Massachusetts, United States
Eastern Time
1:23 AM
Area Code
857
State / Province
Massachusetts
Country
United States
Time Zone
Eastern Time
Area code 857 covers 20 cities and communities across Massachusetts, based on telephone company rate center data.
Use the E.164 format for clickable phone links (RFC 3966):
<a href="tel:+18575550100">+18575550100</a><a href="tel:+18575550199">+18575550199</a>Look up which exchange in Massachusetts a specific 857 number is homed to, and whether its block is wireline or wireless. See what a reverse lookup can establish before relying on the answer.
365 active prefixes in this area code, assigned as 3,824 thousands-blocks — pooling splits one prefix across several carriers, so each block is listed separately with the rate centre it is homed to, its carrier of record, and the switch that serves it.
Showing blocks 1–100 of 3,824
| NPA-NXX | Block | Rate centre | Type | Carrier (OCN) | Switch | LATA | LIR | Dates |
|---|---|---|---|---|---|---|---|---|
| 857-200 | 0 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-200 | 1 | Boston | Landline or VoIP | METROPCS, INC. (5562) | NORTON | 128 | — | — |
| 857-200 | 2 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-200 | 3 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-200 | 4 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-200 | 5 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-200 | 6 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-200 | 7 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-200 | 8 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-200 | 9 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-200 | A | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-201 | 0 | Winthrop | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MA (990E) | BSTNMABLOMD | 128 | — | — |
| 857-201 | 1 | Winthrop | Landline or VoIP | METROPCS, INC. (5562) | NORTON | 128 | — | — |
| 857-201 | 2 | Winthrop | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MA (990E) | BSTNMABLOMD | 128 | — | — |
| 857-201 | 3 | Winthrop | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MA (990E) | BSTNMABLOMD | 128 | — | — |
| 857-201 | 4 | Winthrop | Landline or VoIP | TELNYX LLC (073H) | BSTPMALLOMD | 128 | — | — |
| 857-201 | 5 | Winthrop | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MA (990E) | BSTNMABLOMD | 128 | — | — |
| 857-201 | 6 | Winthrop | Landline or VoIP | METROPCS, INC. (5562) | NORTON | 128 | — | — |
| 857-201 | 7 | Winthrop | Landline or VoIP | CENTURYLINK COMMUNICATIONS, LLC (508J) | BSTPMALL5MD | 128 | — | — |
| 857-201 | 8 | Winthrop | Landline or VoIP | IP HORIZON LLC (515J) | — | 128 | — | — |
| 857-201 | 9 | Winthrop | Landline or VoIP | METROPCS, INC. (5562) | NORTON | 128 | — | — |
| 857-201 | A | Winthrop | Landline or VoIP | METROPCS, INC. (5562) | NORTON | 128 | — | — |
| 857-202 | 0 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-202 | 1 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-202 | 2 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-202 | 3 | Boston | Landline or VoIP | MCIMETRO ACCESS TRANSMISSION SERVICES LLC (7229) | CHARLTON | 128 | — | — |
| 857-202 | 4 | Boston | Landline or VoIP | MCIMETRO ACCESS TRANSMISSION SERVICES LLC (7229) | CHARLTON | 128 | — | — |
| 857-202 | 5 | Boston | Landline or VoIP | MCIMETRO ACCESS TRANSMISSION SERVICES LLC (7229) | CHARLTON | 128 | — | — |
| 857-202 | 6 | Boston | Landline or VoIP | MCIMETRO ACCESS TRANSMISSION SERVICES LLC (7229) | CHARLTON | 128 | — | — |
| 857-202 | 7 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-202 | 8 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-202 | 9 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-202 | A | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-203 | 0 | Jamaica Plain | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MA (990E) | BSTNMABLOMD | 128 | — | — |
| 857-203 | 1 | Jamaica Plain | Wireless | NEW CINGULAR WIRELESS PCS, LLC - DC (4036) | CMBSMA01AMD | 128 | — | — |
| 857-203 | 2 | Jamaica Plain | Wireless | NEW CINGULAR WIRELESS PCS, LLC - DC (4036) | CMBSMA01AMD | 128 | — | — |
| 857-203 | 3 | Jamaica Plain | Landline | VERIZON NEW ENGLAND INC. (9102) | WEST ROXBURY | 128 | — | — |
| 857-203 | 4 | Jamaica Plain | Landline | VERIZON NEW ENGLAND INC. (9102) | WEST ROXBURY | 128 | — | — |
| 857-203 | 5 | Jamaica Plain | Landline | VERIZON NEW ENGLAND INC. (9102) | WEST ROXBURY | 128 | — | — |
| 857-203 | 6 | Jamaica Plain | Landline | VERIZON NEW ENGLAND INC. (9102) | WEST ROXBURY | 128 | — | — |
| 857-203 | 7 | Jamaica Plain | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MA (990E) | BSTNMABLOMD | 128 | — | — |
| 857-203 | 8 | Jamaica Plain | Landline or VoIP | ONVOY, LLC - MA (892D) | BOSTON | 128 | — | — |
| 857-203 | 9 | Jamaica Plain | Landline or VoIP | COMCAST IP PHONE, LLC (318J) | NWTNMAWAVMD | 128 | — | — |
