The department was created in 1968 during a reorganization of the former Seine and Seine-et-Oise departments.
Senators for Val-d'Oise under the French Fifth Republic were:{{sfn|Liste des anciens sénateurs de la Vème République}}
| Period | Name | Party | Notes | | 1968-1977 | Fernand Chatelain | French Communist Party (PCF) |
| Adolphe Chauvin | Union of Democrats for the Republic (UDR) |
| André Messager | Union of Democrats for the Republic (UDR) |
| 1977-1986 | Fernand Chatelain | French Communist Party (PCF) | Died 11 June 1979 |
| Marie-Claude Beaudeau | French Communist Party (PCF) | From 1979, replacing Fernand Chatelain |
| Adolphe Chauvin | Union of Democrats for the Republic (UDR) |
| Louis Perrein | Socialist Party (PS) |
| Pierre Salvi | Union of Democrats for the Republic (UDR) |
| 1986-1995 | Marie-Claude Beaudeau | French Communist Party (PCF) |
| Hélène Missoffe | Rally for the Republic (RPR) |
| Louis Perrein | Socialist Party (PS) |
| Pierre Salvi | Union of Democrats for the Republic (UDR) |
| Michel Poniatowski | Union for French Democracy (UDF) | From 1989, replacing Pierre Salvi, died |
| 1995-2004 | Alain Richard | Socialist and Republican group (SOC) | Named to the government in 1997 |
| Bernard Angels | Socialist Party (PS) | From 1997, replacing Alain Richard, named to the government |
| Marie-Claude Beaudeau | French Communist Party (PCF) |
| Nelly Olin | Rally for the Republic (RPR)
Union for a Popular Movement (UMP) | Named to the government in 2004 |
| Gérard Claudel | Union for a Popular Movement (UMP) | From 2004, replacing Nelly Olin, named to the government |
| Jean-Philippe Lachenaud | Union for a Popular Movement (UMP) |
| 2004-2011 | Bernard Angels | Socialist Party (PS) |
| Robert Hue | French Communist Party (PCF) |
| Raymonde Le Texier | Socialist Party (PS) |
| Lucienne Malovry | Union for a Popular Movement (UMP) | From 2004, replacing Nelly Olin, retained in the government |
| Hugues Portelli | Union for a Popular Movement (UMP) |
| 2011-2017 | Francis Delattre | Union for a Popular Movement (UMP) |
| Dominique Gillot | Socialist Party (PS) |
| Robert Hue | Movement of Progressives (MDP) |
| Hugues Portelli | Union for a Popular Movement (UMP) |
| Alain Richard | Socialist Party (PS) |
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