Timeline
| 1642 | Foundation of Montréal. |
| 1642-1760 | French governors administration. |
| 1760-1796 | British governors administration. |
| 1796-1833 | Justices of the peace administration. |
| 1833 (June 3) | The City of Montréal charter came into effect and first election. |
| 1833 (June 5) | City council chose Jacques Viger as the first mayor of Montréal. |
| 1833 (19 juillet) | The first coat of arms and the motto “Concordia Salus” were adopted by the city council. |
| 1836-1840 | The first charter was not renewed. |
| 1837-1838 | Rebellions in Lower and Upper Canada. |
| 1840 | Second incorporation of Montréal. |
| 1849 | Édouard-Raymond Fabre, patriot and bookseller, sixth mayor. |
| 1852 | Mayor Charles Wilson is chosen by the electors. |
| 1874 | Establishment of aldermen committees who took over the management of municipal departments. |
| 1875 | Doctor William Hales Hingston, 16th mayor of Montréal. |
| 1878 | Inauguration of city hall, designed by architects Henri-Maurice Perrault and Alexander C. Hutchison. |
| 1883 | First annexation to Montréal : the city of Hochelaga. |
| 1885 | Journalist Honoré Beaugrand, 18th mayor of Montréal. |
| 1886 | Annexation of the city of Saint-Jean-Baptiste. |
| 1887 | John Joseph Caldwell Abbott, 19th mayor of Montréal and third prime minister of Canada in 1891 until 1892. |
| 1889 | The right to vote was granted to certain categories of women, namely women of age and widows who were owners and adoption of the secret vote. |
| 1893 | Annexation of the city of Côte Saint-Louis. |
| 1899 | The right to vote was granted to tenants. |
| 1905 | Annexation of the village of Villeray, the city of Saint-Henri and the city of Sainte-Cunégonde. |
| 1908 | Annexation of the city of Notre-Dame-des-Neiges. |
| 1909 | Cannon inquiry on the city administration and establishment of the Board of Commissioners. |
| 1910 | Annexation of the following municipalities : village of Rosemont, village of Ahuntsic, city of Côte-des-Neiges, village of Beaurivage de la Longue-Pointe, city of Bordeaux, city of Saint-Paul, city of Longue-Pointe, ville Émard, village of Tétreaultville de Montréal and city of Notre-Dame de Grâce. |
| 1914 | Médéric Martin, 32th maire de Montréal, from 1914 to 1924 and from 1926 to 1928. |
| 1916 | Annexation of the city of Cartierville and the city of Sault-au-Récollet. |
| 1917 | Inauguration of the Municipal library by Joseph-Jacques-Césaire Joffre, maréchal de France. |
| 1918 | Trusteeship by the Québec government. |
| 1921 | Advent of the executive comittee. |
| 1922 | Fire at city hall. |
| 1926 | Inauguration of the new city hall. |
| 1928 | Camillien Houde, 34th mayor of Montréal, from 1928 to 1930, 1934 to 1936, 1938 to 1940 and from 1944 to 1954. |
| 1930 (années...) | Great Depression. |
| 1931 | Establishment of the Botanical Garden. |
| 1934 | The right to vote was extended to married women owners and married women under the regime of separation as to property. |
| 1938 | Modification of the coat of arms. |
| 1939 | Visit of King George VI and Queen Elizabeth in Montréal. |
| 1940 | Camillien Houde was arrested on August 5 by the RCMP for his opposition to conscription. |
| 1942 | Tercentenary of Montréal. |
| 1944 | Camillien Houde was released from prison camp and was re-elected mayor. He was nicknamed «Monsieur Montréal». |
| 1945 | End of the Second World War. |
| 1949 | The mayor gained the right to sit on the executive committee. |
| 1950-1954 | Board of inquiry presided over by Judge François Caron on police activities. |
| 1951 | Establishment of the Civic Action League. |
| 1954 | Victory of the Civic Action League with the election of Jean Drapeau as mayor. |
| 1957 | Election of Sarto Fournier as mayor of Montréal |
| 1960 | Jean Drapeau withdrew from the Civic Action League, founded the Civic Party of Montréal and was re-elected mayor. |
| 1962 | Abolition of Class A councillors. |
| 1963 | Start of development work on the islands for the 1967 World Exhibition. |
| 1964 | Annexation of the village of Saraguay. |
| 1966 | Inauguration of the metro. |
| 1967 | World Exhibition (expo 67). |
| 1968 | Annexation of the city of Saint-Michel. |
| 1970 | Establishment of the Montréal urban community. |
| 1974 | Establishment of the Montréal Citizens Movement. |
| 1976 | XXI Olympic Games |
| 1978 | Justine Sentenne, first woman to sit on the executive committee. |
| 1980 | Municipal political parties were officially recognized. |
| 1982 | Annexation of the city of Pointe-aux-Trembles. |
| 1986 | The Montréal Citizens Movement won the election and Jean Doré became the 39th mayor of Montréal. |
| 1992 | 350th anniversary of Montréal. |
| 1994 | Vision Montréal won the election and Pierre Bourque became the 40th mayor of Montréal. |
| 1999 | Mayor Pierre Bourque re-launched the «One island, one city» concept. |
| 2001 | The Montreal Island Citizens Union won the election and Gérald Tremblay became the 41th mayor of Montréal. |
| 2002 | New city of Montréal. |
| 2003 | Election of the Liberal Party of Québec and adoption of bill 9 on the consultation of citizens with respect to the territorial reorganization of certain municipalities. |
| 2004 (May 16 to 20) | Tenue de registres sur le territoire de chacune des 28 anciennes municipalités de l’île de Montréal. |
| 2004 (June 20) | Referendum within 22 former municipalities : 15 of them chose to reconstitute. |
| 2005 (November 6) | Gérald Tremblay is re-elected as mayor of Montréal. |
| 2006 (January 1st) | New city of Montréal and establishment of the agglomeration council. |
