Allareacodes.com provides a list of U.S. area codes by number and by state. The website allows users to view an interactive area code map and perform searches by area code or by state. There are also separate lists for Canadian area codes and international dialing codes.
Areacodelocations.info also provides a numerical listing of U.S. and Canadian area codes and indicates whether a particular area code shares its assigned location with other area codes, along with the time zone for each area code. This site also offers visitors the option of viewing area codes by state and features a search-by-city function.