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== Enllaços externs ==
* [http://www.nanpa.com North American Numbering Plan Administration (NANPA)]
* [http://www.asksam.com/eBooks/area_codes/ Search Area Code, Time Zone, and Location info on-line or in free download (US and Canada)] {{Webarchive|url=https://web.archive.org/web/20130622021510/http://www.asksam.com/ebooks/area%5Fcodes/ |date=2013-06-22
* [http://www.askyp.com/Areacode/ AskYP US Area Code]
* [http://www.wtng.info/ World Telephone Numbering Guide]
* [http://www.numberingplans.com/?page=dialling&sub=areacodes Dialing Codes]
* [http://www.areacode-info.com/ Free Area Code Information (All NANP)]
* [http://www.areacodedownload.com/ Free Area Code Listing (US and Canada)] {{Webarchive|url=https://web.archive.org/web/20141031193423/http://www.areacodedownload.com/ |date=2014-10-31
* [http://www.lincmad.com LincMad United States Area Code History and Changes]
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