Massachusetts Area Codes
9 active area codes · Boston · Population around 7,138,560
Massachusetts has 9 active area codes, serving cities like Boston, Worcester, and Springfield. Of those, 8 are overlays covering ground another code already covers, which is why local calls there use all ten digits. The newest — 339, 351, 774, and 857 — have been in service since May 2, 2001. Each code below links to its cities, carriers, timezone, and coverage map.
Massachusetts Area Code Map
What area codes does Massachusetts have?
- 339OverlayBostonEastern Time (ET) · 44 cities · 1,328,336
- 351OverlayLowellEastern Time (ET) · 45 cities · 1,372,258
- 413SpringfieldEastern Time (ET) · 41 cities · 825,888
- 508OverlayWorcesterEastern Time (ET) · 103 cities · 2,155,082
- 617OverlayBostonEastern Time (ET) · 12 cities · 1,325,195
- 774OverlayWorcesterEastern Time (ET) · 103 cities · 2,155,082
- 781OverlayBostonEastern Time (ET) · 44 cities · 1,328,336
- 857OverlayBostonEastern Time (ET) · 12 cities · 1,325,195
- 978OverlayLowellEastern Time (ET) · 45 cities · 1,372,258
More than one of these codes covers 11 of the 14 counties in Massachusetts, and one county is covered by 8 of them. Each card counts the people inside that code's own boundary at the 2020 census. Adding all 9 gives 13,187,630, against the 7,029,917 the same census counts in those counties, because 6,157,713 residents fall inside more than one code.
Which cities are the largest in Massachusetts?
How many phone prefixes does Massachusetts use?
The area codes in Massachusetts hold 4,618 assigned prefixes between them, listed under 77 distinct carrier names. A prefix is the three digits after the area code, and NANPA assigns each one to a single carrier.
Sources: City populations – U.S. Census Bureau PEP, Vintage 2024 (SUB-IP-EST2024-POP). State populations – the same program, Vintage 2025 (CO-EST2025-ALLDATA). Area-code footprint and county populations – 2020 Census Centers of Population, mapped against NANP area code boundaries. The share of each city inside a code is measured the same way, against Census place boundaries from the Census Bureau's TIGERweb service. Area code assignments – NANPA CO Code data. See our data methodology.
Frequently Asked Questions
How many area codes does Massachusetts have?
Massachusetts has 9 active area codes: 339, 351, 413, 508, 617, 774, 781, 857, 978.
What is the main area code for Massachusetts?
Of the 9 area codes in Massachusetts, 617 is the oldest one still serving Boston, its largest city. 617 has been in service since 1947.
What are the largest cities in Massachusetts?
The largest cities in Massachusetts include Boston, Worcester, Springfield, Cambridge, Lowell.
What is the total population of Massachusetts?
Massachusetts has an estimated total population of 7,138,560 based on US Census PEP 2024 data.
Do I have to dial ten digits in Massachusetts?
In the parts of Massachusetts covered by an overlay, yes. 8 of the 9 area codes here cover ground another code already covers, and where two codes share an area, local calls need the area code as well as the seven-digit number.
Why does Massachusetts have 9 area codes?
They arrived one at a time rather than all at once: 617 has been in service since 1947. 8 of the 9 are overlays, laid over a code that already covered the same ground instead of splitting its map in two. The most recent are 339, 351, 774, and 857, in service since May 2, 2001.
What is the newest area code in Massachusetts?
339, 351, 774, and 857 share the title: all 4 went into service on May 2, 2001.
Is my county covered by more than one area code in Massachusetts?
It may be: more than one area code covers 11 of the 14 counties in Massachusetts, and one county there is covered by 8 of them. The table above shows which codes reach each of the largest cities.