| 857-203 | A | Jamaica Plain | Landline | VERIZON NEW ENGLAND INC. (9102) | WEST ROXBURY | 128 | — | — |
| 857-204 | 0 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-204 | 1 | Boston | Landline or VoIP | PAETEC ITEL, LLC (829J) | BRTNMACOX2X | 128 | — | — |
| 857-204 | 2 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-204 | 3 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-204 | 4 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-204 | 5 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-204 | 6 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-204 | 7 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-204 | 8 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-204 | 9 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-204 | A | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-205 | A | Boston | Wireless | NEW CINGULAR WIRELESS PCS, LLC - DC (4036) | CMBSMA01AMD | 128 | — | — |
| 857-206 | 0 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-206 | 1 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-206 | 2 | Boston | Wireless | NEW CINGULAR WIRELESS PCS, LLC - DC (4036) | CMBSMA01AMD | 128 | — | — |
| 857-206 | 3 | Boston | Wireless | NEW CINGULAR WIRELESS PCS, LLC - DC (4036) | CMBSMA01AMD | 128 | — | — |
| 857-206 | 4 | Boston | Wireless | NEW CINGULAR WIRELESS PCS, LLC - DC (4036) | CMBSMA01AMD | 128 | — | — |
| 857-206 | 5 | Boston | Wireless | NEW CINGULAR WIRELESS PCS, LLC - DC (4036) | CMBSMA01AMD | 128 | — | — |
| 857-206 | 6 | Boston | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MA (990E) | BSTNMABLOMD | 128 | — | — |
| 857-206 | 7 | Boston | Landline or VoIP | PAETEC ITEL, LLC (829J) | BRTNMACOX5X | 128 | — | — |
| 857-206 | 8 | Boston | Landline or VoIP | PAETEC ITEL, LLC (829J) | BRTNMACOX2X | 128 | — | — |
| 857-206 | 9 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-206 | A | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-207 | 0 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-207 | 1 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-207 | 2 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-207 | 3 | Boston | Landline or VoIP | MCIMETRO ACCESS TRANSMISSION SERVICES LLC (7229) | CHARLTON | 128 | — | — |
| 857-207 | 4 | Boston | Landline or VoIP | MCIMETRO ACCESS TRANSMISSION SERVICES LLC (7229) | CHARLTON | 128 | — | — |
| 857-207 | 5 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-207 | 6 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-207 | 7 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-207 | 8 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-207 | 9 | Boston | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-207 | A | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-208 | 0 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-208 | 1 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-208 | 2 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-208 | 3 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-208 | 4 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-208 | 5 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-208 | 6 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-208 | 7 | Boston | Landline or VoIP | IP HORIZON LLC (515J) | — | 128 | — | — |
| 857-208 | 8 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-208 | 9 | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-208 | A | Boston | Wireless | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA (6387) | CATNMAAKAMD | 128 | — | — |
| 857-209 | 0 | Cambridge | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MA (990E) | BSTNMABLOMD | 128 | — | — |
| 857-209 | 1 | Cambridge | Wireless | NEW CINGULAR WIRELESS PCS, LLC - DC (4036) | CMBSMA01AMD | 128 | — | — |
| 857-209 | 2 | Cambridge | Landline or VoIP | PAETEC ITEL, LLC (829J) | BRTNMACOX2X | 128 | — | — |
| 857-209 | 3 | Cambridge | Landline or VoIP | PAETEC ITEL, LLC (829J) | BRTNMACOX5X | 128 | — | — |
| 857-209 | 4 | Cambridge | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MA (990E) | BSTNMABLOMD | 128 | — | — |
| 857-209 | 5 | Cambridge | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - MA (4018) | CAMBRIDGE | 128 | — | — |
| 857-209 | 6 | Cambridge | Wireless | OMNIPOINT MIAMI E LICENSE, LLC (6889) | NORTON | 128 | — | — |
| 857-209 | 7 | Cambridge | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MA (990E) | BSTNMABLOMD | 128 | — | — |
| 857-209 | 8 | Cambridge | Landline or VoIP | BANDWIDTH.COM CLEC, LLC - MA (990E) | BSTNMABLOMD | 128 | — | — |
| 857-209 | 9 | Cambridge | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - MA (4018) | CAMBRIDGE | 128 | — | — |
| 857-209 | A | Cambridge | Landline or VoIP | LEVEL 3 COMMUNICATIONS, LLC - MA (4018) | CAMBRIDGE | 128 | — | — |
Block-level assignments from the North American Numbering Plan administrator, via localcallingguide.com.
