Saint-Charles-sur-Richelieu is a municipality in southwestern Quebec, Canada, on the Richelieu River in the Regional County Municipality of La Vallée-du-Richelieu. The population as of the Canada 2011 Census was 1,643. Demographics Population Population trend: Language Mother tongue language (2006) Communities Kierkoski Saint-Charles-sur-Richelieu See also List of municipalities in Quebec References Municipalities in Quebec Incorporated places in La Vallée-du-Richelieu Regional County Municipality Designated places in Quebec