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Area Code 603

Area code 603 is in New Hampshire, USA , spanning 10 counties and serving 257 cities, including Manchester, Nashua or Concord; it currently uses 752 prefixes, assigned from 603-200-XXXX through 603-999-XXXX.

In service date for area code 603: January 01, 1947.

The current local time is .

603 area code location on a map
© OpenStreetMap contributors
For exact NPA boundaries see official 603 area code map

Phone number lookup

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Locate any 603-NXX prefix:

NPANXX Area Served1 Date2
603-200 Newmarket 8/16/2011
603-202 Concord 01/13/2023
603-203 Manchester 5/14/2003
603-204 Nashua N/A
603-205 Portsmouth N/A
603-206 Manchester N/A
603-207 Derry 9/13/2022
603-208 Lyme N/A
603-209 Keene N/A
603-210 Suncook N/A
603-212 Salem N/A
603-213 Milford 11/8/2012
603-214 Errol N/A
603-215 Berlin N/A
603-216 Derry N/A
603-217 Bristol 7/11/2001
603-218 Manchester N/A
603-219 Concord 2/14/2001
603-221 Nashua N/A
603-222 Manchester N/A
603-223 Concord N/A
603-224 Concord N/A
603-225 Concord N/A
603-226 Concord N/A
603-227 Concord N/A
603-228 Concord N/A
603-229 Concord N/A
603-230 Concord N/A
603-231 Derry 5/3/2001
603-232 Manchester N/A
603-233 Nashua N/A
603-234 Derry 5/3/2001
603-235 Derry 5/3/2001
603-236 Campton N/A
603-237 Colebrook N/A
603-238 Plymouth N/A
603-239 Winchester N/A
603-240 Manchester N/A
603-241 Manchester N/A
603-242 Troy N/A
603-243 Woodsville 7/20/2011
603-244 Raymond N/A
603-245 Portsmouth N/A
603-246 West Stewartstown N/A
603-247 Derry N/A
603-248 Dover N/A
603-249 Milford N/A
603-250 Center Harbor N/A
603-251 Charlestown 2/28/2012
603-252 West Lebanon 3/22/2001
603-253 Center Harbor N/A
603-254 Plymouth N/A
603-255 Manchester 2/19/2020
603-256 West Chesterfield N/A
603-257 Plaistow N/A
603-258 Hollis 4/14/2017
603-259 Littleton N/A
603-260 Derry 1/4/2013
603-261 Merrimack N/A
603-262 Merrimack N/A
603-263 Manchester N/A
603-264 Manchester N/A
603-265 New Boston N/A
603-266 Tilton N/A
603-267 Belmont N/A
603-268 Suncook N/A
603-269 Center Barnstead N/A
603-270 Suncook N/A
603-271 Concord N/A
603-272 Piermont N/A
603-273 Laconia N/A
603-274 South Hampton N/A
603-275 Derry N/A
603-276 West Lebanon N/A
603-277 Hanover 10/13/2006
603-278 Bretton Woods N/A
603-279 Meredith N/A
603-280 Barrington N/A
603-281 Nashua N/A
603-282 Canaan N/A
603-283 Keene N/A
603-284 Center Sandwich N/A
603-285 Dover N/A
603-286 Tilton N/A
603-287 Claremont N/A
603-288 Nashua 7/5/2017
603-289 Manchester N/A
603-290 Concord N/A
603-291 Greenville 10/26/2006
603-292 Newmarket N/A
603-293 Laconia N/A
603-294 Portsmouth N/A
603-295 Durham 4/26/2001
603-296 Manchester N/A
603-297 Center Ossipee N/A
603-298 West Lebanon N/A
603-299 Bartlett 7/28/2017
NPANXX Area Served1 Date2
603-300 Chester 6/9/2003
603-301 Center Ossipee 7/11/2001
603-302 Manchester 9/19/2001
603-303 Raymond 3/9/2001
603-304 Enfield N/A
603-305 Nashua 8/21/2001
603-306 Lebanon 12/18/2006
603-307 North Conway 9/6/2012
603-308 Hanover 9/30/2014
603-309 Newport 8/9/2013
603-310 Bedford N/A
603-312 Dover N/A
603-313 Keene N/A
603-314 Manchester N/A
603-315 Manchester N/A
