United States phone number format
United States phone numbers use the country code +1. A mobile number looks like (201) 555-0123 inside the United States and +1 201 555 0123 from abroad. Mobiles have 10 digits after the country code, and the E.164 form is +12015550123.
United States number format at a glance
| Country calling code | +1Shared with American Samoa, Anguilla, Antigua & Barbuda, Bahamas, Barbados, Bermuda, British Virgin Islands, Canada, Cayman Islands, Dominica, Dominican Republic, Grenada, Guam, Jamaica, Montserrat, Northern Mariana Islands, Puerto Rico, Sint Maarten, St. Kitts & Nevis, St. Lucia, St. Vincent & Grenadines, Trinidad & Tobago, Turks & Caicos Islands, U.S. Virgin Islands |
|---|---|
| International prefix (calling out of the United States) | 011 |
| Trunk prefix (domestic dialling) | None |
| Mobile number length | 10 digits after +1 |
| Landline number length | 10 digits after +1 |
| Mobile vs landline from the digits | Not reliably, many ranges are shared |
Example United States phone numbers
These are the example numbers from Google’s libphonenumber data, the same numbering-plan data our validator uses, written three ways.
| Format | Mobile | Landline |
|---|---|---|
| National (inside the United States) | (201) 555-0123 | (201) 555-0123 |
| International | +1 201 555 0123 | +1 201 555 0123 |
| E.164 | +12015550123 | +12015550123 |
How to write a United States number in E.164
- Remove spaces, dashes, dots and brackets so only digits are left.
- The United States has no trunk prefix, so keep every digit of the national number.
- Put +1 in front. The result has 10 digits after the country code for a mobile.
So (201) 555-0123 becomes +12015550123. E.164 is the format SMS gateways, dialers and most CRMs store; see the E.164 format explained for why.
Mobile or landline?
In Google’s numbering-plan data, many United States ranges are listed as “fixed line or mobile”, so the digits alone can’t always say whether a number takes texts. A live carrier lookup asks the network which kind of line serves the number now. More in mobile vs landline lookup.
Validate a list of United States numbers
Check a single number with the free phone number validator. For a whole file, upload the CSV to the verifier: every row gets a status, the E.164 number, the country and the line type, and emails in the same file get a live mailbox check. The Email + Phone plan ($49.99 a month) adds 5,000 live carrier lookups a month for the real line type and current carrier.
Common questions
- What is the country code for the United States?
- The country calling code for the United States is +1. It is shared with 24 other countries and territories, so the number after it decides which one a number belongs to. When you call the United States from abroad, dial your international prefix (or +) followed by 1 and the number.
- How many digits is a United States phone number?
- A United States mobile number has 10 digits after the country code +1, the same as a landline.
- How do I write a United States number in international format?
- Start with +1, then add the rest of the number. The mobile number (201) 555-0123 becomes +1 201 555 0123, or +12015550123 in E.164, the form most CRMs and SMS tools expect.
- Can you tell if a United States number is a mobile?
- Not always from the digits. In Google's numbering-plan data many United States ranges are listed as "fixed line or mobile", so the number alone doesn't settle it. A live carrier lookup asks the network which kind of line serves the number today.
That was one number. Your CRM export has thousands.
This tool checks one number at a time. Cleaning a list means every row in E.164, invalid numbers separated out, and the emails beside them checked too.
- Upload a CSV up to 100,000 rows with an email or phone column
- Every phone gets status, E.164 format, country and line type
- Emails in the same file get a real SMTP mailbox check
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