The 339 area code covers the same area as 781, including Waltham, Lexington and 38 more places in Massachusetts.
Area code 339 is in Massachusetts, on Eastern Time. In the 339 area, phone numbers are given out most in Middlesex County, then Norfolk and Plymouth counties. It has been in service since May 2, 2001. 781 covers the same area, so two neighbours can have different area codes.
- Where
- 5 counties in Massachusetts, mostly Middlesex County, Norfolk County and Plymouth County
- Time zone
- Eastern Time
- In service since
- May 2, 2001
- Shares its area with
- 781 (since 1997)
- Prefixes in use
- 104
- How to dial
- Local calls need all 10 digits: 339-555-0142.
Find out who called you from a 339 number.
Enter the full 10-digit number to see who it is listed to and the city and state on the listing. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (339) number is on today, use our free carrier lookup.
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Lynn holds 9% of the phone prefixes in area code 339.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 104 prefixes in use shows where 339 numbers are actually given out.
- Lynn9 prefixes, 9%
- Weymouth7 prefixes, 7%
- Bryantville7 prefixes, 7%
- Saugus6 prefixes, 6%
- Lexington5 prefixes, 5%
- Medford5 prefixes, 5%
- Woburn5 prefixes, 5%
- Randolph4 prefixes, 4%
Also served: Medford, Canton, Norwood and Weymouth and 28 smaller places.
Of the carriers named here, PAETEC (Windstream) holds the most phone number prefixes in area code 339: 11 of 104.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 104 prefixes in use in 339 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| PAETEC (Windstream)Windstream's business phone network | 11 | 11% |
| Level 3 (Lumen)Lumen's business and wholesale network | 8 | 8% |
| Fractel | 7 | 7% |
| Ton80 Communications | 7 | 7% |
| T-MobileMobile network | 6 | 6% |
| Metro by T-MobileT-Mobile's prepaid brand | 4 | 4% |
| 16 other carriers | 61 | 59% |
99% of these prefixes are pooled, which means the blocks of 1,000 numbers inside them can belong to other carriers. Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
339 started in 2001 as an overlay on 781, and its ground has not changed since.
2001
339 starts on May 2, 2001, as an overlay on 781: new numbers on the same ground.
A 339 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 339 are 617, 508 and 978.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
Massachusetts has 8 other area codes.
These are the questions people ask most about area code 339.
Where is area code 339?
339 covers Waltham, Lexington, Burlington and Lynn and 36 more places in Massachusetts. In the 339 area, phone numbers are given out most in Middlesex County, then Norfolk and Plymouth counties.
What state is area code 339 in?
Massachusetts. 339 is a Massachusetts area code on Eastern Time.
What cities use area code 339?
The places holding the most 339 prefixes are Waltham, Lexington, Burlington, Lynn, Woburn, Dedham, Needham and Braintree, out of 40 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 339?
No single phone company owns 339. NANPA's records list its 104 prefixes across many carriers, and the ones named on this page include PAETEC (Windstream), Level 3 (Lumen) and Fractel. Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 339 in?
339 is on Eastern Time.
When did area code 339 start?
339 went into service on May 2, 2001, as an overlay on 781: new numbers for the same area.
Is 339 the same area as 781?
Yes. 781 (since 1997) covers the same ground as 339. Nobody's number changed when it was added; new lines simply get whichever code has numbers left, so two neighbours can have different codes.
How do I dial a 339 number?
Local calls need all 10 digits: 339-555-0142.
Is 339 a toll-free number?
No. 339 is a regular area code for Waltham and Lexington in Massachusetts, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 339?
The closest are 617/857 (Boston, Massachusetts), 508/774 (Worcester, Massachusetts), 978/351 (Lowell, Massachusetts) and 401 (Providence, Rhode Island), measured between the centres of each area.
Who called me from a 339 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 339 a scam?
339 is a real Massachusetts area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.