United States phone number format
How do you format a United States phone number?
Write a United States phone number with the country code +1. A mobile 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. A format check confirms the digits fit the numbering plan, not that the number is in service.
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Paste your United States numbers (a mixed list is fine). They are counted here at once; the free checker then gives every number its E.164 form, country and line type, with a file to download.
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See the phone add-onUnited 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 |
In short: +1, 10 digits for a mobile. The checker below formats any United States number free in your browser; it can't say whether a line is live. Bulk phone number validator · Pro + Phone plan
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.
Mobile, landline and special number ranges in United States
Google's data lists no separate mobile range for United States, so mobiles and landlines share the same digits. Every valid number of each type below starts with one of the digit groups shown. A number that starts the right way can still be unassigned: the groups say what a range is for, not that a number is connected.
| Type | Starts with, after +1 | Digits | Example |
|---|---|---|---|
| Landline (fixed line) | 20–28, 30–36, 38, 40–48, 50–58, 60–68, 70–78, 80–87, 90–95, 97, 98 | 10 | +1 201 555 0123 |
| Toll-free | 8002–8009, 8332–8339, 8442–8449, 8552–8559, 8662–8669, 8772–8779, 8882–8889 | 10 | +1 800 234 5678 |
| Premium rate | 9002–9009 | 10 | +1 900 234 5678 |
| Personal number | 500, 521–529, 532, 533, 544, 566, 577, 588 | 10 | +1 500 234 5678 |
More on United States’s free-to-call and charged ranges: toll-free and premium numbers in the United States.
Sources, checked 5 November 2026
- Ranges, lengths and examples: Google libphonenumber numbering-plan data (libphonenumber-js 1.13.15), the data our validator uses.
- Official plan: ITU-T E.164 national numbering plan for United States. The regulator’s filing is the authority when the two disagree.
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 Pro + 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.
- Does a valid format mean a United States number is in service?
- No. A valid format means the digits fit a range United States's numbering plan allocates. It cannot tell whether the number is connected today or who carries it, because numbers are reassigned and ported. A live carrier lookup reports the current carrier and line type, but even that does not prove someone answers.
- Can I check a list of United States numbers for free?
- Yes. Paste them in the list tab above or upload a CSV to the bulk phone number validator: E.164, country, format status and numbering-plan line type are free for every row, with no account. Live carrier and line-type lookups come with Pro + Phone at $49.99/mo (5,000 a month).
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