857 Area Code: Location, Cities, Map And Time Zone
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© OpenStreetMap contributorsFor exact NPA boundaries see official 857 area code map
857-300-XXXX --- 857-399-XXXX
857-400-XXXX --- 857-499-XXXX
857-500-XXXX --- 857-598-XXXX
857-600-XXXX --- 857-693-XXXX
857-701-XXXX --- 857-799-XXXX
857-800-XXXX --- 857-895-XXXX
857-919-XXXX --- 857-999-XXXX
Area code 857 is in Massachusetts, USA , spanning 3 counties and serving 36 cities , including Boston, Newton or Somerville; it currently uses 358 prefixes , assigned from 857-200-XXXX through 857-999-XXXX.
In service since May 02, 2001, area code 857 is an overlay Numbering Plan Area, part of overlay complex 617/857.
The current local time is .
Phone number lookup
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More Massachusetts area codes:
- 339
- 351
- 413
- 508
- 617
- 774
- 781
- 978
Locate any 857-NXX prefix:
857-200-XXXX --- 857-299-XXXX| NPANXX | Carrier1 | Area Served2 | Date3 |
|---|---|---|---|
| 857-200 | Cellco Partnership | Boston | 1/10/2011 |
| 857-201 | MetroPCS | Winthrop | 10/28/2002 |
| 857-202 | Cellco Partnership | Boston | 11/10/2011 |
| 857-203 | Verizon New England | Jamaica Plain | 2/28/2005 |
| 857-204 | Omnipoint Miami E License | Boston | 3/20/2001 |
| 857-205 | New Cingular Wireless PCS | Boston | 3/19/2001 |
| 857-206 | Cellco Partnership | Boston | 10/7/2011 |
| 857-207 | Cellco Partnership | Boston | 4/11/2007 |
| 857-208 | Cellco Partnership | Boston | 2/8/2012 |
| 857-209 | Level 3 Communications | Cambridge | 10/11/2001 |
| 857-210 | Omnipoint Miami E License | Boston | 3/10/2011 |
| 857-212 | MetroPCS | Dorchester | 4/23/2001 |
| 857-213 | Paetec Itel | Boston | 10/3/2011 |
| 857-214 | Cellco Partnership | Boston | 12/6/2011 |
| 857-215 | Verizon New England | Brookline | 2/23/2010 |
| 857-216 | Ymax Communications Corp. | Newton | 11/3/2009 |
| 857-217 | MetroPCS | Dorchester | 6/29/2001 |
| 857-218 | Verizon New England | Brookline | 1/12/2007 |
| 857-219 | Onvoy | Newton | 2/16/2012 |
| 857-220 | Paetec Itel | Dorchester | 3/20/2001 |
| 857-221 | MetroPCS | Boston | 5/25/2005 |
| 857-222 | Omnipoint Miami E License | Boston | 5/17/2001 |
| 857-223 | Paetec Itel | Boston | N/A |
| 857-224 | Verizon New England | Boston | 12/17/2009 |
| 857-225 | Cellco Partnership | Brookline | 5/3/2001 |
| 857-226 | U.S. Telepacific Corp. | Newton | 3/30/2006 |
| 857-227 | MCIMetro Access Transmission Services | Somerville | 5/23/2001 |
| 857-228 | Paetec Itel | Watertown | 7/12/2001 |
| 857-229 | Paetec Itel | Newton | N/A |
| 857-230 | Omnipoint Miami E License | Roxbury | 4/15/2009 |
| 857-231 | MetroPCS | Newton | 7/30/2002 |
| 857-232 | Onvoy | Newton | 5/17/2006 |
| 857-233 | Omnipoint Miami E License | Boston | 2/16/2006 |
| 857-234 | Omnipoint Miami E License | Brookline | 3/18/2002 |
