An online list of Canadian area codes can be found at AllAreaCodes.com. This site provides a map of Canadian area codes by province as well as a list of area codes by province. It also provides a list of Canadian area codes in numeric order.
Ontario, the most populated Canadian province, has 13 area codes, while the provinces of New Brunswick, Newfoundland, the Northwest Territories, Nova Scotia, Nunavut, and Yukon have only one area code for the entire province. Canadian area codes can also be found on this site by providing the name of the a city and its associated province.