Find any 339- phone number in Massachusetts
# Massachusetts Area Code 339
The 339 area code is an overlay to the 781 area code, serving portions of eastern Massachusetts including communities south and west of Boston. Established in 2001, the 339 area code was created to meet the growing demand for telephone numbers in the region as businesses and residents increasingly required multiple phone lines and mobile devices. This overlay system means that both 339 and 781 serve the same geographic territory, and callers within this region must dial the full 10-digit number (area code plus seven-digit local number) for all local calls. Communities served by the 339/781 area codes include parts of the suburbs surrounding Boston, such as portions of Norfolk County and other surrounding municipalities.
The North American Numbering Plan (NANP) is the standardized system that designates area codes like 339 throughout the United States, Canada, and other North American territories. When a region exhausts its available phone numbers within a single area code, regulatory authorities implement overlay area codes to provide additional numbering resources without requiring customers to change their existing phone numbers. The NANP allocates three-digit area codes based on geographic regions and population density, with the system managed by telecommunications regulators and industry bodies. The introduction of overlay codes like 339 represents a practical solution to the finite nature of the 10-digit phone numbering system, allowing telecommunications infrastructure to adapt to increasing demand while maintaining service continuity for existing subscribers.