The November 12th, 1982 Municipal Elections in Montréal is the subject of this geographical analysis which aims to test a number of hypotheses concerning democratic representation, voter participation and the role of geography in electoral strategy. The study describes the particular process used in making the new electoral map and shows that middle-class francophones were, proportionately, the most important voters. During the electoral campaign, the parties used diverse geographical strategies, global or selective, with varying success : in the case of two of the three parties, their headquarters proved to be the centers of diffusion in the voting. Finally, the article offers an interpretation of the influence of the ethno-linguistic factor on the voting results based on a study of the electoral maps.