Area code 866 (toll-free)
Area code 866 is a non-geographic toll-free code in the North American Numbering Plan.
| Location | Non-geographic |
|---|---|
| Status | In service · since 2000 |
| Overlay codes | 800 Overlays share the same area. Local calls usually need 10-digit dialing. |
| Local dialing | NA |
Format a 866 number
US numbers are written as (866) 555-0123 or 866-555-0123. From outside the US, dial +1 866 555 0123.
Is a call from 866 a scam?
An area code only tells you where a number was assigned. Caller ID can be faked (“spoofed”), so do not trust a call just because the area code looks local. Never share codes or payment details with unexpected callers.
Sources: NANPA via NumberResearch.org (CC BY 4.0); place names and history from Wikipedia (CC BY-SA 4.0). See data sources.