North American Numbering Plan

The North American Numbering Plan (NANP) is a telephone numbering plan that encompasses 25 distinct regions in twenty countries primarily in North America, including the Caribbean and the U.S. territories. Not all North American countries participate in the NANP.

The NANP was originally devised in the 1940s by AT&T for the Bell System and independent telephone operators in North America, to unify the diverse local numbering plans that had been established in the preceding decades. After AT&T administration of the numbering plan until the breakup of the Bell System, administration was delegated to the North American Numbering Plan Administration (NANPA), a service that has been procured from the private sector by the Federal Communications Commission (FCC) in the United States. Each participating country forms a regulatory authority that has plenary control over local numbering resources. The FCC also serves as the U.S. regulator. Canadian numbering decisions are made by the Canadian Numbering Administration Consortium.

The NANP divides the territories of its members into numbering plan areas (NPAs) which are encoded numerically with a three-digit telephone number prefix, commonly called the area code. Each telephone is assigned a seven-digit telephone number unique only within its respective plan area. The telephone number consists of a three-digit central office code and a four-digit station number. The combination of an area code and the telephone number serves as a destination routing address in the public switched telephone network (PSTN). For international call routing, the NANP has been assigned the international calling code 1 by the International Telecommunications Union (ITU). The North American Numbering Plan conforms with ITU Recommendation E.164, which establishes an international numbering framework. (...) read more.

Source: Wikipedia

Country International Calling Code
American Samoa more info +1 XXX-XXX-XXXX
Anguilla more info +1 XXX-XXX-XXXX
Antigua and Barbuda more info +1 XXX-XXX-XXXX
Bahamas more info +1 XXX-XXX-XXXX
Barbados more info +1 XXX-XXX-XXXX
Bermuda more info +1 XXX-XXX-XXXX
British Virgin Islands more info +1 XXX-XXX-XXXX
Canada more info +1 XXX-XXX-XXXX
Cayman Islands more info +1 XXX-XXX-XXXX
Dominica more info +1 XXX-XXX-XXXX
Dominican Republic more info +1 XXX-XXX-XXXX
Grenada more info +1 XXX-XXX-XXXX
Guam more info +1 XXX-XXX-XXXX
Jamaica more info +1 XXX-XXX-XXXX
Montserrat more info +1 XXX-XXX-XXXX
Northern Mariana Islands more info +1 XXX-XXX-XXXX
Puerto Rico more info +1 XXX-XXX-XXXX
Saint Kitts and Nevis more info +1 XXX-XXX-XXXX
Saint Lucia more info +1 XXX-XXX-XXXX
Saint Vincent and Grenadines more info +1 XXX-XXX-XXXX
Sint Maarten more info +1 XXX-XXX-XXXX
Trinidad and Tobago more info +1 XXX-XXX-XXXX
Turks and Caicos Islands more info +1 XXX-XXX-XXXX
United States more info +1 XXX-XXX-XXXX
United States Virgin Islands more info +1 XXX-XXX-XXXX