- Area Code Search Engine
- Free lookup service for any area code within the United States territory.
- DialCodesPlus
- Presents international dialing, country, as well as NDD and IDD calling codes.
- Fone Finder
- Facilitates searches for USA, Canadian, and international telephone numbers.
- International Dialing Codes
- Tabulates country codes, international direct dialing prefixes, and national dialing prefixes for making phone calls.
- Interworldcodes
- Refer to this page for the proper prefixes or area codes necessary for country to country telephoning.
- LincMad
- Personal initiative of listing telephone area codes and splits. Also features a map of area codes in GIF.
- NPA NXX Source
- Compiles telephone area codes and local exchange data for the United States, Canada, and most of the Caribbean.
- Philippines Telephone Area Codes
- Comprehensive list of telephone codes used within the Philippine territory.
- UK Phone Information
- Free online source for UK telecommunications information. Features a code locator and links to related resources.
- US Area Codes
- Do area, city, or state lookup; browse over the city and state directory; or add a city or area code not registered in the list.
- Who Owns This Phone Number
- Reverse phone lookup service that provides owner and location information. Includes links to other phone number search sites.
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