617 Area Code is part of 3 counties in the state of Massachusetts. There are around 6 cities and 6 other places such as towns, cdps and villages in the 617 area code. Area code 617 is a telephone area code in the North American Numbering Plan (NANP) for the U.S. state of Massachusetts. Below you will find more info about Code and also zip codes, counties, cities and the post offices that belong to this Area Code.
Sources: North American Numbering Plan Administration (NANPA), telecom providers, and the U.S. Census Bureau.