Q:

What is the country code for the United States?

A:

Quick Answer

The country dialing code for the United States is +1. The United States shares this code with 24 other countries and territories as part of the North American Numbering Plan, or NANP.

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Full Answer

The North American Numbering Plan serves 25 countries and territories in total, encompassing a large portion of continental North America, the Caribbean islands, and some U.S. Territories. Not all North America nations participate in the NANP.

The plan was developed by AT&T in 1947 and began implementation in 1951. Due to the NANP, all participating countries and territories share the same numbering resources. As a result, the International Telecommunications Union assigned the +1 calling code to the entire region. The area codes used within the NANP region also use a different format than international calling codes.

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