866 Area Code Phone Directory

Information for Area Code 866

State: DC
Largest City in Area: WASHINGTON

Where is Area Code 866?

Area code (866) is in the state of DC. Below, are the major cities in the area code (866).

Major Cities in 866

WASHINGTON, DC (410)
CHICAGO, IL (394)
LOS ANGELES, CA (390)
HOUSTON, TX (376)
LAS VEGAS, NV (369)
AUSTIN, TX (353)
PHOENIX, AZ (350)
SAN DIEGO, CA (347)
DALLAS, TX (318)
ROCHESTER, NY (316)

Zip Codes in 866