866
Area code
Toll free
Toll free code, in service since 2000-07-29. Part of the 800/888/877/866/855/844/833 overlay complex — ten-digit dialing required.
Split from 800. Overlaid with 800, 833, 844, 855, 877, 888 .
Statusin service
Introduced2000-07-29
Local dialingNA
Time zoneEastern
Last verified2026-09-17
Change history
Recorded events for this NPA- 2000-07-29Area code 866 entered service (created from 800).
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 1999-11-29 | PL-197 ↗ | Assignment of NPA codes 866 and 855 for Toll-Free Service |