| 857-235 | Verizon New England | Cambridge | 11/18/2008 |
| 857-236 | MetroPCS | Boston | 8/4/2008 |
| 857-237 | MetroPCS | Boston | 6/8/2009 |
| 857-238 | Verizon New England | Boston | 11/14/2007 |
| 857-239 | Onvoy | Boston | N/A |
| 857-240 | Peerless Network Of Massachusetts | Newton | 2/28/2012 |
| 857-241 | Level 3 Communications | Boston | 10/24/2006 |
| 857-242 | U.S. Telepacific Corp. | Cambridge | 9/8/2011 |
| 857-243 | Onvoy | Boston | 11/5/2009 |
| 857-244 | Bandwidth.com Clec | Boston | 6/10/2008 |
| 857-245 | Ymax Communications Corp. | Brookline | 11/2/2006 |
| 857-246 | MetroPCS | Boston | N/A |
| 857-247 | MetroPCS | Boston | 6/8/2009 |
| 857-248 | Cellco Partnership | Boston | 3/8/2012 |
| 857-249 | MetroPCS | Boston | 8/4/2008 |
| 857-250 | Omnipoint Miami E License | Boston | 7/15/2011 |
| 857-251 | MetroPCS | Boston | 8/4/2008 |
| 857-252 | Paetec Itel | Quincy | 4/23/2001 |
| 857-253 | Paetec Itel | Cambridge | 4/23/2001 |
| 857-254 | Paetec Itel | Boston | 4/23/2001 |
| 857-255 | Paetec Itel | Newton | 4/23/2001 |
| 857-256 | Peerless Network Of Massachusetts | East Boston | 11/24/2011 |
| 857-257 | MetroPCS | South Boston | 4/20/2001 |
| 857-258 | MetroPCS | Boston | 6/25/2010 |
| 857-259 | New Cingular Wireless PCS | Cambridge | 5/24/2011 |
| 857-260 | Cellco Partnership | Boston | 3/8/2012 |
| 857-261 | MetroPCS | Boston | 2/22/2011 |
| 857-262 | Cellco Partnership | Boston | 9/3/2015 |
| 857-263 | Cellco Partnership | Boston | 7/12/2011 |
| 857-264 | Omnipoint Miami E License | Boston | 9/21/2010 |
| 857-265 | New Cingular Wireless PCS | Boston | 7/12/2011 |
| 857-266 | MetroPCS | Boston | 6/10/2010 |
| 857-267 | Comcast IP Phone | Milton | 7/15/2013 |
| 857-268 | Cellco Partnership | Boston | 9/8/2011 |
| 857-269 | Peerless Network Of Massachusetts | Roxbury | 4/24/2013 |
| 857-270 | Cellco Partnership | Cambridge | 9/30/2014 |
| 857-271 | Onvoy | Dorchester | 6/28/2013 |
| 857-272 | New Cingular Wireless PCS | Boston | 3/1/2006 |
| 857-273 | Comcast IP Phone | Jamaica Plain | 4/23/2013 |
| 857-274 | Cellco Partnership | Boston | 1/29/2016 |
| 857-275 | Cellco Partnership | Boston | 7/1/2015 |
| 857-276 | Cellco Partnership | Boston | 8/17/2015 |
| 857-277 | Omnipoint Miami E License | Boston | 1/3/2006 |
| 857-278 | Cellco Partnership | Boston | 7/1/2015 |
| 857-279 | Cellco Partnership | Newton | 1/29/2016 |
| 857-280 | Onvoy | Brighton | 2/26/2016 |
| 857-281 | Cellco Partnership | Quincy | 8/19/2020 |
| 857-282 | Verizon New England | Boston | 11/4/2015 |
| 857-283 | Cellco Partnership | Boston | 4/27/2017 |
| 857-284 | Omnipoint Miami E License | Boston | 1/15/2008 |
| 857-285 | Paetec Itel | Cambridge | 8/16/2012 |
| 857-286 | Cellco Partnership | Boston | 4/28/2017 |
| 857-287 | MetroPCS | Boston | 1/31/2017 |
| 857-288 | MCIMetro Access Transmission Services | Boston | 8/1/2006 |
