The North American Numbering Plan - NANP

Facts about the NANP:

The North American Numbering Plan serves 20 countries including the United States and several US overseas territories
All 20 countries part of the NANP have the same telephone numbering format: YXX-YXX-XXXX where Y can be any digit from 2 through 9 and X can be any digit
All countries part of the NANP have country code 1(one)

Countries and their area codes within the NANP:

Anguilla: 264
Antigua & Barbuda: 268
Bahamas (the): 242
Barbados: 246
Bermuda: 441
British Virgin Islands (the): 284
Canada: multiple area codes
Cayman Islands (the): 345
Dominica: 767
Dominican Republic (the): 809/829/849
Grenada: 473
Jamaica: 876
Montserrat: 664
Saint Kitts and Nevis: 869
Saint Lucia: 758
Saint Vincent and the Grenadines: 784
Sint Maarten: 721
Trinidad and Tobago: 868
Turks & Caicos: 649
United States of America: multiple area codes
US Territories:
- American Samoa: 684
- Guam: 671
- Northern Mariana Islands: 670
- Puerto Rico: 787/939
- US Virgin Islands: 340

Dialing between any 2 NANP countries/territories above:

1 + NANP area code + 7 digit number

Sample call:

From the United States to Jamaica: 1 876 ??? ????

Are calls between 2 NANP countries charged international rates?

This is an important issue as it may seem logical to consider calls between countries sharing the North American Numbering Plan as domestic calls. This however is not the case: calls between NANP countries or territories are considered international calls and charged accordingly. The good news here is that these rates are usually not much higher than domestic rates and in some cases they are even lower (not the case when using a wireless plan).

Dialing to a NANP country from any country outside North America:

To call from a country outside North America to any of the countries regulated by the NANP you should dial the following: your country's exit code + 1 + ??? + ??? ????.

Sample calls: