On February 4, 1960, the mayor of the city of Dollard-des-Ormeaux, Joseph Paiement, and his Council adopted the law incorporating the City.
In the early 1960s, the City has a population of approximately 1,800 people. Since then, it continues to grow exponentially. Under the aegis of mayors Labrosse, Wilson, Dephoure and Cournoyer and with the collaboration of developers such as Belcourt, Roger Pilon and Zunneshine, hundreds of houses are built, dozens of streets are created and many parks are inaugurated. In 1967, the city of Dollard-des-Ormeaux is named Suburb of the Year. That same year, the City Council plans to build a park to commemorate the 100th anniversary of Canada's Confederation. Centennial Park and its basin are opened to the public in 1976.
In the early 1970s, the City Council proposes the construction of a civic centre. It is inaugurated on May 24, 1977 and offers residents a theatre, three indoor skating rinks and an Olympic-sized swimming pool, in addition to housing the administrative offices.
In the early 1980s, the population exceeds 40,000. Consequently, a period of consolidation begins under the leadership of Mayor Janiszewski. The City confirms its community and cultural commitment by building a library, a cultural centre and a community centre. These are opened on January 17, 1992.
During city mergers, between 2002 and 2005, the City is known as the Dollard-des-Ormeaux/Roxboro Borough. It is reconstituted on January 1, 2006, following a referendum, and becomes once again a city in its own right.
Mayor Alex Bottausci takes office on November 12, 2017 and is concerned about citizen services and sustainable development. He inaugurates the new Community Centre, renowned for its energy efficiency, on May 17, 2018.
The City continues its ongoing projects, including the renovation of the Library and the planting of hundreds of trees. In addition, a wide range of future projects are under development.