| 857-289 | Onvoy | Boston | 5/1/2017 |
| 857-290 | Cellco Partnership | Newton | 5/16/2017 |
| 857-291 | Cellco Partnership | Boston | 8/7/2017 |
| 857-292 | Cellco Partnership | Boston | 8/8/2017 |
| 857-293 | Paetec Itel | East Boston | 2/15/2010 |
| 857-294 | Cellco Partnership | Boston | 5/11/2007 |
| 857-295 | Cellco Partnership | Boston | 8/8/2017 |
| 857-296 | Level 3 Communications | Boston | 8/16/2017 |
| 857-297 | Comcast IP Phone | Newton | 8/22/2017 |
| 857-298 | Onvoy Spectrum | Cambridge | 9/22/2017 |
| 857-299 | Onvoy | Belmont | 9/22/2017 |
| NPANXX | Carrier1 | Area Served2 | Date3 |
|---|---|---|---|
| 857-300 | Cellco Partnership | Boston | 10/8/2010 |
| 857-301 | Cellco Partnership | Boston | 12/6/2012 |
| 857-302 | Airus | Boston | 8/4/2014 |
| 857-303 | Cellco Partnership | Boston | 11/8/2012 |
| 857-304 | Tc Systems | Watertown | 3/13/2013 |
| 857-305 | Level 3 Communications | Boston | 7/19/2013 |
| 857-306 | Centurylink Communications | Boston | 10/17/2017 |
| 857-307 | Verizon New England | Brookline | 2/10/2006 |
| 857-308 | Omnipoint Miami E License | Roxbury | 9/16/2014 |
| 857-309 | Onvoy | Dorchester | 12/16/2014 |
| 857-310 | Omnipoint Miami E License | Boston | 10/14/2014 |
| 857-312 | MetroPCS | Boston | 8/4/2008 |
| 857-313 | Omnipoint Miami E License | Boston | 10/23/2012 |
| 857-314 | Bandwidth.com Clec | Milton | 1/28/2015 |
| 857-315 | Centurylink Communications | Boston | 10/17/2017 |
| 857-316 | Omnipoint Miami E License | Brighton | 2/27/2015 |
| 857-317 | Centurylink Communications | Boston | 3/7/2013 |
| 857-318 | MCIMetro Access Transmission Services | Boston | 10/17/2007 |
| 857-319 | Cellco Partnership | Boston | 6/4/2015 |
| 857-320 | Omnipoint Miami E License | Cambridge | 10/14/2014 |
| 857-321 | Cellco Partnership | Boston | 3/10/2011 |
| 857-322 | Comcast IP Phone | East Boston | 10/27/2017 |
| 857-323 | Verizon New England | Chelsea | 1/22/2013 |
| 857-324 | Cellco Partnership | Boston | 12/6/2017 |
| 857-325 | Cellco Partnership | Newton | 3/31/2015 |
| 857-326 | Cellco Partnership | Boston | 12/6/2017 |
| 857-327 | Cellco Partnership | Boston | 2/2/2015 |
| 857-328 | Voip Innovations | Boston | 6/25/2019 |
| 857-329 | Cellco Partnership | Boston | 12/29/2017 |
| 857-330 | Cellco Partnership | Boston | 10/1/2014 |
| 857-331 | Cellco Partnership | Cambridge | 7/22/2015 |
| 857-332 | Cellco Partnership | Boston | 1/15/2018 |
| 857-333 | Omnipoint Miami E License | Boston | 11/9/2010 |
| 857-334 | Omnipoint Miami E License | Boston | 9/20/2006 |
| 857-335 | Csc Wireless | Boston | 6/6/2019 |
| 857-336 | Onvoy | Winthrop | 3/1/2016 |
| 857-337 | Cellco Partnership | Brookline | 10/7/2015 |
| 857-338 | Tc Systems | Boston | 1/25/2018 |
| 857-339 | Commio | Roxbury | 02/09/2024 |
| 857-340 | Omnipoint Miami E License | Brookline | 9/29/2020 |
| 857-341 | Bandwidth.com Clec | Belmont | 2/7/2019 |
