Country code · North America and the Caribbean
United States country code: +1
How to write United States phone numbers for your CRM, dialer or SMS tool, and what TrueSearch does with them.
| Country or territory | United States |
| Calling code | +1 |
| ISO 3166 code | US |
| Region | North America and the Caribbean |
| E.164 format | +1NPANXXXXXX |
+1 is shared with Canada, Puerto Rico, U.S. Virgin Islands, Guam, Northern Mariana Islands, American Samoa, Bahamas, Barbados, Anguilla, Antigua and Barbuda, British Virgin Islands, Cayman Islands, Bermuda, Grenada, Turks and Caicos Islands, Jamaica, Montserrat, Sint Maarten, Saint Lucia, Dominica, Saint Vincent and the Grenadines, Dominican Republic, Trinidad and Tobago, Saint Kitts and Nevis.
Checking United States numbers with TrueSearch
United States is part of the North American Numbering Plan, so TrueSearch reads its numbers like US and Canadian numbers: 10 digits, or 11 starting with 1, with or without the +. Each number gets the live check for valid or dead, line type and carrier.
US and Canadian numbers are TrueSearch's main use case: lists from your CRM, dialer or spreadsheet, checked in bulk or through the API.
Upload a CSV or Excel file. Get back every number marked valid or dead, mobile, landline or VoIP, with carrier.
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Questions
What is the country code for United States?
+1. The same calling code is also used by Canada, Puerto Rico, U.S. Virgin Islands, Guam, Northern Mariana Islands, American Samoa, Bahamas, Barbados, Anguilla, Antigua and Barbuda, British Virgin Islands, Cayman Islands, Bermuda, Grenada, Turks and Caicos Islands, Jamaica, Montserrat, Sint Maarten, Saint Lucia, Dominica, Saint Vincent and the Grenadines, Dominican Republic, Trinidad and Tobago, Saint Kitts and Nevis.
How do I format a United States number in E.164?
Write + then 1, the 3-digit area code and the 7-digit number, with no spaces or dashes: +1NPANXXXXXX.
Can TrueSearch check United States numbers?
United States is part of the North American Numbering Plan, so TrueSearch reads its numbers like US and Canadian numbers: 10 digits, or 11 starting with 1, with or without the +. Each number gets the live check for valid or dead, line type and carrier.
Is every result marked keep?
No. TrueSearch marks a number keep only when it is valid and a mobile line. Landline, VoIP, toll-free and dead numbers are flagged with the reason.
Does TrueSearch check Do Not Call lists?
No. TrueSearch does not check the US National Do Not Call Registry, state DNC lists, litigator lists or any country's do-not-call register.
More North America and the Caribbean calling codes
Free tool: convert a list of numbers to E.164
Calling codes: ITU-T E.164 country code assignments. This guide is general information, not legal advice. TrueSearch for Business checks validity, line type and carrier from licensed telecom data. It does not check the National Do Not Call Registry, state DNC lists or the FCC Reassigned Numbers Database. Not a consumer reporting agency; not for FCRA purposes.