| District of Massachusetts area codes: 617 | |
|---|---|
| Country | United States |
| State/Province | Massachusetts |
| Major City | Boston |
| Time Zone | Eastern (UTC-05:00) |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 617-385 | Suffolk | Boston, MA | Teleport Communications America |
| 617-386 | Middlesex | Cambridge, MA | AT&T Local |
| 617-387 | Middlesex | Everett, MA | Verizon New England Inc. |
| 617-388 | Middlesex | Woburn, MA | Sprint Spectrum L.p. |
| 617-389 | Middlesex | Everett, MA | Verizon New England Inc. |
| 617-390 | Suffolk | Jamaica Plain, MA | Mcimetro Access Transmission Services LLC |
| 617-391 | Suffolk | Boston, MA | Ctc Communications Corp. |
| 617-392 | Suffolk | Boston, MA | Teleport Communications America |
| 617-393 | Middlesex | Watertown, MA | Rcn Telecom Services |
| 617-394 | Middlesex | Everett, MA | Verizon New England Inc. |
| 617-395 | Middlesex | Cambridge, MA | Broadwing Communications |
| 617-396 | Norfolk | Brookline, MA | Teleport Communications America |
| 617-397 | Middlesex | Cambridge, MA | AT&T Local |
| 617-398 | Suffolk | Charlestown, MA | AT&T Local |
| 617-399 | Suffolk | Boston, MA | Allegiance Telecom |
| 617-400 | Suffolk | Roxbury, MA | Norfolk County Internet |
| 617-401 | Middlesex | Cambridge, MA | Level 3 Communications |
| 617-402 | Middlesex | Watertown, MA | Local Access LLC |
| 617-403 | Suffolk | Brighton, MA | Verizon New England Inc. |
| 617-404 | Middlesex | Belmont, MA | Verizon New England Inc. |
There are 766 prefixes, In the code area, the major cities are Belmont, MA;Boston, MA;Brookline, MA;Cambridge, MA. The major city is Boston.