The 351 area code covers the same area as 978, including Lowell, Lawrence and 55 more places in Massachusetts.
Area code 351 is in Massachusetts, on Eastern Time. In the 351 area, phone numbers are given out most in Essex County, then Middlesex and Worcester counties. It has been in service since May 2, 2001. 978 covers the same area, so two neighbours can have different area codes.
- Where
- 4 counties in Massachusetts, mostly Essex County, Middlesex County and Worcester County
- Time zone
- Eastern Time
- In service since
- May 2, 2001
- Shares its area with
- 978 (since 1997)
- Prefixes in use
- 91
- How to dial
- Local calls need all 10 digits: 351-555-0142.
Find out who called you from a 351 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 (351) number is on today, use our free carrier lookup.
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Acton holds 8% of the phone prefixes in area code 351.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 91 prefixes in use shows where 351 numbers are actually given out.
- Acton7 prefixes, 8%
- Lowell5 prefixes, 5%
- Danvers4 prefixes, 4%
- Lawrence4 prefixes, 4%
- Georgetown4 prefixes, 4%
- Haverhill4 prefixes, 4%
- Ashby3 prefixes, 3%
- Gloucester3 prefixes, 3%
Also served: Wilmington, Salem, Beverly and Fitchburg and 45 smaller places.
Of the carriers named here, Fractel and T-Mobile hold the most phone number prefixes in area code 351, 11 prefixes each.
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 91 prefixes in use in 351 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| Fractel | 11 | 12% |
| T-MobileMobile network | 11 | 12% |
| Ton80 Communications | 7 | 8% |
| BandwidthSupplies numbers to VoIP and app-based phone services | 3 | 3% |
| Metro by T-MobileT-Mobile's prepaid brand | 3 | 3% |
| Peerless NetworkWholesale phone carrier | 3 | 3% |
| 14 other carriers | 53 | 58% |
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.
351 started in 2001 as an overlay on 978, and its ground has not changed since.
2001
351 starts on May 2, 2001, as an overlay on 978: new numbers on the same ground.
A 351 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 351 are 617, 781 and 508.
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 351.
Where is area code 351?
351 covers Lowell, Lawrence, Billerica and Concord and 53 more places in Massachusetts. In the 351 area, phone numbers are given out most in Essex County, then Middlesex and Worcester counties.
What state is area code 351 in?
Massachusetts. 351 is a Massachusetts area code on Eastern Time.
What cities use area code 351?
The places holding the most 351 prefixes are Lowell, Lawrence, Billerica, Concord, Peabody, Andover, Danvers and Haverhill, out of 57 places in all. The count comes from NANPA's prefix assignments as of October 1, 2026.
Which phone company owns area code 351?
No single phone company owns 351. NANPA's records list its 91 prefixes across many carriers, and the ones named on this page include Fractel and T-Mobile. Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 351 in?
351 is on Eastern Time.
When did area code 351 start?
351 went into service on May 2, 2001, as an overlay on 978: new numbers for the same area.
Is 351 the same area as 978?
Yes. 978 (since 1997) covers the same ground as 351. 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 351 number?
Local calls need all 10 digits: 351-555-0142.
Is 351 a toll-free number?
No. 351 is a regular area code for Lowell and Lawrence 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 351?
The closest are 617/857 (Boston, Massachusetts), 781/339 (Waltham, Massachusetts), 508/774 (Worcester, Massachusetts) and 413 (Springfield, Massachusetts), measured between the centres of each area.
Who called me from a 351 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 351 a scam?
351 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.