866 Area Code Information

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

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