Assigned Prefixes
365
Assignment Blocks
3,824
Rate Centers
20
Carriers of Record
51
| Type | Blocks | Share |
|---|---|---|
| Landline | 101 | 3% |
| Landline or VoIP | 2,117 | 55% |
| Wireless | 1,605 | 42% |
| Unknown | 1 | 0% |
| Carrier | Blocks |
|---|---|
| ONVOY, LLC - MA | 667 |
| OMNIPOINT MIAMI E LICENSE, LLC | 662 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 617 |
| METROPCS, INC. | 273 |
| NEW CINGULAR WIRELESS PCS, LLC - DC | 201 |
| BANDWIDTH.COM CLEC, LLC - MA | 197 |
| PAETEC ITEL, LLC | 173 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 111 |
| ONVOY SPECTRUM, LLC | 111 |
| LEVEL 3 COMMUNICATIONS, LLC - MA | 103 |
| 41 other carriers | 709 |
Carrier of record for each block. Numbers ported to another carrier keep their original block assignment, so this is not a lookup of who serves a given number today.
| Rate Center | Prefixes | Blocks |
|---|---|---|
| Boston | 154 | 1,603 |
| Cambridge | 29 | 294 |
| Brookline | 27 | 287 |
| Roxbury | 20 | 220 |
| Newton | 18 | 198 |
| Brighton | 14 | 143 |
| Quincy | 14 | 154 |
| Dorchester | 13 | 140 |
| Charlestown | 10 | 104 |
| Jamaica Plain | 9 | 96 |
| Somerville | 8 | 81 |
| Belmont | 7 | 73 |
| East Boston | 7 | 77 |
| South Boston | 6 | 55 |
| Watertown | 6 | 63 |
| Winthrop | 6 | 58 |
| Hyde Park | 5 | 50 |
| Chelsea | 4 | 41 |
| Everett | 4 | 43 |
| Milton | 4 | 44 |
A rate center is the telephone exchange area a number is homed to. It sets local calling boundaries, and is not the caller's current location.
Area code 857 is a North American Numbering Plan (NANP) telephone area code assigned to Massachusetts, United States. It is one of 9 area codes serving Massachusetts. As population and demand for phone numbers grew, the region was divided into multiple numbering plan areas to avoid exhausting the available 7-digit number pool.
Yes. 857 is an active North American Numbering Plan (NANP) area code, currently assigned to Massachusetts, United States. It is safe to answer or dial calls using this area code.
Area code 857 covers 20 cities and communities in Massachusetts, including Belmont, Boston, Brighton, Brookline, Cambridge, and 15 more localities. This is based on telephone company rate center data — the geographic areas carriers use to determine local calling boundaries and to assign numbers when a business or individual requests a phone number in a specific city.
All numbers in the 857 area code observe Eastern Time (IANA timezone: America/New_York). Eastern Time is UTC−5 in winter (EST) and UTC−4 in summer (EDT). When placing a call to a 857 number from a different time zone, check the current local time above to avoid calling outside of business hours.
From within Massachusetts, dial the 7-digit local number directly if calling within the same rate center, or dial 1 + 857 + 7-digit number for long-distance calls within North America. From outside the US or Canada, dial your country's international exit code followed by 1 857 XXX XXXX. The country code for both the United States and Canada in NANP is +1.
Format 857 numbers using E.164 notation as required by RFC 3966: prefix with +1 and omit dashes and parentheses (e.g., +18575550100). This format ensures tel: links work correctly on all mobile browsers and VoIP apps. See the tel: URI formatting guide for complete examples.