603-316 Milford 10/16/2017
603-317 Milan N/A
603-318 Nashua N/A
603-319 Portsmouth N/A
603-320 Nashua N/A
603-321 Nashua N/A
603-322 West Lebanon N/A
603-323 Tamworth N/A
603-324 Nashua N/A
603-325 New Boston N/A
603-326 Berlin N/A
603-327 Salem N/A
603-328 Salem N/A
603-329 Hampstead N/A
603-330 Rochester N/A
603-331 Colebrook N/A
603-332 Rochester N/A
603-333 Concord N/A
603-334 Portsmouth N/A
603-335 Rochester N/A
603-336 Hinsdale N/A
603-337 Rochester N/A
603-338 Keene N/A
603-339 Derry N/A
603-340 Suncook 2/12/2001
603-341 Merrimack N/A
603-342 Berlin N/A
603-343 Dover N/A
603-344 Suncook N/A
603-345 Merrimack N/A
603-346 Plymouth N/A
603-347 Kingston N/A
603-348 North Woodstock N/A
603-349 West Lebanon N/A
603-350 Milton N/A
603-351 Goffstown N/A
603-352 Keene N/A
603-353 Orford N/A
603-354 Keene N/A
603-355 Keene N/A
603-356 North Conway N/A
603-357 Keene N/A
603-358 Keene N/A
603-359 Lebanon N/A
603-360 Orford 6/11/2010
603-361 Manchester 5/18/2001
603-362 Hampstead N/A
603-363 Spofford N/A
603-364 Gilmanton Iron Works N/A
603-365 Merrimack 5/4/2001
603-366 Laconia N/A
603-367 Madison N/A
603-368 Portsmouth 12/27/2017
603-369 Concord N/A
603-370 Candia 10/17/2001
603-371 Peterborough N/A
603-372 Claremont N/A
603-373 Portsmouth N/A
603-374 Bartlett N/A
603-375 Ashland 7/19/2012
603-376 Dover N/A
603-377 Merrimack N/A
603-378 Plaistow N/A
603-379 Rye Beach N/A
603-380 Portsmouth N/A
603-381 West Lebanon N/A
603-382 Plaistow N/A
603-383 Jackson N/A
603-384 Goffstown N/A
603-385 Manchester N/A
603-386 Salem N/A
603-387 Laconia N/A
603-388 Colebrook N/A
603-389 Durham N/A
603-390 Jefferson N/A
603-391 Manchester N/A
603-392 Winchester 11/7/2006
603-393 Laconia 5/4/2001
603-394 South Hampton N/A
603-395 Exeter N/A
603-396 Merrimack N/A
603-397 Durham N/A
603-398 West Lebanon N/A
603-399 Westmoreland N/A
NPANXX Area Served1 Date2
603-400 Hollis 8/31/2011
603-401 Salem 10/17/2001
603-402 Nashua 9/6/2012
603-403 Rochester 7/31/2018
603-404 Derry 1/4/2016
603-405 Somersworth 4/20/2016
603-406 Concord 12/21/2018
603-407 Belmont 5/6/2015
603-408 Berlin 12/9/2015
603-409 Laconia 10/13/2015
603-410 Concord N/A
603-412 Plymouth N/A
603-413 Manchester N/A
603-414 Sunapee N/A
603-415 Concord N/A
603-416 Raymond 12/21/2018
603-417 Nashua 4/14/2015
603-418 Exeter N/A
603-419 Suncook N/A
603-420 Merrimack N/A
603-421 Derry N/A
603-422 Portsmouth N/A
603-423 Merrimack N/A
603-424 Merrimack N/A
603-425 Derry N/A
603-426 Derry N/A
603-427 Portsmouth N/A
603-428 Henniker N/A
603-429 Merrimack N/A
603-430 Portsmouth N/A
603-431 Portsmouth N/A
603-432 Derry N/A
603-433 Portsmouth N/A
603-434 Derry N/A
603-435 Pittsfield N/A
603-436 Portsmouth N/A
603-437 Derry N/A
603-438 Nashua N/A
603-439 Keene N/A
603-440 Merrimack N/A
603-441 Rochester 9/9/2021
603-442 Lebanon N/A
603-443 Lebanon N/A
603-444 Littleton N/A
603-445 North Walpole N/A
603-446 Marlow N/A
603-447 Conway N/A
603-448 Lebanon N/A
603-449 Milan N/A
603-450 Concord 9/11/2018
603-451 Concord 4/8/2020
603-452 Conway N/A
603-453 Hampstead N/A
603-454 Sunapee N/A
603-455 Laconia N/A
603-456 Warner N/A
603-457 Dover 11/27/2020
603-458 Salem N/A
603-459 Nashua N/A
