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This is a list of area codes in Massachusetts: As of March 2010, Massachusetts is split into two main regional calling areas. Eastern Massachusetts is considered as area codes: 339, 351, 508, 617, 774, 781, 857, and 978. Western Massachusetts is considered as area code 413. Area codes 339, 351, 774, and 857 are used on mobile lines; few or no landlines use them. Cell phones also frequently use 508, 617, 781 and 978.