To enter a US phone number with country code, use the format +1 555 123 4567 for readability or +15551234567 for systems that require the E.164 standard. The plus sign and the 1 must always come first, followed by the three-digit area code and the seven-digit local number.
How to enter a US phone number with country code
There are two standard formats. For everyday use, such as saving a contact or writing a number on a business card, use the readable format: +1 555 123 4567. For databases, CRMs, APIs, and web forms that require strict formatting, use the E.164 international standard: +15551234567 (plus sign, country code, and 10 digits with no spaces, dashes, or parentheses). Both formats begin with the +1 country code.
Understanding the US phone number format
A US phone number has three components. The country code is +1, which is part of the North American Numbering Plan (NANP) shared by Canada and several Caribbean nations. The area code is three digits and identifies a geographic region. The local number is seven digits. Without the country code, a US number is 10 digits. When you add the +1 country code, the full international number becomes 11 digits.
What the plus sign (+) really means
The plus sign is a universal placeholder. Using +1 instead of a specific exit code is the safest method because it works from any country without you needing to remember a different exit code each time. When dialing from outside the United States, include the appropriate international dialing prefix before the country code, as this code varies by originating country.
Common mistakes to avoid
- Forgetting the +1 when dialing from abroad: Without the country code, the call will not connect to the United States.
- Including a leading zero: US area codes and local numbers never start with a zero. Adding one will break the number. When entering a US phone number with the country code, omit any leading zeros that may be present in the area code or local phone number.
- Entering spaces, hyphens, or parentheses can cause errors.
- Omitting the +1 when saving a contact: If you save a US number without the country code and later try to call it from outside the US, the call will fail.
Understanding international calling codes and dialing rules helps you avoid these errors. Knowing the us country code phone is +1 is the first step. Familiarity with phone number formats and digits ensures your number works everywhere.
Frequently Asked Questions
Can I use parentheses or hyphens when entering a US phone number with a country code?
Yes, for readability you can use parentheses or hyphens, such as +1 (555) 123-4567 or +1-555-123-4567. However, when entering the number into a system that requires the E.164 standard, you must remove all punctuation and use only +1 followed by 10 digits.
Do all US phone numbers require a country code?
Only when dialing from outside the United States. When calling a US number from within the US, you can dial the 10-digit number (area code + local number) or just the 7-digit local number for local calls. From abroad, you must include +1.
What happens if I dial a US number without the country code from another country?
The call will not connect to the United States. It may be routed to a different country or you will hear an error message. The +1 country code is required for international calls to reach the US.
Is the country code the same for US landlines and mobile phones?
Yes. Both landline and mobile phone numbers in the United States use the same country code: +1. The format and dialing rules are identical for both types of numbers.
For the wider topic, see international calling codes and dialing.
