Area codes 781 and 339


Area code 781 covers most of Boston‘s inner suburbs and some outer suburbs. It was created as a split from area code 617 on September 1, 1997. Use of 781 became mandatory February 1, 1998. Area code 339 has been sharing the service area since May 2, 2001. Since then, 10 digit local dialing is mandatory.
Some mobile phone numbers from the 1990s assigned to rate centers in 781 and 339 kept the 617 area code just on those mobile lines after it was split.

Communities

Portions of the following counties are covered:
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