What is what area code is 339?

Area code 339 is a telephone area code in Massachusetts, United States. It serves the southern suburbs of Boston, including cities such as Waltham, Weymouth, and Quincy. Area code 339 was created in 2001 as an overlay of area code 781 to meet the increasing demand for phone numbers in the region. It is currently one of the three area codes serving eastern Massachusetts, along with 617 and 781.