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Area Code 857

Area code 857 is in Massachusetts, USA, spanning 3 counties and serving 36 cities, including Boston, Newton or Somerville; it currently uses 344 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 01:50:58 PM (Eastern Time Zone).

857 area code location on a map

*For exact NPA boundaries see official 857 area code map

More Massachusetts area codes:

Reverse phone lookup

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Locate any 857-NXX prefix:

NPANXX Area served1 Date2
857-200 Boston 1/10/2011
857-201 Winthrop 10/28/2002
857-202 Boston 11/10/2011
857-203 Jamaica Plain 2/28/2005
857-204 Boston 3/20/2001
857-205 Boston 3/19/2001
857-206 Boston 10/7/2011
857-207 Boston 4/11/2007
857-208 Boston 2/8/2012
857-209 Cambridge 10/11/2001
857-210 Boston 3/10/2011
857-212 Dorchester 4/23/2001
857-213 Boston 10/3/2011
857-214 Boston 12/6/2011
857-215 Brookline 2/23/2010
857-216 Newton 11/3/2009
857-217 Dorchester 6/29/2001
857-218 Brookline 1/12/2007
857-219 Newton 2/16/2012
857-220 Dorchester 3/20/2001
857-221 Boston 5/25/2005
857-222 Boston 5/17/2001
857-223 Boston N/A
857-224 Boston 12/17/2009
857-225 Brookline 5/3/2001
857-226 Newton 3/30/2006
857-227 Somerville 5/23/2001
857-228 Watertown 7/12/2001
857-229 Newton N/A
857-230 Roxbury 4/15/2009
857-231 Newton 7/30/2002
857-232 Newton 5/17/2006
857-233 Boston 2/16/2006
857-234 Brookline 3/18/2002
857-235 Cambridge 11/18/2008
857-236 Boston 8/4/2008
857-237 Boston 6/8/2009
857-238 Boston 11/14/2007
857-239 Boston N/A
857-240 Newton 2/28/2012
857-241 Boston 10/24/2006
857-242 Cambridge 9/8/2011
857-243 Boston 11/5/2009
857-244 Boston 6/10/2008
857-245 Brookline 11/2/2006
857-246 Boston N/A
857-247 Boston 6/8/2009
857-248 Boston 3/8/2012
857-249 Boston 8/4/2008
857-250 Boston 7/15/2011
857-251 Boston 8/4/2008
857-252 Quincy 4/23/2001
857-253 Cambridge 4/23/2001
857-254 Boston 4/23/2001
857-255 Newton 4/23/2001
857-256 East Boston 11/24/2011
857-257 South Boston 4/20/2001
857-258 Boston 6/25/2010
857-259 Cambridge 5/24/2011
857-260 Boston 3/8/2012
857-261 Boston 2/22/2011
857-262 Boston 9/3/2015
857-263 Boston 7/12/2011
857-264 Boston 9/21/2010
857-265 Boston 7/12/2011
857-266 Boston 6/10/2010
857-267 Milton 7/15/2013
857-268 Boston 9/8/2011
857-269 Roxbury 4/24/2013
857-270 Cambridge 9/30/2014
857-271 Dorchester 6/28/2013
857-272 Boston 3/1/2006
857-273 Jamaica Plain 4/23/2013
857-274 Boston 1/29/2016
857-275 Boston 7/1/2015
857-276 Boston 8/17/2015
857-277 Boston 1/3/2006
857-278 Boston 7/1/2015
857-279 Newton 1/29/2016
857-280 Brighton 2/26/2016
857-281 Quincy 8/19/2020
857-282 Boston 11/4/2015
857-283 Boston 4/27/2017
857-284 Boston 1/15/2008
857-285 Cambridge 8/16/2012
857-286 Boston 4/28/2017
857-287 Boston 1/31/2017
857-288 Boston 8/1/2006
857-289 Boston 5/1/2017
857-290 Newton 5/16/2017
857-291 Boston 8/7/2017
857-292 Boston 8/8/2017
857-293 East Boston 2/15/2010
857-294 Boston 5/11/2007
857-295 Boston 8/8/2017
857-296 Boston 8/16/2017
857-297 Newton 8/22/2017
857-298 Cambridge 9/22/2017
857-299 Belmont 9/22/2017