| 857-342 | Cellco Partnership | Hyde Park | 8/8/2007 |
| 857-343 | Cellco Partnership | Boston | 2/13/2018 |
| 857-344 | Cellco Partnership | Quincy | 4/9/2018 |
| 857-345 | Cellco Partnership | Hyde Park | N/A |
| 857-346 | Telengy | Boston | 5/23/2018 |
| 857-347 | Advanced Telecom Solutions | Boston | 7/13/2018 |
| 857-348 | New Cingular Wireless PCS | Boston | 8/13/2018 |
| 857-349 | Bandwidth.com Clec | Winthrop | 9/20/2018 |
| 857-350 | Cellco Partnership | Boston | 6/18/2007 |
| 857-351 | Omnipoint Miami E License | Roxbury | 05/17/2024 |
| 857-352 | Omnipoint Miami E License | Brookline | 1/22/2015 |
| 857-353 | MCIMetro Access Transmission Services | Boston | 1/6/2020 |
| 857-354 | Omnipoint Miami E License | Boston | 11/21/2018 |
| 857-355 | Airus | Everett | 10/7/2019 |
| 857-356 | Omnipoint Miami E License | Boston | 10/11/2019 |
| 857-357 | Megaphone | Cambridge | 12/24/2019 |
| 857-358 | New Cingular Wireless PCS | Quincy | 3/23/2020 |
| 857-359 | Cellco Partnership | Quincy | 3/24/2020 |
| 857-360 | Cellco Partnership | Boston | 10/7/2015 |
| 857-361 | Omnipoint Miami E License | Brookline | N/A |
| 857-362 | Verizon New England | Boston | 7/19/2006 |
| 857-363 | Cellco Partnership | Everett | 4/24/2001 |
| 857-364 | Paetec Itel | Brookline | 3/20/2001 |
| 857-365 | Nuso | Boston | 5/29/2020 |
| 857-366 | Cellco Partnership | Boston | 3/15/2006 |
| 857-367 | Tc Systems | Watertown | 10/5/2020 |
| 857-368 | Paetec Itel | Boston | 8/2/2011 |
| 857-369 | Level 3 Communications | Boston | 12/21/2020 |
| 857-370 | Omnipoint Miami E License | Brookline | 3/26/2021 |
| 857-371 | Onvoy | Watertown | 4/19/2021 |
| 857-372 | Cellco Partnership | Quincy | 5/17/2021 |
| 857-373 | Paetec Itel | Belmont | 3/20/2001 |
| 857-374 | Onvoy | Quincy | 6/14/2021 |
| 857-375 | Onvoy | Dorchester | 6/14/2021 |
| 857-376 | Omnipoint Miami E License | Brookline | 6/29/2021 |
| 857-377 | Paetec Itel | Boston | 4/9/2014 |
| 857-378 | Verizon New England | Boston | 2/1/2017 |
| 857-379 | Commio | Roxbury | 7/28/2021 |
| 857-380 | Onvoy | East Boston | 5/13/2020 |
| 857-381 | Omnipoint Miami E License | Brookline | 9/9/2021 |
| 857-382 | Onvoy | East Boston | 6/14/2021 |
| 857-383 | Tc Systems | Boston | 11/1/2005 |
| 857-384 | Onvoy | Brighton | 7/16/2021 |
| 857-385 | New Cingular Wireless PCS | Dorchester | 6/1/2016 |
| 857-386 | Verizon New England | Chelsea | 8/4/2016 |
| 857-387 | Comcast IP Phone | Quincy | 9/10/2021 |
| 857-388 | Commio | Somerville | 9/24/2021 |
| 857-389 | Omnipoint Miami E License | Charlestown | 12/14/2001 |
| 857-390 | Omnipoint Miami E License | Brookline | 10/7/2021 |
| 857-391 | Omnipoint Miami E License | Charlestown | 12/3/2021 |
| 857-392 | Onvoy | Jamaica Plain | 6/14/2021 |
| 857-393 | Cellco Partnership | Boston | 1/23/2017 |
| 857-394 | MCIMetro Access Transmission Services | Belmont | 12/8/2021 |
