Caller ID for
Area code 781
Area code 781 Waltham, Massachusetts
Area code 781 is in Massachusetts, with numbers assigned in Waltham, Lexington, Burlington and 28 more places. It’s 12:12 AM there now.
- State
- Massachusetts9 area codes in Massachusetts
- Time zone
- Eastern12:12 AM there now
- Exchanges
- 76931 places
- Overlay
- 339Same area, 10-digit dialing
- No sign-up
- We never contact the number
- Spam risk included
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Where area code 781 is
Numbers in 781 are assigned to 31 places in 5 counties: Middlesex County, Norfolk County, Essex County, Plymouth County and Suffolk County.
No single place dominates: Waltham, the largest, has 9% of the exchanges.
- Waltham72
- Lexington56
- Burlington41
- Lynn38
- Woburn38
- Dedham35
- Needham33
- Braintree Town31
- Medford24
- Norwood24
- Weymouth Town24
- Malden22
- Wakefield20
- Randolph Town19
- Winchester18
- Wellesley18
- Revere17
- Reading16
- Hingham16
- Arlington15
- Saugus14
- Stoneham14
- Kingston13
- Melrose11
Phone companies in 781
769 blocks of numbers in 781 are held by 26 phone companies. The most belong to Verizon (225), Verizon Business (92) and T-Mobile (75).
A large share, about 49%, belongs to competitive and internet phone carriers; wireless networks hold 17% and local phone and cable companies 34%.
A block’s holder is the company it was first assigned to; numbers can move to other carriers since.
History and overlays
781 went into service in 1997, added to the area of 617.
339 (since 2001) shares the same area, so a new number there can get any of these codes and local calls are dialed with all 10 digits.
18 new exchanges were assigned since 2021, the latest in March 2026.
Calling 781
It’s 12:12 AM Eastern time in 781 right now.
From elsewhere in the U.S., dial 1, 781 and the 7-digit number; inside the area, all 10 digits too.
Nearby area codes
Massachusetts has 9 area codes: 339, 351, 413, 508, 617, 774, 781, 857 and 978.
- 617 · Boston, MA · same area
- 857 · Boston, MA · same area
- 978 · Lowell, MA · about 17 mi
- 351 · Lowell, MA · about 19 mi
- 508 · Worcester, MA · about 23 mi
- 774 · Worcester, MA · about 26 mi
From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.
Map of the 781 area code
Map of the 781 area code around Waltham, Lexington and Burlington, Massachusetts.
Cities on the map
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Questions about 781
Where is area code 781?
In Massachusetts, covering Waltham, Lexington and Burlington and other places across 5 counties.
What time zone is 781 in?
Eastern time. It was 12:12 AM there when this page loaded.
Is 781 an overlay?
Yes. 339 serves the same area, so dial all 10 digits for local calls.
Which phone companies have 781 numbers?
26 companies hold blocks; the most belong to Verizon, Verizon Business and T-Mobile. About 17% of blocks are wireless.
Is 781 running out of numbers?
Not on record. 18 new exchanges have been assigned since 2021.