603-460 Deerfield N/A
603-461 Merrimack N/A
603-462 Deerfield N/A
603-463 Deerfield N/A
603-464 Hillsboro N/A
603-465 Hollis N/A
603-466 Gorham N/A
603-467 Manchester N/A
603-468 Seabrook N/A
603-469 Meriden N/A
603-470 Concord 4/19/2001
603-471 Bedford N/A
603-472 Bedford N/A
603-473 Milton Mills N/A
603-474 Seabrook N/A
603-475 Salem N/A
603-476 Center Sandwich N/A
603-477 Claremont N/A
603-478 Hillsboro Upper Village N/A
603-479 Derry N/A
603-480 Manchester N/A
603-481 Plymouth N/A
603-482 Errol N/A
603-483 Candia N/A
603-484 Nashua 9/21/2016
603-485 Suncook N/A
603-486 Manchester N/A
603-487 New Boston N/A
603-488 Bedford N/A
603-489 Hampstead N/A
603-490 Derry N/A
603-491 Concord N/A
603-492 Manchester N/A
603-493 Merrimack N/A
603-494 Merrimack N/A
603-495 Washington N/A
603-496 Concord N/A
603-497 Goffstown N/A
603-498 Portsmouth N/A
603-499 Keene N/A
NPANXX Area Served1 Date2
603-500 Tilton 6/15/2020
603-501 Portsmouth N/A
603-502 Portsmouth N/A
603-503 Lancaster N/A
603-504 Claremont N/A
603-505 Derry 10/9/2002
603-506 Manchester 10/29/2018
603-507 Rochester 7/28/2015
603-508 Pelham 8/8/2001
603-509 Rochester 9/24/2001
603-510 Meriden 3/29/2010
603-512 Manchester N/A
603-513 Concord N/A
603-514 Nashua 1/21/2021
603-515 Wolfeboro N/A
603-516 Dover N/A
603-517 Merrimack N/A
603-518 Manchester N/A
603-519 Exeter 10/4/2018
603-520 Laconia N/A
603-521 Nashua N/A
603-522 Sanbornville N/A
603-523 Canaan N/A
603-524 Laconia N/A
603-525 Hancock N/A
603-526 New London N/A
603-527 Laconia N/A
603-528 Laconia N/A
603-529 Weare N/A
603-530 Bristol 2/22/2002
603-531 Portsmouth N/A
603-532 Jaffrey N/A
603-533 Merrimack N/A
603-534 Dover N/A
603-535 Plymouth N/A
603-536 Plymouth N/A
603-537 Derry N/A
603-538 Pittsburg N/A
603-539 Center Ossipee N/A
603-540 Manchester 8/21/2001
603-541 Manchester 5/21/2001
603-542 Claremont N/A
603-543 Claremont N/A
603-544 Melvin Village N/A
603-545 Concord N/A
603-546 Nashua N/A
603-547 Greenfield N/A
603-548 Derry N/A
603-549 Derry N/A
603-550 Dover 11/18/2021
603-551 Manchester N/A
603-552 Derry N/A
603-553 Derry N/A
603-554 Milford N/A
603-556 Laconia N/A
603-557 Nashua N/A
603-558 Claremont N/A
603-559 Portsmouth N/A
603-560 Salem N/A
603-561 Nashua N/A
603-562 Peterborough N/A
603-563 Dublin N/A
603-564 Manchester N/A
603-565 Penacook N/A
603-566 Nashua N/A
603-567 Peterborough N/A
603-568 Concord 8/6/2002
603-569 Wolfeboro N/A
603-570 Portsmouth N/A
603-571 Derry N/A
603-573 Concord N/A
603-574 Alstead N/A
603-575 Littleton N/A
603-576 Orford N/A
603-577 Nashua N/A
603-578 Nashua N/A
603-579 Nashua N/A
603-580 Exeter N/A
603-581 Laconia N/A
603-582 Merrimack N/A
603-583 Exeter N/A
603-584 Concord 6/29/2021
603-585 Fitzwilliam N/A
603-586 Jefferson N/A
603-587 Candia N/A
603-588 Antrim N/A
603-589 Nashua N/A
603-590 Durham N/A
603-591 Manchester N/A
603-592 Spofford N/A
603-593 Jaffrey 6/26/2003
603-594 Nashua N/A
603-595 Nashua N/A
603-596 Nashua N/A
603-597 Lyme N/A
603-598 Nashua N/A
603-599 Nashua N/A
NPANXX Area Served1 Date2
603-600 Manchester 5/29/2020
603-601 Hampton N/A
603-602 Rochester 12/4/2020
603-604 Rye Beach N/A
603-605 Dover N/A
603-606 Manchester N/A
603-607 West Chesterfield 8/13/2020
