Suffolk County · Massachusetts
Boston, MA area codes and time zone
Quick answer
Boston is served by area codes 339, 351, 508, 617, 774, 781, 857, 978, keeps EST time (GMT-5), and sits in county FIPS 25025.
- Area codes
- 339 · 351 · 508 · 617 · 774 · 781 · 857 · 978Within 25 miles of the city centre
- Time zone
- ESTAmerica/New_York
- UTC offset
- GMT-5EDT in summer (UTCGMT-4)
- County FIPS
- 25025Suffolk County
Dialling from and to Boston
What this means when you pick up the phone.
Because more than one code covers this area, ten-digit dialling applies for local calls: area code plus number, every time. From abroad, dial +1 then the ten digits.
How Boston came to have several area codes
Why one city can carry several codes.
Area codes are assigned to geography, then exhausted as demand grows. Boston — population about 654k — is covered by codes 339, 351, 508, 617, 774, 781, 857, 978, drawn from within 25 miles of the city centre. Because these 8 codes serve the same footprint, they are overlays: the number pool ran low and a new code was layered on top rather than splitting the city apart. All ten digits are required for every local call.
More Boston data
Other Boston datasets on this site.
- Boston population and income
- Boston sales tax rate
- Boston property tax
- Boston cost of living
- Boston home values and rent
- Boston crime rates
- Boston public schools
- Boston weather normals
- Boston commute times
Statewide: Massachusetts cities · Massachusetts ZIP codes · Massachusetts sales tax · Massachusetts counties