Area code lookups help researchers get a good idea of where a person lives. Sometimes you can even find out what part of a city a person lives in by looking up the prefix on their phone number - our favorite tool for prefix lookups is Langenberg. Our favorite tools for international country code lookups are Teleconnekt and Tripod. A great tool for U.S. lookups at a glance during data entry is AegisBooks (a static map showing area codes).
| Langenberg | Great for area code and prefix lookups - our favorite overall tool - excellent. |
| Teleconnekt | Everything you need to work the phones internationally, from international phone directories to country code lookups, dialing instructions for international calls - excellent. |
| EscapeArtist | Good for country code lookups, and country phone directories - good. |
| Tripod | Good for country code lookups, and country phone directories - good. |
| BigFoot | Does a lot of things - the key is the email capabilities - good. |
| MMIWorld | Does a good job of keeping up with and displaying all U.S. area codes in numerical order - very good. |
| SwitchBoard | Outstanding for reverse lookups, area code lookups, prefix lookups - excellent. |
| WorldPages | Literally identical page to SwitchBoard - Do these guys know each other? |
| AegisBooks | A static PDF map of the U.S. and Canada displaying the area codes, good for sessions where you want to look up a lot of area codes at a glance to find out where they are located - good. |
| ProDial | A very powerful resource - this is the actual industry record for area codes, city codes (prefixes), and country codes. It takes time to learn use the site effectively, but is worth the effort - excellent. |
| GetThePhone | Area code lookups, phone number lookups and phone directories for Asia and Oceana - good. |
| City.ru | Area and city code (prefix) lookups in Russia - good. |
| AnyWho | Reverse lookups are good if you have the entire phone number (which is the only way the site will tell you where the area code is located), the international section has a good supply of links to international phone directories - average. |
| DeLorme | Awesome site for area code and prefix lookups - excellent. |