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The North American Numbering Plan (NANP) divides the territories of its members into geographic numbering plan areas (NPAs). Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits.
This article includes lists of border crossings, ordered from west to east (north to south for Alaska crossings), along the Canada–United States border. Each port of entry (POE) in the tables below links to an article about that crossing. On the U.S. side, each crossing has a three-letter Port of Entry code.
Visa requirements for United States citizens are administrative entry restrictions by the authorities of other states that are imposed on citizens of the United States. As of 2025, holders of a United States passport may travel to 186 countries and territories without a travel visa , or with a visa on arrival .
However, if for example the traveler is transiting the United States on the way to a 6-month stay in Canada, the VWP cannot be used, as the total time in the United States, Canada, Mexico and adjacent islands will be over 90 days. In this case the traveler should apply for a B-1/B-2 visa, or a transit visa. [14]
In the first phase, effective January 23, 2007, nationals of the United States, Canada, Bermuda and Mexico became required to present a passport to enter the United States by air from the Americas. The regulations retained exceptions for U.S. and Canadian citizens with a NEXUS card, and for members of the U.S. military and U.S. Merchant Marine. [5]
A U.S. visa does not authorize entry into the United States or a stay in a particular status, but only serves as a preliminary permission to travel to the United States and to seek admission at a port of entry. The final admission to the United States is made at the port of entry by a U.S. Customs and Border Protection (CBP) officer.
The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union.
This is a list of future area codes in the North American Numbering Plan (NANP) that are in the planning stages for relief of central office code exhaustion in the given numbering plan areas (NPAs). The dates are subject to change during implementation as published in the official NANP Administrator Planning Letters .