NPANXX Area served1 Date2
857-300 Boston 10/8/2010
857-301 Boston 12/6/2012
857-302 Boston 8/4/2014
857-303 Boston 11/8/2012
857-304 Watertown 3/13/2013
857-305 Boston 7/19/2013
857-306 Boston 10/17/2017
857-307 Brookline 2/10/2006
857-308 Roxbury 9/16/2014
857-309 Dorchester 12/16/2014
857-310 Boston 10/14/2014
857-312 Boston 8/4/2008
857-313 Boston 10/23/2012
857-314 Milton 1/28/2015
857-315 Boston 10/17/2017
857-316 Brighton 2/27/2015
857-317 Boston 3/7/2013
857-318 Boston 10/17/2007
857-319 Boston 6/4/2015
857-320 Cambridge 10/14/2014
857-321 Boston 3/10/2011
857-322 East Boston 10/27/2017
857-323 Chelsea 1/22/2013
857-324 Boston 12/6/2017
857-325 Newton 3/31/2015
857-326 Boston 12/6/2017
857-327 Boston 2/2/2015
857-328 Boston 6/25/2019
857-329 Boston 12/29/2017
857-330 Boston 10/1/2014
857-331 Cambridge 7/22/2015
857-332 Boston 1/15/2018
857-333 Boston 11/9/2010
857-334 Boston 9/20/2006
857-335 Boston 6/6/2019
857-336 Winthrop 3/1/2016
857-337 Brookline 10/7/2015
857-338 Boston 1/25/2018
857-339 Roxbury 02/09/2024
857-340 Brookline 9/29/2020
857-341 Belmont 2/7/2019
857-342 Hyde Park 8/8/2007
857-343 Boston 2/13/2018
857-344 Quincy 4/9/2018
857-345 Hyde Park N/A
857-346 Boston 5/23/2018
857-347 Boston 7/13/2018
857-348 Boston 8/13/2018
857-349 Winthrop 9/20/2018
857-350 Boston 6/18/2007
857-352 Brookline 1/22/2015
857-353 Boston 1/6/2020
857-354 Boston 11/21/2018
857-355 Everett 10/7/2019
857-356 Boston 10/11/2019
857-357 Cambridge 12/24/2019
857-358 Quincy 3/23/2020
857-359 Quincy 3/24/2020
857-360 Boston 10/7/2015
857-361 Brookline N/A
857-362 Boston 7/19/2006
857-363 Everett 4/24/2001
857-364 Brookline 3/20/2001
857-365 Boston 5/29/2020
857-366 Boston 3/15/2006
857-367 Watertown 10/5/2020
857-368 Boston 8/2/2011
857-369 Boston 12/21/2020
857-370 Brookline 3/26/2021
857-371 Watertown 4/19/2021
857-372 Quincy 5/17/2021
857-373 Belmont 3/20/2001
857-374 Quincy 6/14/2021
857-375 Dorchester 6/14/2021
857-376 Brookline 6/29/2021
857-377 Boston 4/9/2014
857-378 Boston 2/1/2017
857-379 Roxbury 7/28/2021
857-380 East Boston 5/13/2020
857-381 Brookline 9/9/2021
857-382 East Boston 6/14/2021
857-383 Boston 11/1/2005
857-384 Brighton 7/16/2021
857-385 Dorchester 6/1/2016
857-386 Chelsea 8/4/2016
857-387 Quincy 9/10/2021
857-388 Somerville 9/24/2021
857-389 Charlestown 12/14/2001
857-390 Brookline 10/7/2021
857-391 Charlestown 12/3/2021
857-392 Jamaica Plain 6/14/2021
857-393 Boston 1/23/2017
857-394 Belmont 12/8/2021
857-395 Roxbury 1/27/2022
857-396 Brookline 7/28/2022
857-397 Roxbury 7/28/2022
857-398 Roxbury 9/21/2022
857-399 Roxbury 6/29/2001

NPANXX Area served1 Date2
857-400 Boston 11/3/2010
857-401 South Boston 3/20/2001
857-402 East Boston N/A
857-403 Quincy 3/20/2001
857-404 Newton 6/15/2007
857-405 Brookline 11/8/2022
857-406 Boston 11/16/2015
857-407 Roxbury 6/1/2015
857-408 Boston 11/25/2015
857-409 Boston 9/21/2016
857-410 Charlestown 8/12/2016
857-412 Cambridge N/A
857-413 Boston 9/19/2005
857-414 Brighton N/A
857-415 Boston 7/3/2013
857-416 Boston 11/17/2022
857-417 Boston 8/4/2008
857-418 Dorchester 11/17/2022
857-419 Milton 8/8/2016
857-420 Cambridge 11/23/2022
857-422 South Boston 6/14/2021
857-423 Brookline 9/12/2019
857-424 Roxbury 10/25/2016
857-425 Brighton 9/6/2016
857-428 Everett 06/09/2023
857-437 Roxbury 9/12/2019
857-443 Boston 5/22/2017
857-444 Boston 11/22/2010
857-445 Boston 3/21/2006
857-449 Boston 4/2/2002
857-452 Charlestown N/A
857-453 Boston 5/19/2005
857-465 Boston 5/8/2020
857-466 Hyde Park 2/7/2022
857-467 Somerville 2/24/2022
857-468 Charlestown 2/11/2022
857-472 Boston 12/17/2001
857-475 Chelsea 4/1/2021
857-477 Jamaica Plain 2/10/2016
857-488 Boston 9/13/2005
857-491 Boston 9/23/2021
857-492 Roxbury 7/30/2002
857-496 South Boston 11/17/2004
857-497 Charleston 08/17/2023
857-498 Brighton 8/24/2001
857-499 Quincy 3/29/2001

