| District of Massachusetts area codes: 857 | |
|---|---|
| Country | United States |
| State/Province | Massachusetts |
| Major City | Boston |
| Time Zone | Eastern |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 857-498 | Suffolk | Brighton, MA | New Cingular Wireless PCS - DC |
| 857-499 | Norfolk | Quincy, MA | New Cingular Wireless PCS - DC |
| 857-500 | Middlesex | Bedford, MA | Cellco Partnership DBA Verizon Wireless |
| 857-523 | Middlesex | Somerville, MA | Cellco Partnership DBA Verizon Wireless |
| 857-524 | Suffolk | S Boston, MA | Allegiance Telecom |
| 857-526 | Norfolk | Quincy, MA | Sprint Spectrum L.p. |
| 857-540 | Suffolk | Brighton, MA | Sprint Spectrum L.p. |
| 857-544 | Suffolk | Roxbury, MA | Omnipoint Miami E License |
| 857-547 | Suffolk | Jamaica Plain, MA | Broadview Networks |
| 857-559 | Suffolk | Boston, MA | Allegiance Telecom |
| 857-574 | Suffolk | East Boston, MA | Ctc Communications Corp. |
| 857-576 | Norfolk | Brookline, MA | Local Access LLC |
| 857-588 | Suffolk | Charlestown, MA | Allegiance Telecom |
| 857-598 | Middlesex | Malden, MA | Xo Massachusetts |
| 857-600 | Suffolk | Cambridge, MA | Bandwidth.com Clec |
| 857-615 | Suffolk | Boston, MA | Metro PCS |
| 857-626 | Middlesex | Belmont, MA | Mci Worldcom Communications |
| 857-636 | Middlesex | Newton, MA | Cellco Partnership DBA Verizon Wireless |
| 857-654 | Suffolk | Boston, MA | Omnipoint Miami E License |
| 857-701 | Suffolk | Roxbury, MA | Omnipoint Miami E License |
There are 164 prefixes, In the code area, the major cities are Belmont, MA;Boston, MA;Brookline, MA;Cambridge, MA. The major city is Boston.