Some online resources offer a search tool that allows you to enter an area code to find its corresponding city or location. Such search tools can be found at AllAreaCodes.com and AreaCodeLocations.info.
It is also possible to do this look-up in reverse; that is, if you know the city or location, you can find the area code from a site such as AllAreaCodes.com. This site in particular also offers a reverse phone number look-up (for a $1.95 fee) to learn the name and address of a caller, as well as maps of the regions covered by area codes in the United States and Canada. In addition, individual state maps are available for every U.S. state.