| 857-395 | Omnipoint Miami E License | Roxbury | 1/27/2022 |
| 857-396 | Omnipoint Miami E License | Brookline | 7/28/2022 |
| 857-397 | Omnipoint Miami E License | Roxbury | 7/28/2022 |
| 857-398 | Omnipoint Miami E License | Roxbury | 9/21/2022 |
| 857-399 | Bandwidth.com Clec | Roxbury | 6/29/2001 |
| NPANXX | Carrier1 | Area Served2 | Date3 |
|---|---|---|---|
| 857-400 | Bandwidth.com Clec | Boston | 11/3/2010 |
| 857-401 | Paetec Itel | South Boston | 3/20/2001 |
| 857-402 | HD Carrier | East Boston | N/A |
| 857-403 | Paetec Itel | Quincy | 3/20/2001 |
| 857-404 | Comcast IP Phone | Newton | 6/15/2007 |
| 857-405 | Omnipoint Miami E License | Brookline | 11/8/2022 |
| 857-406 | Cellco Partnership | Boston | 11/16/2015 |
| 857-407 | New Cingular Wireless PCS | Roxbury | 6/1/2015 |
| 857-408 | Cellco Partnership | Boston | 11/25/2015 |
| 857-409 | Cellco Partnership | Boston | 9/21/2016 |
| 857-410 | Bandwidth.com Clec | Charlestown | 8/12/2016 |
| 857-412 | Onvoy | Cambridge | N/A |
| 857-413 | Level 3 Communications | Boston | 9/19/2005 |
| 857-414 | HD Carrier | Brighton | N/A |
| 857-415 | Vonage America | Boston | 7/3/2013 |
| 857-416 | U.S. Telepacific Corp. | Boston | 11/17/2022 |
| 857-417 | MetroPCS | Boston | 8/4/2008 |
| 857-418 | U.S. Telepacific Corp. | Dorchester | 11/17/2022 |
| 857-419 | New Cingular Wireless PCS | Milton | 8/8/2016 |
| 857-420 | Onvoy | Cambridge | 11/23/2022 |
| 857-421 | Omnipoint Miami E License | Brookline | 07/01/2024 |
| 857-422 | Onvoy | South Boston | 6/14/2021 |
| 857-423 | Omnipoint Miami E License | Brookline | 9/12/2019 |
| 857-424 | New Cingular Wireless PCS | Roxbury | 10/25/2016 |
| 857-425 | New Cingular Wireless PCS | Brighton | 9/6/2016 |
| 857-426 | Omnipoint Miami E License | Brookline | 11/01/2024 |
| 857-427 | Omnipoint Miami E License | Boston | 11/01/2024 |
| 857-428 | Onvoy | Everett | 06/09/2023 |
| 857-429 | Omnipoint Miami E License | Roxbury | 11/01/2024 |
| 857-430 | New Cingular Wireless PCS | Boston | 11/13/2024 |
| 857-431 | Wavenation | Boston | 07/10/2025 |
| 857-437 | Omnipoint Miami E License | Roxbury | 9/12/2019 |
| 857-443 | Commio | Boston | 5/22/2017 |
| 857-444 | Peerless Network Of Massachusetts | Boston | 11/22/2010 |
| 857-445 | New Cingular Wireless PCS | Boston | 3/21/2006 |
| 857-449 | Comcast IP Phone | Boston | 4/2/2002 |
| 857-452 | Omnipoint Miami E License | Charlestown | N/A |
| 857-453 | Level 3 Communications | Boston | 5/19/2005 |
| 857-465 | Fractel | Boston | 5/8/2020 |
| 857-466 | Ton80 Communications | Hyde Park | 2/7/2022 |
| 857-467 | Ton80 Communications | Somerville | 2/24/2022 |
| 857-468 | Ton80 Communications | Charlestown | 2/11/2022 |
| 857-472 | New Cingular Wireless PCS | Boston | 12/17/2001 |
| 857-475 | Onvoy | Chelsea | 4/1/2021 |
| 857-477 | Onvoy | Jamaica Plain | 2/10/2016 |
