Area code 339 was added as an overlay to area code 781 in 2001. Area code 781 was created in 1997 when the code 617 split in order to facilitate the telephone customers conveniently.
Demands for telephone connections increase as population increases. New area codes are created by splitting a geographical area into new smaller regions. One region keeps the same code and the other region changing to a new code.
On the other hand overlay is added as a second area code within same geographic boundary. As a result, one area might use multiple codes. Telephone numbers which are already in use will not be altered while people demanding new telephone connections will be given phone numbers with the new overlaid codes
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