The national number following the country code can vary in length by country. Dialing procedures vary by your localion, telephone provider and by the smartphone app being used.
The international “country code” for the North American Numbering Plan (NANP) is “1”. “Country codes” for dialing are “1 to 3 digits” in length. The “001” may be a display or form format.
Some telephone system country codes
United States Awardee Immunization Websites | CDC links lists the following locations including US “dependant areas”. Telephone country codes have been added to the list.
Note: For dates of free association with the United States see “Dependant Areas” section in United States - The World Factbook (cia.gov).
North American Numbering Plan
Per the North American Numbering Plan Administrator - About us webpage https://www.nationalnanpa.com/about_us/
The North American Numbering Plan (NANP) is an integrated telephone numbering plan serving 20 North American countries that share its resources. These countries include the United States and its territories, Canada, Bermuda, Anguilla, Antigua & Barbuda, the Bahamas, Barbados, the British Virgin Islands, the Cayman Islands, Dominica, the Dominican Republic, Grenada, Jamaica, Montserrat, Sint Maarten, St. Kitts and Nevis, St. Lucia, St. Vincent and the Grenadines, Trinidad and Tobago, and Turks & Caicos.
Some NANP areas that are not states or Washington, D.C.
The NANP Country / Territory Map page https://www.nationalnanpa.com/area_code_maps/area_code_maps_Country_Territory.html includes the following (and more).
||Country / Territory
|| US Virgin Islands
||Caribbean, islands between the Caribbean Sea and the North Atlantic Ocean, east of Puerto Rico
Northern Marianna Islands (CMNI)
||Oceania, islands in the North Pacific Ocean, about three-quarters of the way from Hawaii to the Philippines
||Oceania, island in the North Pacific Ocean, about three-quarters of the way from Hawaii to the Philippines
|| American Samoa
||Oceania, group of islands in the South Pacific Ocean, about half way between Hawaii and New Zealand
|| Puerto Rico
||Caribbean, island between the Caribbean Sea and the North Atlantic Ocean, east of the Dominican Republic
- North American Numbering Plan Administrator. “North American Numbering Plan Administrator.” [This site provides information about the North American Numbering Plan (NANP) and its administration. The NANP is the numbering plan for the Public Switched Telephone Network for Canada, the US and its territories, and some Caribbean countries.]. Accessed 2022-02-02. https://www.nationalnanpa.com/.
- Telecommunication Standardization Bureau of ITU. 2011. “Dialling procedures (international prefix, national (trunk) prefix and national (significant) number (in ITU-T Recommendation E.164 (11/2010) - Annex to ITU OB 994-E.” Operational Bulletin 994-E. Geneva, Switzerland: International Telecommunication Union. https://handle.itu.int/11.1002/pub/8056d56c-en.
- The World Factbook (cia.gov)
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Created 2 Febuary 2022, version 2020-02-03-Y DRAFT