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Area codes 617 and 857 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of Massachusetts, serving the city of Boston and several surrounding communities such as Brookline, Cambridge, Newton and Quincy.
The 617 Area Code Map above shows the geographic region it covers. It has a single overlay (857) that serves the same geographic area. Combined, this Area Code (and overlays), serves a population of 4,496,567. Area Code 617 has a single Timezone of Eastern (GMT -05:00).
Area code 617 serves the state of Massachusetts. This area code was assigned on January 1st, 1947. On January 1st, 1947 it went into service. 617 is a General Purpose Code. 617 service area does overlap with 857 area codes. Dialing pattern for local calls within the same NPA (area code) is 10D.
Area codes 617 and 857 are telephone area codes in the North American Numbering Plan (NANP) for the U.S. state of Massachusetts, serving the city of Boston and several surrounding communities such as Brookline, Cambridge, Newton and Quincy.
Massachusetts is divided into five distinct numbering plan areas (NPAs), which are served by nine area codes in the North American Numbering Plan (NANP), [1] organized as four overlay complexes and a single-area code NPA. Eastern Massachusetts has area codes 339, 351, 508, 617, 774, 781, 857, and 978. [2] Western Massachusetts has area code 413 ...
Area codes 617 and 857 are the North American area codes serving Boston and several surrounding communities in Massachusetts—such as Brookline, Cambridge, Newton and Quincy (LATA code 128).
Area code 617 was split with 508 covering central and southern Massachusetts. September 1, 1997. Area code 617 was split with 781 covering all but the inner Boston area. May 2, 2001. Area code 857 was overlaid on 617.
Area code 857 is the area code for Boston, MA. Area code 857 overlays the area code of 617. Cities that use 857 area code and a coverage map included as well.
However, after the invention of the telephone, the 617 area code was implemented for use in the state of Massachusetts. After its initial implementation, it was used for the eastern half of the state, but it was later split to cover the metropolitan area of Boston exclusively.
Then finally in May 2001, it was overlaid with the 857 area code. As a result, Boston residents are required to dial ten digit phone numbers when making local calls. Interestingly, the overlay only affected mobile phone numbers and landlines have retained use of the 617 area code.