351 area code
Acton area, Eastern Time.Area code 351 covers Acton, Lowell, Lawrence and 55 more places in Massachusetts, on Eastern Time. 978 covers the same area.
Right now in Acton
Eastern Time (EST, UTC-5; EDT, UTC-4 in summer)
Calling hours: Every day, 8 AM to 8 PM (Massachusetts law)
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Where 351 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 351 has 58. Each one's share is how many 351 numbers start there. Its biggest metro area is Boston-Cambridge-Newton, MA-NH.
- Acton7%
- Lowell6%
- Lawrence4%
- Danvers4%
- Haverhill4%
- Georgetown4%
- Peabody3%
- Gloucester3%
- Ipswich3%
- Harvard3%
- Ashby3%
- Merrimac3%
Also: Leominster, Westford, Hudson, Templeton, Amesbury, Hamilton, Tyngsboro, Orange, Manchester, Pepperell, Rockport, Lunenburg + 34 more
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 351 number?
Sales calls to homes and cell phones have legal hours, set by Massachusetts law. Hold every 351 number to them, since you can't tell a work line from a personal cell.
What applies to 351Every day, 8 AM to 8 PM
- Federal (TCPA and FTC rule)Every day, 8 AM to 9 PMCalls to residential and mobile numbers. Most calls to businesses are exempt from the FTC's rule.47 CFR 64.1200(c)(1); 16 CFR 310.4(c) (opens in a new tab)
- Massachusetts lawEvery day, 8 AM to 8 PMM.G.L. c. 159C §3 (opens in a new tab)
Local time comes from the area code, not from where the person is today. Mobiles keep their number when they move. Calling hours here are a guide, not legal advice. Every state's calling hours, with sources
351 and 978
351 went into service on May 2, 2001. 351 and 978 cover the same area, so new numbers can get either code and neighbors can have different area codes. 351 holds 10% of the area's exchanges; 978 holds the most. Local calls take all 10 digits.
- 1997978 overlay
- 2001351 starts
Source: NANPA area code database
Calling a list of 351 numbers?
Paste it into the free phone number validator. It checks every number, finds each one's time zone and sorts the list by who you can call right now.
351 area code FAQ
What area code is 351?
351 is a Massachusetts area code for Acton, Lowell, Lawrence, Danvers and 54 more places.
What time zone is the 351 area code in?
Eastern Time (EST, UTC-5; EDT, UTC-4 in summer).
Is 978 the same as 351?
Same area, different code. 351 and 978 cover the same area (an overlay), so new numbers can get any of them and local calls take all 10 digits.
What are the calling hours for 351 numbers?
Every day, 8 AM to 8 PM, local time, under Massachusetts law.
When did the 351 area code start?
On May 2, 2001.
Calling 351 numbers? Reach more of them.
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