Massachusetts · Eastern Time
339 Area Code
Area code 339 is in Massachusetts, serving inner Boston suburbs ringing the 617 area, from Lynn to Weymouth. It is in the Eastern Time zone. It shares its territory with overlay code 781, so 10-digit dialing is required.
Last updated October 1, 2026 · Source: NANPA
Where is the 339 area code?
339 is a Massachusetts area code covering inner Boston suburbs ringing the 617 area, from Lynn to Weymouth. In the wider directory it sits in the Northeast region.
Cities in the 339 area code
- Lynn
- Waltham
- Malden
- Medford
- Revere
- Weymouth
- Woburn
- Braintree
- Lexington
- Burlington
- Needham
- Saugus
- Stoneham
- Wellesley
Counties served by 339
Middlesex County, Essex County, Norfolk County, Plymouth County and Suffolk County.
339 overlay codes and dialing
The 339 territory is covered by an overlay of 2 area codes: 339, 781. All of them serve the same geographic area, and the original code is 781. Because more than one code covers the same ground, 10-digit dialing is mandatory — you must dial the area code for every local call. New phone lines may be assigned any of these codes.
History of the 339 area code
339 went into service on May 2, 2001 as an overlay of 781, relieving number exhaustion in the Lynn area. Rather than splitting the region, the overlay lets existing customers keep their numbers while new lines draw from the added code. Learn more in our overlay guide.
Is 339 a scam or spam risk?
339 is a legitimate geographic area code, not a premium or toll line, so a call from it costs you nothing extra. That said, scammers frequently spoof real local area codes to look familiar on caller ID. A genuine 339 number on your screen is no guarantee the caller is in Lynn, MA or trustworthy. See spam & scam-risk area codes for how spoofing works and how to respond.
Other Massachusetts area codes
Explore more
See every code in Massachusetts, compare codes across the Northeast region, or view all Eastern Time codes. You can also browse the 3XX block or the complete numeric list of US area codes.
New to how this all works? Start with how area codes work, then read up on overlays, 10-digit dialing, and spam & scam-risk codes. To check another number, use the area code lookup tool.
Quick answers
339 area code FAQ
Where is the 339 area code?
The 339 area code is in Massachusetts, covering inner Boston suburbs ringing the 617 area, from Lynn to Weymouth, in the Northeast region.
What cities are in the 339 area code?
Cities in the 339 area code include Lynn, Waltham, Malden, Medford, Revere, Weymouth, Woburn, Braintree, Lexington and Burlington.
What time zone is 339 in?
339 is in the Eastern Time zone.
What is the overlay for the 339 area code?
339 shares its territory with 781. Both codes (339, 781) serve the same area, so 10-digit dialing is required for every call.
When did the 339 area code start?
339 went into service on May 2, 2001 as an overlay of 781.
Do I have to dial 10 digits for 339?
Yes. Because 339 is an overlay area, you must dial the full 10-digit number (area code + 7 digits) for every call.
Is 339 a toll-free or premium code?
No. 339 is a standard geographic area code, so calling it costs the same as any local or long-distance call on your plan. Toll-free calls use 800, 888, 877, 866, 855, 844 or 833.