Area code 781
Area code 781 serves Waltham and nearby parts of Massachusetts, including Lynn, Woburn and Weymouth. It is on Eastern Time, which observes daylight saving time. 339 is an overlay for the same area.
Area code 781 at a glance
| State | Massachusetts (MA) |
| Main city | Waltham |
| Time zone | Eastern Time |
| UTC offset | UTC−5 in winter, UTC−4 in summer |
| Daylight saving time | Yes |
| Overlay codes | 339 |
Cities in 781
- Waltham
- Lynn
- Woburn
- Weymouth
An area code shows where a number was first assigned. Mobile numbers keep their area code when people move, so the person you’re calling may be somewhere else.
When you can call a 781 number
Federal telemarketing rules under the TCPA allow sales calls between 8 AM and 9 PM in the called person’s local time. Here is that window for a 781 number, shown in your own time zone.
General information, not legal advice. Some states add rules for Sundays, holidays or the number of calls. See our calling hours guide.
| If you’re on | You can call 781 between |
|---|---|
| Eastern | 8:00 AM to 9:00 PM |
| Central | 7:00 AM to 8:00 PM |
| Mountain | 6:00 AM to 7:00 PM |
| Arizona | 5:00 AM to 6:00 PM |
| Pacific | 5:00 AM to 6:00 PM |
See the time in 781 without leaving your CRM
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Other area codes in Massachusetts
Questions about 781
What time zone is area code 781?
Area code 781 is on Eastern Time. It observes daylight saving time.
Where is area code 781?
Area code 781 is in Massachusetts. Its main city is Waltham, and it also covers Lynn, Woburn and Weymouth.
What are the legal hours to call a 781 number?
Under the federal TCPA, sales calls are allowed from 8 AM to 9 PM in the called person’s local time. Personal and informational calls are not limited by these hours.
What area codes overlay 781?
339 covers the same area as 781, so numbers in the same town can have either code.