| 857-488 | Cellco Partnership | Boston | 9/13/2005 |
| 857-491 | Lightpath Of New England | Boston | 9/23/2021 |
| 857-492 | Omnipoint Miami E License | Roxbury | 7/30/2002 |
| 857-496 | Comcast IP Phone | South Boston | 11/17/2004 |
| 857-497 | Omnipoint Miami E License | Charleston | 08/17/2023 |
| 857-498 | New Cingular Wireless PCS | Brighton | 8/24/2001 |
| 857-499 | New Cingular Wireless PCS | Quincy | 3/29/2001 |
| NPANXX | Carrier1 | Area Served2 | Date3 |
|---|---|---|---|
| 857-500 | Cellco Partnership | Cambridge | 4/17/2011 |
| 857-504 | Level 3 Communications | Boston | 9/1/2015 |
| 857-505 | MetroPCS | Boston | 9/21/2016 |
| 857-506 | Omnipoint Miami E License | Roxbury | 10/06/2023 |
| 857-507 | Cellco Partnership | Boston | 9/21/2016 |
| 857-520 | Onvoy | Hyde Park | N/A |
| 857-523 | Cellco Partnership | Somerville | 5/3/2001 |
| 857-524 | MCIMetro Access Transmission Services | South Boston | 3/27/2001 |
| 857-526 | MetroPCS | Quincy | 7/30/2002 |
| 857-529 | Cellco Partnership | Cambridge | 2/3/2015 |
| 857-540 | Omnipoint Miami E License | Brighton | N/A |
| 857-544 | Omnipoint Miami E License | Roxbury | 11/28/2001 |
| 857-547 | Paetec Itel | Jamaica Plain | 3/20/2001 |
| 857-550 | Commio | Belmont | 09/26/2023 |
| 857-557 | HD Carrier | Boston | 8/27/2019 |
| 857-559 | MCIMetro Access Transmission Services | Brighton | 3/27/2001 |
| 857-565 | Omnipoint Miami E License | Brookline | 11/09/2023 |
| 857-567 | Onvoy | Dorchester | 5/15/2020 |
| 857-574 | Paetec Itel | East Boston | 3/20/2001 |
| 857-575 | Onvoy | Somerville | 4/1/2021 |
| 857-576 | Bandwidth.com Clec | Brookline | 5/18/2001 |
| 857-577 | Onvoy | Charlestown | 2/11/2016 |
| 857-578 | Twilio International | Newton | 10/9/2020 |
| 857-579 | Omnipoint Miami E License | Boston | 01/07/2025 |
| 857-587 | HD Carrier | Dorchester | 1/29/2016 |
| 857-588 | MCIMetro Access Transmission Services | Charlestown | 3/27/2001 |
| 857-597 | Onvoy | Winthrop | 4/1/2021 |
| 857-598 | MCIMetro Access Transmission Services | Milton | 3/20/2001 |
| NPANXX | Carrier1 | Area Served2 | Date3 |
|---|---|---|---|
| 857-600 | Bandwidth.com Clec | Cambridge | 4/6/2011 |
| 857-605 | Omnipoint Miami E License | Brighton | 10/11/2023 |
| 857-615 | MetroPCS | Boston | 6/11/2009 |
| 857-626 | MCIMetro Access Transmission Services | Belmont | 6/29/2001 |
| 857-636 | Cellco Partnership | Newton | 7/6/2001 |
| 857-639 | Ton80 Communications | Cambridge | 2/15/2022 |
| 857-654 | Omnipoint Miami E License | Boston | 10/17/2006 |
| 857-656 | Omnipoint Miami E License | Boston | 11/21/2024 |
| 857-663 | Onvoy | Dorchester | 3/20/2017 |
| 857-666 | Onvoy | Brookline | 3/23/2015 |
| 857-675 | Onvoy | Roxbury | 4/2/2021 |
| 857-678 | Onvoy | Belmont | 4/2/2021 |
| 857-688 | Fractel | Dorchester | 10/26/2021 |
| 857-693 | Ton80 Communications | Roxbury | 2/15/2022 |
