This is the fourth document is a series of studies on the evolution of Canada's linguistic situation published under the same title following the population censuses of 1991, 1996 and 2001. This document is intended as an essential, unique reference tool for anyone who is interested in the languages and various linguistic groups that make up Canada. It presents the results of the Census on various language variables and analyzes the main factors and trends that influence the evolution of Canada's linguistic composition.--Document.