Boston Area Code: All 8 Codes (617, 857, 781, 339, 508, 774, 978, 351) Guide (2026)
Complete guide to all Boston area codes — 617, 857, 781, 339, 508, 774, 978, and 351. Learn which codes serve Greater Boston, their history, time zone, and how to identify scam calls from Boston numbers.
The Boston area code isn't one code — it's eight. Greater Boston is served by area codes 617, 857, 781, 339, 508, 774, 978, and 351, organized into four overlay pairs covering central Boston, the Route 128 suburbs, southeastern Massachusetts, and the Merrimack Valley. With approximately 4.9 million people in the metro area, Boston needed four separate splits and four overlays to keep up with demand.
Quick Facts
- State: Massachusetts
- City: Boston (24th largest in US)
- Area Codes: 617, 857, 781, 339, 508, 774, 978, 351
- Time Zone: Eastern Time (ET)
- Metro Population: ~4.9 million
- Original Code: 617 (1947)
- Dialing: 10-digit mandatory
Is a Boston Area Code a Scam?
Boston area codes (617, 857, 781, 339, 508, 774, 978, 351) are legitimate codes serving approximately 4.9 million people. However, like all major metro areas, Boston numbers are frequently spoofed by scammers. Use our Spam Number Checker to check suspicious numbers.
How to Call Boston Internationally
Dial exit code + 1 + Boston area code (617/857/781/339/508/774/978/351) + 7-digit number. On mobile: +1-617-XXX-XXXX. Use Best Time to Call for Eastern Time info. Look up any code with our Area Code Lookup. Check our rates.
Related Guides
Ready to Start Calling?
Make international calls from your browser with BubblyPhone. No app needed, instant setup.
Get Started Free →