| NPANXX | Carrier1 | Area Served2 | Date3 |
|---|---|---|---|
| 857-701 | Omnipoint Miami E License | Roxbury | 1/15/2014 |
| 857-702 | Nuso | Boston | 2/7/2014 |
| 857-703 | Cellco Partnership | Hyde Park | 7/28/2014 |
| 857-706 | Level 3 Communications | Cambridge | 7/31/2014 |
| 857-707 | Cellco Partnership | Brookline | 10/10/2014 |
| 857-719 | MetroPCS | Jamaica Plain | 7/30/2002 |
| 857-728 | MCIMetro Access Transmission Services | Jamaica Plain | 3/27/2001 |
| 857-737 | Ton80 Communications | Watertown | 3/22/2022 |
| 857-746 | Ton80 Communications | Brookline | 2/9/2022 |
| 857-753 | Cellco Partnership | Boston | 8/9/2005 |
| 857-754 | Onvoy | Quincy | 12/8/2020 |
| 857-755 | Fractel | Quincy | 9/3/2020 |
| 857-756 | Metropolitan Telecommunications Of Mass | Cambridge | 7/26/2005 |
| 857-757 | The Voice Application Network | Cambridge | 3/9/2015 |
| 857-758 | Fractel | Boston | 4/27/2021 |
| 857-760 | Bandwidth.com Clec | Watertown | 6/21/2016 |
| 857-762 | MetroPCS | Boston | 7/18/2016 |
| 857-763 | Omnipoint Miami E License | Boston | 7/22/2016 |
| 857-766 | Fractel | South Boston | 7/21/2020 |
| 857-767 | Ton80 Communications | Boston | 1/7/2022 |
| 857-770 | Intrado Communications | Boston | 12/23/2014 |
| 857-772 | Cellco Partnership | Boston | 7/27/2016 |
| 857-773 | MetroPCS | Jamaica Plain | 9/12/2016 |
| 857-776 | Level 3 Communications | Chelsea | 6/29/2001 |
| 857-777 | Peerless Network Of Massachusetts | Cambridge | 3/5/2012 |
| 857-788 | Skye Telecom | Boston | 8/20/2021 |
| 857-799 | HD Carrier | Cambridge | 11/6/2018 |
| NPANXX | Carrier1 | Area Served2 | Date3 |
|---|---|---|---|
| 857-800 | Onvoy | Boston | 3/20/2015 |
| 857-810 | Onvoy | Boston | 3/11/2021 |
| 857-816 | MCIMetro Access Transmission Services | Winthrop | 3/20/2001 |
| 857-822 | Onvoy Spectrum | Somerville | 11/07/2024 |
| 857-829 | Omnipoint Miami E License | Cambridge | 8/13/2002 |
| 857-832 | Ton80 Communications | Brighton | 2/11/2022 |
| 857-833 | Onvoy Spectrum | Winthrop | 11/07/2024 |
| 857-837 | Onvoy | Charlestown | 5/28/2020 |
| 857-847 | Onvoy Spectrum | Dorchester | 3/17/2021 |
| 857-855 | Onvoy | Boston | 1/25/2021 |
| 857-856 | Onvoy | Cambridge | 3/18/2015 |
| 857-857 | Onvoy Spectrum | Newton | 11/07/2024 |
| 857-858 | Onvoy | Newton | 5/13/2020 |
| 857-867 | Onvoy Spectrum | Brookline | 3/17/2021 |
| 857-869 | Omnipoint Miami E License | Boston | 7/23/2007 |
| 857-877 | Onvoy | Brighton | 5/13/2020 |
| 857-880 | Barr Tell USA | Boston | 11/23/2015 |
| 857-887 | Onvoy Spectrum | Jamaica Plain | 12/18/2020 |
| 857-888 | MetroPCS | Everett | 7/30/2002 |
| 857-891 | Omnipoint Miami E License | Boston | 4/2/2001 |
| 857-895 | Rclec | Boston | 2/2/2017 |
| NPANXX | Carrier1 | Area Served2 | Date3 |
|---|---|---|---|
| 857-919 | Omnipoint Miami E License | Brighton | 4/2/2001 |
| 857-928 | Omnipoint Miami E License | Cambridge | 8/3/2001 |