NPANXX Area served1 Date2
857-500 Cambridge 4/17/2011
857-504 Boston 9/1/2015
857-505 Boston 9/21/2016
857-506 Roxbury 10/06/2023
857-507 Boston 9/21/2016
857-520 Hyde Park N/A
857-523 Somerville 5/3/2001
857-524 South Boston 3/27/2001
857-526 Quincy 7/30/2002
857-529 Cambridge 2/3/2015
857-540 Brighton N/A
857-544 Roxbury 11/28/2001
857-547 Jamaica Plain 3/20/2001
857-550 Belmont 09/26/2023
857-557 Boston 8/27/2019
857-559 Brighton 3/27/2001
857-565 Brookline 11/09/2023
857-567 Dorchester 5/15/2020
857-574 East Boston 3/20/2001
857-575 Somerville 4/1/2021
857-576 Brookline 5/18/2001
857-577 Charlestown 2/11/2016
857-578 Newton 10/9/2020
857-587 Dorchester 1/29/2016
857-588 Charlestown 3/27/2001
857-597 Winthrop 4/1/2021
857-598 Milton 3/20/2001

NPANXX Area served1 Date2
857-600 Cambridge 4/6/2011
857-605 Brighton 10/11/2023
857-615 Boston 6/11/2009
857-626 Belmont 6/29/2001
857-636 Newton 7/6/2001
857-639 Cambridge 2/15/2022
857-654 Boston 10/17/2006
857-663 Dorchester 3/20/2017
857-666 Brookline 3/23/2015
857-675 Roxbury 4/2/2021
857-678 Belmont 4/2/2021
857-688 Dorchester 10/26/2021
857-693 Roxbury 2/15/2022

NPANXX Area served1 Date2
857-701 Roxbury 1/15/2014
857-702 Boston 2/7/2014
857-703 Hyde Park 7/28/2014
857-706 Cambridge 7/31/2014
857-707 Brookline 10/10/2014
857-719 Jamaica Plain 7/30/2002
857-728 Jamaica Plain 3/27/2001
857-737 Watertown 3/22/2022
857-746 Brookline 2/9/2022
857-753 Boston 8/9/2005
857-754 Quincy 12/8/2020
857-755 Quincy 9/3/2020
857-756 Cambridge 7/26/2005
857-757 Cambridge 3/9/2015
857-758 Boston 4/27/2021
857-760 Watertown 6/21/2016
857-762 Boston 7/18/2016
857-763 Boston 7/22/2016
857-766 South Boston 7/21/2020
857-767 Boston 1/7/2022
857-770 Boston 12/23/2014
857-772 Boston 7/27/2016
857-773 Jamaica Plain 9/12/2016
857-776 Chelsea 6/29/2001
857-777 Cambridge 3/5/2012
857-788 Boston 8/20/2021
857-799 Cambridge 11/6/2018

NPANXX Area served1 Date2
857-800 Boston 3/20/2015
857-810 Boston 3/11/2021
857-814 Boston N/A
857-816 Winthrop 3/20/2001
857-829 Cambridge 8/13/2002
857-832 Brighton 2/11/2022
857-837 Charlestown 5/28/2020
857-847 Dorchester 3/17/2021
857-855 Boston 1/25/2021
857-856 Cambridge 3/18/2015
857-858 Newton 5/13/2020
857-867 Brookline 3/17/2021
857-869 Boston 7/23/2007
857-877 Brighton 5/13/2020
857-880 Boston 11/23/2015
857-887 Jamaica Plain 12/18/2020
857-888 Everett 7/30/2002
857-891 Boston 4/2/2001
857-895 Boston 2/2/2017

NPANXX Area served1 Date2
857-919 Brighton 4/2/2001
857-928 Cambridge 8/3/2001
857-930 Boston 6/10/2014
857-939 Quincy 6/15/2001
857-957 Boston 9/30/2014
857-961 Brighton 01/09/2023
857-971 Charlestown 5/9/2016
857-972 Boston 7/29/2015
857-990 Boston 9/22/2015
857-991 Boston 6/19/2001
857-995 Somerville 3/29/2001
857-996 Boston N/A
857-997 Somerville 5/18/2001
857-998 Cambridge 5/3/2001
857-999 Cambridge 5/23/2012
  1. 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.
  2. Assignment date. N/A - mostly central office codes assigned before 2001.
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Cities in area code 857

City1 County Time2
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
  1. 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.
  2. E stands for Eastern Time Zone (currently 01:50:58 PM).
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