603-608 Northwood 1/22/2002
603-609 Dover N/A
603-610 Portsmouth N/A
603-612 Plaistow N/A
603-613 Colebrook N/A
603-614 West Chesterfield N/A
603-615 Manchester N/A
603-616 Littleton N/A
603-617 Dover N/A
603-618 Pike N/A
603-619 Laconia 9/1/2022
603-620 Merrimack N/A
603-621 Manchester N/A
603-622 Manchester N/A
603-623 Manchester N/A
603-624 Manchester N/A
603-625 Manchester N/A
603-626 Manchester N/A
603-627 Manchester N/A
603-628 Manchester N/A
603-629 Manchester N/A
603-630 Laconia 1/22/2002
603-631 Lancaster 2/22/2002
603-632 Enfield N/A
603-633 Manchester 5/21/2001
603-634 Manchester N/A
603-635 Pelham N/A
603-636 Groveton N/A
603-637 Bedford N/A
603-638 Monroe N/A
603-639 Manchester N/A
603-640 Hanover N/A
603-641 Manchester N/A
603-642 Kingston N/A
603-643 Hanover N/A
603-644 Manchester N/A
603-645 Manchester N/A
603-646 Hanover N/A
603-647 Manchester N/A
603-648 Salisbury N/A
603-649 Jaffrey 9/29/2022
603-650 Hanover N/A
603-651 Center Ossipee N/A
603-652 Milton N/A
603-653 Hanover N/A
603-654 Wilton N/A
603-655 Manchester N/A
603-656 Manchester N/A
603-657 Manchester N/A
603-658 Exeter N/A
603-659 Newmarket N/A
603-660 Goffstown 2/22/2002
603-661 Manchester N/A
603-662 Conway N/A
603-663 Manchester N/A
603-664 Barrington N/A
603-665 Manchester N/A
603-666 Manchester N/A
603-667 Lebanon N/A
603-668 Manchester N/A
603-669 Manchester N/A
603-670 Merrimack N/A
603-671 Franklin N/A
603-672 Milford N/A
603-673 Milford N/A
603-674 Manchester N/A
603-675 Plainfield N/A
603-676 Hanover N/A
603-677 Meredith N/A
603-678 Lebanon N/A
603-679 Epping N/A
603-680 Hillsboro N/A
603-681 Salem N/A
603-682 Manchester N/A
603-683 Merrimack N/A
603-684 Lancaster N/A
603-685 Salem N/A
603-686 Exeter 9/12/2002
603-687 Jackson N/A
603-688 Concord 2/24/2021
603-689 Nashua N/A
603-690 Claremont N/A
603-691 Exeter 9/13/2022
603-692 Somersworth N/A
603-693 Epping N/A
603-694 Chatham N/A
603-695 Manchester N/A
603-696 Manchester 5/17/2021
603-697 Dover 10/6/2022
603-698 Manchester 06/16/2023
603-699 Nashua 06/16/2023
NPANXX Area Served1 Date2
603-701 New Durham 10/22/2009
603-702 Kingston 7/8/2002
603-703 Manchester 8/18/2004
603-704 Derry N/A
603-705 Salisbury 11/17/2009
603-706 Raymond N/A
603-707 Meredith 7/28/2004
603-708 Canterbury 2/18/2005
603-709 Plainfield 8/17/2004
603-710 Washington 3/2/2021
603-712 Pike N/A
603-713 Nashua 9/13/2022
603-714 Bedford 11/19/2001
603-715 Concord N/A
603-716 Manchester 6/4/2008
603-717 Concord N/A
603-718 Nashua 5/8/2009
603-719 Keene N/A
603-720 Troy 02/27/2023
603-721 Milford 7/8/2002
603-722 Manchester 5/14/2008
603-723 Berlin N/A
603-724 Concord N/A
603-725 Tamworth N/A
603-726 Campton N/A
603-727 Lebanon N/A
603-728 North Woodstock N/A
603-729 Tilton N/A
603-730 North Conway N/A
603-731 Concord N/A
603-732 Milford N/A
603-733 North Conway N/A
603-734 Epping N/A
603-735 Andover N/A
603-736 Epsom N/A
603-737 Laconia N/A
603-738 Concord N/A
603-739 North Woodstock N/A
603-740 Dover N/A
603-741 New Boston N/A
603-742 Dover N/A
603-743 Dover N/A
603-744 Bristol N/A
603-745 North Woodstock N/A
603-746 Contoocook N/A
603-747 Woodsville N/A
603-748 Warner 6/20/2003
603-749 Dover N/A
