Massachusetts area codes

Codes in service in Massachusetts

Massachusetts has 9 geographic area codes in service: 339, 351, 413, 508, 617, 774, 781, 857, 978. 413 is the oldest, dated 1947, and 857 the newest, dated 2 May 2001.1 All of Massachusetts's codes are on Eastern time.

Area code	NANPA location	NPA in-service date	In-service overlay peers	Time zone	Local calls within the code
339	MA	2 May 2001	781	Eastern	10 digits
351	MA	2 May 2001	978	Eastern	10 digits
413	MA	1947	None listed	Eastern	7 digits
508	MA	16 Jul 1988	774	Eastern	10 digits
617	MA	1947	857	Eastern	10 digits
774	MA	2 May 2001	508	Eastern	10 digits
781	MA	1 Sep 1997	339	Eastern	10 digits
857	MA	2 May 2001	617	Eastern	10 digits
978	MA	1 Sep 1997	351	Eastern	10 digits

Scroll the table sideways to see every column. Sources: NANPA (14 October 2026 file).

History and overlays in Massachusetts

Before 1960: 413 (1947), 617 (1947)
1960 to 1989: 508 (16 Jul 1988)
1990s: 781 (1 Sep 1997), 978 (1 Sep 1997)
2000s: 339 (2 May 2001), 351 (2 May 2001), 774 (2 May 2001), 857 (2 May 2001)

Massachusetts's in-service overlay groups are 339/781; 351/978; 508/774; 617/857.1

617/857: 617 (1947) was joined by 857 on 2 May 2001.
508/774: 508 (1988) was joined by 774 on 2 May 2001.
339/781: 781 (1997) was joined by 339 on 2 May 2001.
351/978: 978 (1997) was joined by 351 on 2 May 2001.

Dialing in Massachusetts

Local calls within a single area code in Massachusetts differ: 7 digits for 413; 10 digits for 339, 351, 508, 617, 774, 781, 857, 978. From any of Massachusetts's codes, local calls to another area code are all recorded as 10 digits.1 Seven-digit local dialing is still recorded for 413.

Neighbours of Massachusetts

Regions that border Massachusetts:

Connecticut: 4 codes (203, 475, 860, 959)
New Hampshire: 1 code (603)
New York: 23 codes (212, 315, 329, 332, ...)
Rhode Island: 1 code (401)

Rules that apply to every region are on the area-code reference.

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Sources

Every regulatory and pricing claim on this page links to the primary source it came from. Figures were checked on the date shown at the top of the page; rules and prices change, so verify before relying on one.

NANPA, NPA Database CSV, file dated 14 October 2026; US geographic codes, location, dates, overlay complexes, dialing plan and time zone. Retrieved 14 Oct 2026
https://reports.nanpa.com/public/npa_report.csv