866 Area Code

866 is not tied to any state or city — it is a toll-free code: calls are free for the caller within the US and Canada and are paid by the business that owns the number. NANPA lists it as in service since 2000. A call from 866 can come from anywhere in North America.

Other toll-free codes:800833844855877888

Sources: North American Numbering Plan Administrator (NANPA) NPA database (10/25/2026); major cities from Wikidata (CC0). An area code shows where a number was first assigned — with number portability and mobile phones, the caller may be anywhere.