Re: NPA-NXX Lists

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Jan Schmidt asked:

Am looking for a site where one can enter the AC and NNX and find out
> what city the telephone number is located in.

The US NPA-NXX lists, direct from Neustar NANPA (North American Numbering Plan Administration), can be found at:

and then click on "Central Office Code Utilized Reports", and then select the state and NPA you wish to find the NXX central office code for. There will be information as to the city and "default" telephone company that the NPA-NXX code is associated with. As for the telephone company, remember that there is also "thousands-blocks" sub-assignments, as well as portability, which isn't necessarily reflected in these lists.

Neustar NANPA's Central Office Code data will include only United States jurisdictions, including DC, Alaska (907), Hawaii (808), Puerto Rico (787 and its 939 overlay), US Virgin Islands (340), Guam (671), the Northern Mariana Islands: Saipan, Tinian, Rota (670), and American Samoa (684).

Canadian NPA-NXX lists can be found from the SAIC CNA (Canadian Numbering Administrtor)'s website, at:

Click on the area code region on the map of Canada, or the area code as indicated in the list of codes just below the map, and you'll get a larger list of all NXX central office codes and information as to the city and "default" assigned telephone company. Again, remember that with portability, the customer might have ported their number away from the "default" telephone company assigned.

Those parts of the Caribbean which are a part of the NANP (North American Numbering Plan, Country Code +1) but outside of the United States (i.e., the Dominican Republic, and also the various "British" islands, such as Bermuda, Bahamas, Jamaica, Trinidad & Tobago, Grenada, etc) assign their own NXX codes within their NANPA assigned NPAs. You might have to find individual websites maintained by the various island country's numbering assignment bodies for further details.

However, Ray Chow (of Toronto ON Canada) maintains a "Local Calling Area" website, which can be a very useful resource for the entire NANP region, including those Caribbean areas part of the NANP but not part of the US:

But also note: Ray has indicated in the Yahoo Group he created on local calling area issues, that he might need to move his website to another server/domain in the near future!

Hope this helps!