Waltham, Massachusetts Area Code
Waltham, MA is officially utilizing an area code overlay in which area codes 339 and 781 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary.
In addition to Waltham, MA area code information read more about area codes 339 and 781 details and Massachusetts area codes.
Waltham, MA is located in Middlesex County and observes the Eastern Time Zone. View our Times by Area Code tool.