1874
Incorporated as Village of Notre-Dame-de-Grâce
1874
Mayor: Hon. E. Prud’homme
1875-79
Mayor: Hon. E. Prud’homme
1879
Name changed to Village of Côte Saint-Antoine
1880-83
Mayor: Hon. James K. Ward
1884-86
Mayor: Alexander C. Hutchinson
1890
Name changed to Town of Côte Saint-Antoine
1891-93
Mayor: Matthew Hutchinson
1894
Mayor: James Henry Redfern
1895
Name changed to Town of Westmount
1895
Mayor: James Henry Redfern
1900-02
Mayor: Willam Douw Lighthall
1903-04
Mayor: Alexander S.G. Cross
1908
Name changed to City of Westmount
1909
Mayor: William Henry Trenholme
1911-12
Mayor: William Rutherford
1919-26
Mayor: Peter William McLagan
1975-83
Mayor: Donal C. MacCallum
2002-05
Mayor: (during merger) Karin Marks
2006-09
Mayor: (post-merger) Karin Marks