| 857-930 | Rclec | Boston | 6/10/2014 |
| 857-939 | Cellco Partnership | Quincy | 6/15/2001 |
| 857-944 | New Cingular Wireless PCS | Boston | 11/12/2024 |
| 857-957 | Wide Voice | Boston | 9/30/2014 |
| 857-961 | Omnipoint Miami E License | Brighton | 01/09/2023 |
| 857-971 | Onvoy | Charlestown | 5/9/2016 |
| 857-972 | Level 3 Communications | Boston | 7/29/2015 |
| 857-989 | New Cingular Wireless PCS | Newton | 11/11/2024 |
| 857-990 | Evolve Cellular | Boston | 9/22/2015 |
| 857-991 | Comcast IP Phone | Boston | 6/19/2001 |
| 857-994 | Dish Wireless | Newton | 05/06/2025 |
| 857-995 | Onvoy | Somerville | 3/29/2001 |
| 857-996 | MCIMetro Access Transmission Services | Boston | N/A |
| 857-997 | HD Carrier | Somerville | 5/18/2001 |
| 857-998 | Cellco Partnership | Cambridge | 5/3/2001 |
| 857-999 | Peerless Network Of Massachusetts | Cambridge | 5/23/2012 |
- NPA-NXX assigned carrier; with Number Pooling thousand block numbers are often assigned to other carriers as well; moreover, phone numbers can be ported between service providers
- For 'Area served' we list the rate center. In the North American Numbering Plan a rate center is a geographic area used to determine local calling boundaries for billing purposes. Its name is generally a locality, often not the only one served by an NPA-NXX combination.
- Assignment date. N/A - mostly central office codes assigned before 2001.
- NXX prefixes last updated: November 22, 2025
Cities in area code 857
| City1 | County | Time Zone1 |
|---|---|---|
| Allston | Suffolk | E |
| Auburndale | Middlesex | E |
| Boston | Suffolk | E |
| Brighton | Suffolk | E |
| Brookline | Norfolk | E |
| Brookline Village | Norfolk | E |
| Cambridge | Middlesex | E |
| Charlestown | Suffolk | E |
| Chelsea | Suffolk | E |
| Chestnut Hill | Middlesex | E |
| East Boston | Suffolk | E |
| Everett | Middlesex | E |
| Hyde Park | Suffolk | E |
| Jamaica Plain | Suffolk | E |
| Mattapan | Suffolk | E |
| Milton | Norfolk | E |
| Milton Village | Norfolk | E |
| Needham Heights | Norfolk | E |
| New Town | Middlesex | E |
| Newton | Middlesex | E |
| Newton Center | Middlesex | E |
| Newton Highlands | Middlesex | E |
| Newton Lower Falls | Middlesex | E |
| Newton Upper Falls | Middlesex | E |
| Newtonville | Middlesex | E |
| Nonantum | Middlesex | E |
| North Waltham | Middlesex | E |
| Quincy | Norfolk | E |
| Readville | Suffolk | E |
| Roslindale | Suffolk | E |
| Somerville | Middlesex | E |
| Waban | Middlesex | E |
| Watertown | Middlesex | E |
| West Newton | Middlesex | E |
| West Roxbury | Suffolk | E |
| Winthrop | Suffolk | E |
- Listed above are most places served by USA area code 857. When multiple places in a US state share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
- E stands for Eastern Time (currently ).
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