617 Area Code
Boston (core), Massachusetts
Area code 617 is located in Boston (core), Massachusetts. It covers Boston, Cambridge, and surrounding areas in the Eastern time zone (UTC-5). Administered by NANPA.
Where is area code 617?
Area code 617 is located in Boston (core), Massachusetts. It covers Boston, Cambridge, and surrounding areas in the Eastern time zone (UTC-5).
Area code 617 is overlaid by area code 857. Both codes serve the same geographic region and require 10-digit dialing for local calls.
Cities Covered by Area Code 617
Area code 617 primarily serves the Boston (core) area of Massachusetts. The exact coverage includes Boston, Cambridge, and Newton (part), along with surrounding communities and suburbs.
Time Zone
Eastern Time — UTC-5
Area code 617 operates in the Eastern Time Zone. When calling 617 numbers from a different time zone, be sure to account for the time difference to reach people during business hours.
About Area Code 617
Area code 617 was introduced in 1947 as a geographic area code serving Boston (core), Massachusetts. As demand for phone numbers grew, overlay code 857 was added to the same region, requiring 10-digit dialing for local calls. Area codes are administered by NANPA (North American Numbering Plan Administration), the organization responsible for managing phone number resources in the US and Canada.