781 area code
Waltham area, Eastern Time.Area code 781 covers Waltham, Lexington, Burlington and 37 more places in Massachusetts, on Eastern Time. 339 covers the same area.
Right now in Waltham
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 781 numbers come from
Numbers are issued by rate center, a billing area named for its main town. 781 has 40. Each one's share is how many 781 numbers start there. Its biggest metro area is Boston-Cambridge-Newton, MA-NH.
- Waltham9%
- Lexington7%
- Burlington5%
- Lynn5%
- Woburn5%
- Dedham5%
- Needham4%
- Braintree4%
- Weymouth3%
- Medford3%
- Canton3%
- Norwood3%
Also: Malden, Wakefield, Randolph, Wellesley, Winchester, Revere, Rockland, Hingham, Reading, Arlington, Saugus, Stoneham + 16 more
Share of exchanges (blocks of 10,000 numbers). Source: NANPA rate center and exchange reports, November 10, 2026
When can you call a 781 number?
Sales calls to homes and cell phones have legal hours, set by Massachusetts law. Hold every 781 number to them, since you can't tell a work line from a personal cell.
What applies to 781Every 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
781 and 339
781 went into service on September 1, 1997, split off from 617. 781 and 339 cover the same area, so new numbers can get either code and neighbors can have different area codes. 781 holds 88% of the area's exchanges; 339 holds the rest. Local calls take all 10 digits.
- 1997781 starts
- 2001339 overlay
Source: NANPA area code database
Calling a list of 781 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.
781 area code FAQ
What area code is 781?
781 is a Massachusetts area code for Waltham, Lexington, Burlington, Lynn and 36 more places.
What time zone is the 781 area code in?
Eastern Time (EST, UTC-5; EDT, UTC-4 in summer).
Is 339 the same as 781?
Same area, different code. 781 and 339 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 781 numbers?
Every day, 8 AM to 8 PM, local time, under Massachusetts law.
When did the 781 area code start?
On September 1, 1997. It was split from 617.
Calling 781 numbers? Reach more of them.
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