East Watertown, Massachusetts Area Code

East Watertown, MA is officially utilizing an area code overlay in which area codes 617 and 857 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary.

In addition to East Watertown, MA area code information read more about area codes 617 and 857 details and Massachusetts area codes.

East Watertown, MA is located in Middlesex County and observes the Eastern Time Zone. View our Times by Area Code tool.