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  3. 866 Prefixes

866 Area Code Phone Directory

Phone Prefixes in the 866 Area Code

(866) 2XX (866) 3XX (866) 4XX (866) 5XX (866) 6XX (866) 7XX (866) 8XX (866) 9XX

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).

Area Codes Starting with 8

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)