Carignan is a suburban municipality in southwestern Quebec, Canada, on the Richelieu River in La Vallée-du-Richelieu Regional County Munici…Carignan is a suburban municipality in southwestern Quebec, Canada, on the Richelieu River in La Vallée-du-Richelieu Regional County Municipality, about 27 km from Montreal. The population as of the Canada 2021 Census was 11,740.