5 | 5 | 6 | 7 | 7 | 8 | 9 | 8 | 9 | 10 | 10 | 10 | 10 | 10 |
| Number of members per group by date | Number of members per group by date | 2017 | 2017 | 2017 | 2017 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 |
| Number of members per group by date | Number of members per group by date | Nov 6 | Nov 16 | Nov 21 | Dec 4 | Jan 4 | Feb 2 | Feb 7 | Feb 15 | Feb 28 | Mar 15 | Mar 16 | Mar 28 | Apr 24 | May 11 | Jun 1 | Jun 6 | Jun 7 | Jun 8 | Jun 15 | Jun 20 | Aug 12 | Aug 20 | Sep 19 |
| | Independent Senators Group | 39 | 39 | 39 | 39 | 39 | 39 | 41 | 41 | 43 | 43 | 43 | 44 | 43 | 43 | 43 | 43 | 44 | 46 | 46 | 46 | 45 | 45 | 46 |
| | Conservative | 35 | 34 | 34 | 34 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 32 | 31 | 31 |
| | Senate Liberal Caucus | 15 | 15 | 15 | 15 | 15 | 12 | 12 | 12 | 12 | 12 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 | 11 |
| | Non-affiliated | 5 | 5 | 4 | 6 | 7 | 7 | 5 | 7 | 5 | 6 | 6 | 5 | 6 | 6 | 7 | 9 | 8 | 6 | 7 | 8 | 8 | 8 | 7 |
| | Total members | 94 | 93 | 92 | 94 | 94 | 91 | 91 | 93 | 93 | 94 | 93 | 93 | 93 | 92 | 93 | 95 | 95 | 95 | 96 | 97 | 96 | 95 | 95 |
| | Vacant | 11 | 12 | 13 | 11 | 11 | 14 | 14 | 12 | 12 | 11 | 12 | 12 | 12 | 13 | 12 | 10 | 10 | 10 | 9 | 8 | 9 | 10 | 10 |
| Number of members per group by date | Number of members per group by date | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2018 | 2019 | 2019 | 2019 | 2019 | 2019 | 2019 |
| Number of members per group by date | Number of members per group by date | Sep 21 | Sep 24 | Sep 29 | Oct 3 | Oct 11 | Oct 17 | Oct 18 | Oct 30 | Oct 31 | Dec 12 | Dec 19 | Feb 21 | Apr 22 | Jun 12 | Jul 23 | Aug 14 | Aug 25 |
| | Independent Senators Group | 47 | 47 | 47 | 47 | 47 | 50 | 52 | 53 | 54 | 54 | 54 | 58 | 58 | 59 | 59 | 59 | 58 |
| | Conservative | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 30 | 30 | 30 | 29 | 29 |
| | Senate Liberal Caucus | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| | Non-affiliated | 6 | 8 | 8 | 11 | 13 | 10 | 8 | 7 | 6 | 10 | 11 | 7 | 7 | 6 | 7 | 7 | 7 |
| | Total members | 95 | 97 | 96 | 99 | 101 | 101 | 101 | 101 | 101 | 105 | 105 | 105 | 104 | 104 | 105 | 104 | 103 |
| | Vacant | 10 | 8 | 9 | 6 | 4 | 4 | 4 | 4 | 4 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 2 |
