International dialling codes
United States dialling code: +1
United States: everything needed to dial a local number from abroad — code +1, trunk prefix and accepted number lengths.
Short answer
United States has the dialling code +1. The country uses the trunk prefix 1, which is dropped when dialling internationally: dial +1 then the number without that prefix. A valid national number has 10 digits.
Numbering data
| International dialling code | +1 |
|---|---|
| ISO code | US |
| Trunk prefix | 1 |
| National number length | 10 digits |
| Outgoing international prefix | 011 |
| Sending from this service | not open |
Frequently asked questions
- United States: what is the telephone dialling code?
- United States has the international dialling code +1. It is dialled after the calling country's outgoing prefix — 00 from France and most of Europe. A national number there has 10 digits.
- United States: should the leading zero be dropped?
- Yes. United States uses the trunk prefix 1, reserved for domestic calls. When dialling internationally it is dropped: +1 followed by the number without that prefix.