Find any 857- phone number in Massachusetts
The 857 area code is part of the North American Numbering Plan, a system that assigns geographic area codes to specific regions across North America, including the United States, Canada and Mexico. 857 is a North American area code that serves the Greater Boston area and eastern Massachusetts, including the cities of Salem, Plymouth, and Cambridge. It was introduced in 2001 when area code 617, which had been in use since 1947, ran out of available central office codes. In 2001, 857 replaced 617 and the North American Numbering Plan Administration issued 10 central office codes for 857.
The North American Numbering Plan divides phone numbers into area codes and central office codes, with the area code being the first three digits of a phone number. Area codes are used to indicate which region a phone number belongs to. With the 857 area code, calls made to this area are routed to the Greater Boston area and eastern Massachusetts. As of 2021, 857 is one of the most widely used area codes in the United States and its popularity is expected to continue to grow in the years to come.