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NANPA: North American Numbering Plan Administration"is the numbering plan for the Public Switched Telephone Network for Canada, the US and its territories, and the Caribbean", and is responsible for such things as area codes. Search for area codes by the three-digit number, by the name of a city or town, or by map of the United States or Canada.
A long, unofficial, but apparently comprehensive list of area codes is
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Area Code Listing, by Number
The following are some online telephone directories:
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NumberWay Phone Books Worldwide
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AnyWho: including White Pages (people),Yellow Pages (businesses), and Reverse Lookup (enter the number and find out who it is).
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Online Phonebooks from Ithaca College Library Ready Reference:
- Verizon SuperPages online phone directory
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Switchboard
Home Page
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WhoWhere?
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Yahoo! People Search
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Canada411 phone directory for Canada
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Infobel World international directory