Area Code 339 – Massachusetts
The phone area code for Massachusetts is 339 (international format +1339). Browse local exchange codes (NXX) and carrier assignments below.
📞 Exchange Codes (NXX) for Area Code 339
Select a central office code to view local carrier data and detailed information
📍 Geographic Location of Massachusetts
Geographic Coverage and Jurisdiction
Area code 339 is a geographic North American Numbering Plan (NANP) code serving the Commonwealth of Massachusetts, specifically the eastern portion of the state. It is an overlay code for the 781 area code, which covers the Greater Boston suburbs north and south of the city, including communities such as Lynn, Quincy, Weymouth, Waltham, and Malden. The overlay was introduced in 2001 to provide additional numbering capacity without requiring existing subscribers to change their numbers. As a result, 339 and 781 share the same geographic boundaries and are assigned to the same rate centers.
Dialing Formats and Caller Instructions
For local calls within the 339/781 overlay area, 10-digit dialing is mandatory. This means callers must dial the area code plus the seven-digit subscriber number (e.g., +1 339 555 0123) even for calls to a neighbor. International callers must use the full E.164 format: +1 339 XXX XXXX. When calling from outside the United States, replace the leading '1' with the international access code of your country (e.g., 011 from many countries). For calls from other NANP countries (e.g., Canada), dial 1 339 XXX XXXX.
Number Allocation and Services
Both 339 and 781 numbers are assigned to fixed-line services, including traditional PSTN and VoIP providers. However, due to number portability, a 339 number may be associated with a mobile or VoIP service, but the prefix itself remains geographically tied to Massachusetts. This is important for emergency services (E911) routing and for determining local presence for business customers.
Overlay Considerations
The 339/781 overlay means that all calls within the region require 10-digit dialing. There is no permissive 7-digit dialing period. This affects both residential and business users. Additionally, the Massachusetts Department of Telecommunications and Cable oversees the allocation of numbers within the commonwealth, ensuring compliance with NANP guidelines.
Practical Examples
- Calling a 339 number from within the overlay: dial 339 555 0123.
- Calling from a U.S. state outside Massachusetts: dial 1 339 555 0123.
- Calling from Europe: dial 00 1 339 555 0123 (or your country's international prefix).