Area code 781 covers Waltham and surrounding communities in Massachusetts.
Updated 8 October 2026
Area code 781 is in Massachusetts, shown here with Waltham marked.
Now in Waltham
Eastern Time · UTC−5, UTC−4 in summer
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Eastern Time
Where you are—
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Typical business hours, 9 to 5 Monday to Friday.
Typical business hours, 9 to 5 Monday to Friday, shown as the blue arc. A guide to when a real Waltham office is likely to answer. It says nothing about who called you.
Source: North American Numbering Plan Administrator, retrieved 8 October 2026.
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Is area code 781 a scam?
No. Area code 781 is a legitimate area code serving Waltham since 1997. Scammers spoof caller ID to display 781 numbers, which is why complaints exist against a code that is itself genuine.
Neighbour spoofing is the reason a local-looking number is not a guarantee. A caller anywhere in the world can display a 781 number, and the number they display may belong to a real business in Waltham that has nothing to do with the call.
The callerAnywhere in the worldSets the caller ID their equipment sends.
What is displayed(781) 566-8000May belong to a real Waltham business.
Your phoneLooks localA nearby code and prefix make you likelier to answer.
416Area code 781 had 416 different numbers reported for spam calls in the 30 days to 8 October 2026.
200thArea code 781 ranks 200th of 331 US geographic area codes by spam complaint volume.
68%Of the 438 complaints about area code 781 in the 30 days to 8 October 2026, 68% were reported as a recorded message or robocall.
28%The most reported subject on area code 781 is reducing your debt (credit cards, mortgage, student loans), appearing in 28% of its complaints in the 30 days to 8 October 2026.
Why am I getting text messages from area code 781?
Texts from 781 numbers follow the same pattern as calls — mostly local businesses and services. Treat any text asking for payment or credentials as suspect regardless of the code.
The common patterns are a wrong-number opener that turns into conversation, an unsolicited job offer, and a crypto or investment tip. Do not reply, do not follow the link, and forward the message to 7726 (SPAM) to report it to your carrier.
Pattern 1Wrong-number openerTurns into conversation.
Pattern 2Unsolicited job offerDo not reply, do not follow the link.
Pattern 3Crypto or investment tipTreat any payment ask as suspect.
Report it7726Forward the message. It spells SPAM on a keypad.
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Area codes that overlay 781
Area code 781 shares its geographic footprint with one other code: 339. Overlays are laid over an existing area rather than splitting it, so all local calls require the full ten-digit number.
Area code 781 has covered the inner ring of Boston suburbs since 1997, and Waltham is a fair capital for it. Nine miles west of downtown Boston, Waltham was a prototype of the American factory town, birthplace of the Waltham Watch Company and the Waltham-Lowell system of industrial labor. Today the mills are offices and the economy runs on research, software, and biotech. Brandeis University and Bentley University anchor the city, and the Route 128 corridor that loops through the 781 region carries defense contractors like Raytheon, life science firms, and enough venture-backed companies that the highway was once called America's Technology Highway.
Who lives in the 781 region
Waltham counted 65,218 residents at the 2020 census, and the profile is what a university-and-lab economy produces: a median age of 34.4, a median household income of $120,216 in 2024, per Data USA, and about 26.2% of residents born outside the country. Spanish, Chinese, and Portuguese-speaking households are all present in meaningful numbers, the last reflecting the region's longstanding Brazilian and Portuguese communities. Graduate students, postdocs, and engineers cycle through the city constantly.
What a 781 number signals to a caller
Callers describe eastern Massachusetts phone culture as fast, credential-conscious, and allergic to filler. People expect you to know what you are talking about by the second sentence. A number in area code 781 reads as inner-suburb Boston to a customer in Waltham, Massachusetts, distinct from the city's 617 and the outer 508, and in a market where the area code maps loosely onto geography and industry, locals do the decoding automatically.
Area code 781 serves Waltham and surrounding communities in Massachusetts. It is in the Eastern Time zone.
What state is area code 781 in?
Area code 781 is in Massachusetts. It is not in New York or Fort Worth — those are area codes 718 and 817.
Is area code 781 toll free?
No. Area code 781 is a geographic area code serving Waltham, Massachusetts. The toll-free codes are 800, 833, 844, 855, 866, 877, 888, and a call to a 781 number is charged at your normal rate.
Why am I getting calls from 781?
Calls displaying a 781 number come from businesses and individuals in the Waltham area, and from anywhere at all when caller ID is spoofed to look local. 416 781 numbers were reported to the FTC in the 30 days to 8 October 2026.
How do I block calls from area code 781?
Both iOS and Android can silence calls from unknown numbers, and every major US carrier offers free call-blocking. Blocking the whole of area code 781 is rarely worth it, because spoofed numbers change constantly and you would lose legitimate calls from Waltham.