Cities in area code 617

27 localities · NANPA data, current as of July 28, 2026.

Area code 617 serves 27 localities in Massachusetts, led by Boston, Cambridge, Newton. The table lists every rate center — the billing locality each prefix is anchored to — with its share of the code's 768 active prefixes.

By numbering footprint the leading localities are Boston, Cambridge, Newton, Quincy, Brookline, Brighton, Dorchester and Somerville, and 18 smaller communities down to single-prefix localities. Prefix counts track lines in service, so the ranking is a reasonable proxy for where the code's subscribers actually are.

Metropolitan coverage: 27 rate centers belong to FCC top-100 metro areas.

Overlap note: 27 localities are shared with other area codes, so a neighbor's number may differ in its first three digits.

Clock-wise the coverage is Eastern.

A caller's real location can differ: numbers port between carriers and follow their owners when they move. Use the prefix tables to see where a specific number block was issued.

Showing 27 of 27
Rate centers covered by area code 617
Locality (rate center) Active prefixes Metro area All codes serving it
Boston 274 Boston-Cambridge-Newton, MA-NH 617, 857
Cambridge 111 Boston-Cambridge-Newton, MA-NH 508, 617, 857
Newton 48 Boston-Cambridge-Newton, MA-NH 617, 857
Quincy 44 Boston-Cambridge-Newton, MA-NH 617, 857
Brookline 38 Boston-Cambridge-Newton, MA-NH 617, 857
Brighton 22 Boston-Cambridge-Newton, MA-NH 617, 857
Dorchester 22 Boston-Cambridge-Newton, MA-NH 617, 857
Somerville 21 Boston-Cambridge-Newton, MA-NH 617, 857
Jamaica Plain 18 Boston-Cambridge-Newton, MA-NH 617, 857
Milton 17 Boston-Cambridge-Newton, MA-NH 617, 857
Roxbury 16 Boston-Cambridge-Newton, MA-NH 617, 857
Everett 15 Boston-Cambridge-Newton, MA-NH 617, 857
Watertown 15 Boston-Cambridge-Newton, MA-NH 617, 857
East Boston 15 Boston-Cambridge-Newton, MA-NH 617, 857
Hyde Park 14 Boston-Cambridge-Newton, MA-NH 617, 857
Charlestown 13 Boston-Cambridge-Newton, MA-NH 617, 857
South Boston 13 Boston-Cambridge-Newton, MA-NH 617, 857
Chelsea 12 Boston-Cambridge-Newton, MA-NH 617, 857
Belmont 10 Boston-Cambridge-Newton, MA-NH 617, 857
Waltham 9 Boston-Cambridge-Newton, MA-NH 339, 617, 781
Saugus 7 Boston-Cambridge-Newton, MA-NH 339, 617, 781
Winthrop 5 Boston-Cambridge-Newton, MA-NH 617, 857
Dedham 4 Boston-Cambridge-Newton, MA-NH 339, 617, 781
Malden 2 Boston-Cambridge-Newton, MA-NH 339, 617, 781
Kingston 1 Boston-Cambridge-Newton, MA-NH 339, 617, 781
Weymouth 1 Boston-Cambridge-Newton, MA-NH 339, 617, 781
Melrose 1 Boston-Cambridge-Newton, MA-NH 339, 617, 781

FAQ

What is the biggest city in area code 617?

Boston holds the most active prefixes (274), making it the code's largest numbering locality.

How many places does 617 cover?

27 rate centers in Massachusetts hold active 617 prefixes, from Boston down to communities with a single prefix.

Does a 617 number guarantee the caller lives in one of these places?

No — the tables show where number blocks were issued. Porting and VoIP let people keep or acquire numbers anywhere.

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