Area Code 617 History:
Area code 617 was put into service. In 1988 area code 617 was split to form area code 508. In 1997 area code 617 was split to form area code 781. In 2001 area code 617 was overlaid with area code 857.
Counties in Massachusetts within area code 617 include:
Middlesex County, Norfolk County, and Suffolk County.
Major cities or places in Massachusetts within area code 617 include:
Area codes 617 and 857 serve an area of east central Massachusetts, including Boston and the close suburbs of Boston. Some of the larger communities served by area codes 617 and 857, include Belmont, Brookline, Cambridge, Chelsea, Everett, Milton, Newton, Quincy, Somerville, Watertown and Winthrop in addition to many smaller communities within the area codes 617 and 857 service area.