libphonenumber API

United States Phone Number Format

Country code +1 · ISO US

How to format, dial, and validate United States phone numbers, with live examples.

Country Code

+1

National Prefix

1

International Prefix

011

Mobile Portability

Yes

Try it now

Pre-filled with a valid fixed line number for United States. Edit it and click "Try It" to see the parsed result.

Number Types & Example Formats

Each United States phone-number type supported by libphonenumber, with a real example formatted three ways.

Type Length National International E.164
Fixed Line 10 digits (201) 555-0123 +1 201-555-0123 +12015550123
Mobile 10 digits (201) 555-0123 +1 201-555-0123 +12015550123
Personal Number 10 digits (500) 234-5678 +1 500-234-5678 +15002345678
Premium Rate 10 digits (900) 234-5678 +1 900-234-5678 +19002345678
Toll Free 10 digits (800) 234-5678 +1 800-234-5678 +18002345678

How to Dial United States Numbers

From abroad

Dial +1 followed by the national number, dropping any leading 1.

Within United States

Dial 1 before the local number to make a domestic call.

Dialing out of United States

Dial 011 followed by the destination country code and number.

Area Codes

Browse United States area codes with cities, timezones, and example numbers for each.

View United States area codes →

Validate a United States Number with the API

Send the number to the free libphonenumber API to get the parsed country, type, formatting, and validity.

Request 
curl https://libphonenumberapi.com/api/phone-numbers/+12015550123

Frequently Asked Questions

What is the country code for United States?

└ The international country code for United States is +1. Use this prefix when dialing United States numbers from another country.

How long is a United States phone number?

└ United States phone numbers are typically 10 digits, not including the +1 country code.

How do I dial a United States phone number from abroad?

└ From abroad, dial +1 followed by the national number, dropping any leading 1. Within United States, dial 1 before the local number.

How do I validate a United States phone number programmatically?

└ Send a GET request to https://libphonenumberapi.com/api/phone-numbers/<number>. The free libphonenumber API returns the parsed country, format, type, and validity for any number — no API key required.

Other Countries with Dialing Code +1

These countries share the same international dialing prefix as United States.