857 Area Code
The 857 area code covers Boston and several surrounding communities in Massachusetts.
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City Data
The 857 area code covers Boston and several surrounding communities in Massachusetts.
Federal Data
State Data
County Data
City Data
The 857 area code covers the same geographic area as area code 617, encompassing the city of Boston and several surrounding communities in Massachusetts.
Area code 857 is an overlay of area code 617. Area code 617 was created in October 1947. Area code 857 was overlaid onto 617 on May 2, 2001. Since then, 10-digit local dialing has been mandatory.
Area code 857 is a general purpose code which was placed in service on May 2, 2001.
Our Massachusetts phone number lookup service will analyze the three-digit prefix of any 857 area code phone number and will show which telecommunications company and rate center it was initially assigned to. This prefix code data may help to determine the U.S. carrier, Massachusetts geographic region, and local calling area associated with the phone number.
Phone numbers follow the following structure under the North American Numbering Plan:
Understanding the area code can help you determine if a call is local to your area. However, keep in mind that due to mobile number portability and VoIP services, the caller may be anywhere in the United States, so it’s best to search for the most recent phone number details.
| Company | Number of Prefixes |
|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 24 |
| OMNIPOINT MIAMI E LICENSE, LLC | 20 |
| SPRINT SPECTRUM, L.P. | 10 |
| METROPCS, INC. | 8 |
| VERIZON NEW ENGLAND INC. | 8 |
| NEW CINGULAR WIRELESS PCS, LLC - DC | 6 |
| BANDWIDTH.COM CLEC, LLC - MA | 5 |
| BROADVIEW NETWORKS, INC. - MA | 5 |
| LEVEL 3 COMMUNICATIONS, LLC - MA | 4 |
| XO MASSACHUSETS, INC. | 4 |
| ONVOY, LLC - MA | 3 |
| PAETEC COMMUNICATIONS, INC. - MA | 3 |
| COMCAST IP PHONE, LLC | 2 |
| CTC COMMUNICATIONS CORP. - MA | 2 |
| PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA | 2 |
| TC SYSTEMS, INC. | 2 |
| BARR TELL USA, INC. - MA | 1 |
| CENTURYLINK COMMUNICATIONS, LLC | 1 |
| COMMIO, LLC | 1 |
| DSCI, LLC | 1 |
| LOCAL ACCESS LLC - MA | 1 |
| METROPOLITAN TELECOMMUNICATIONS OF MASS DBA METTEL | 1 |
| MOSAIC NETWORX LLC - MA | 1 |
| NUSO, LLC | 1 |
| RCLEC, INC. | 1 |
| TELENGY LLC | 1 |
| VONAGE AMERICA LLC | 1 |
| WIDE VOICE, LLC - MA | 1 |
Carrier names have been updated from their original FCC assignments to reflect current companies following mergers, acquisitions, and rebranding. Updates were determined using AI-assisted research and may not be accurate or reflect up to date changes. This data is provided without warranties of accuracy or completeness.
| Rate Center | Number of Prefixes |
|---|---|
| BOSTON | 72 |
| CAMBRIDGE | 12 |
| BROOKLINE | 6 |
| BRIGHTON | 4 |
| DORCHESTER | 4 |
| JAMAICA PL | 4 |
| ROXBURY | 4 |
| NEWTON | 3 |
| CHARLESTN | 2 |
| QUINCY | 2 |
| WATERTOWN | 2 |
| BELMONT | 1 |
| CHELSEA | 1 |
| HYDE PARK | 1 |
| MILTON | 1 |
| SO BOSTON | 1 |
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