603-750 Dover N/A
603-751 Pelham N/A
603-752 Berlin N/A
603-753 Penacook N/A
603-754 Lancaster N/A
603-755 Farmington N/A
603-756 Walpole N/A
603-757 Keene N/A
603-758 Hampton N/A
603-759 Nashua N/A
603-760 Seabrook 5/20/2002
603-761 Littleton N/A
603-762 Keene N/A
603-763 Sunapee N/A
603-764 Warren N/A
603-765 Nashua N/A
603-766 Portsmouth N/A
603-767 Dover N/A
603-768 Danbury N/A
603-769 Milford N/A
603-770 Exeter N/A
603-771 Manchester N/A
603-772 Exeter N/A
603-773 Exeter N/A
603-774 Dunbarton N/A
603-775 Exeter N/A
603-776 Barnstead N/A
603-777 Exeter N/A
603-778 Exeter N/A
603-779 Plymouth N/A
603-780 Canaan N/A
603-781 Dover N/A
603-782 Manchester N/A
603-783 Canterbury N/A
603-784 Peterborough N/A
603-785 Manchester N/A
603-786 Rumney N/A
603-787 Woodsville N/A
603-788 Lancaster N/A
603-789 Danbury N/A
603-790 West Lebanon 5/20/2002
603-791 Nashua N/A
603-792 Manchester N/A
603-793 Exeter 5/20/2002
603-794 Laconia 08/11/2023
603-795 Lyme N/A
603-796 Boscawen N/A
603-797 Plaistow N/A
603-798 Chichester N/A
603-799 Manchester N/A
NPANXX Area Served1 Date2
603-800 Meredith 12/9/2019
603-801 Milford 3/16/2001
603-802 Concord 9/13/2022
603-803 Keene 10/20/2016
603-804 Dover 08/31/2023
603-805 Concord 10/17/2023
603-808 Antrim 11/23/2009
603-809 Nashua 3/13/2007
603-810 Nashua 6/1/2021
603-812 Portsmouth N/A
603-813 Center Barnstead 10/30/2009
603-814 Seabrook 7/30/2010
603-815 Durham 12/6/2007
603-816 Nashua N/A
603-817 Dover 12/19/2001
603-818 Derry 7/8/2002
603-819 Plaistow N/A
603-820 Merrimack 3/10/2008
603-821 Nashua N/A
603-822 Rochester N/A
603-823 Franconia N/A
603-824 Salem N/A
603-825 Manchester 1/13/2022
603-826 Charlestown N/A
603-827 Harrisvl N/A
603-828 Portsmouth 1/22/2002
603-829 Sunapee N/A
603-831 Greenfield 12/14/2004
603-832 Laconia N/A
603-833 Rochester 10/5/2004
603-834 Dover N/A
603-835 Alstead N/A
603-836 Manchester 5/20/2002
603-837 Whitefield N/A
603-838 Lisbon N/A
603-839 Farmington N/A
603-840 Epsom 11/16/2009
603-841 Somersworth N/A
603-842 Dover N/A
603-843 Newport N/A
603-845 Derry N/A
603-846 Twin Mountain N/A
603-847 Sullivan N/A
603-848 Concord N/A
603-850 Lisbon 9/20/2021
603-851 Manchester N/A
603-852 Keene N/A
603-853 Woodsville N/A
603-854 Manchester 12/6/2002
603-855 Alton 10/30/2009
603-856 Concord N/A
603-857 Suncook 4/21/2022
603-858 Manchester N/A
603-859 New Durham N/A
603-860 Manchester N/A
603-861 Tamworth N/A
603-862 Durham 4/26/2001
603-863 Newport N/A
603-864 Nashua N/A
603-865 Newport N/A
603-866 Dover N/A
603-867 Manchester N/A
603-868 Durham N/A
603-869 Bethlehem N/A
603-870 Salem N/A
603-871 Sanbornville N/A
603-872 Gilmanton Iron Works 10/30/2009
603-873 Sunapee N/A
603-874 Monroe N/A
603-875 Alton N/A
603-876 Marlborogh N/A
603-877 New London 11/17/2009
603-878 Greenville N/A
603-879 Nashua N/A
603-880 Nashua N/A
603-881 Nashua N/A
603-882 Nashua N/A
603-883 Nashua N/A
603-884 Nashua N/A
603-885 Nashua N/A
603-886 Nashua N/A
603-887 Chester N/A
603-888 Nashua N/A
603-889 Nashua N/A
603-890 Salem N/A
603-891 Nashua N/A
603-892 Concord N/A
603-893 Salem N/A
603-894 Salem N/A
603-895 Raymond N/A
603-896 Salem N/A
603-897 Nashua N/A
603-898 Salem N/A
603-899 Rindge N/A
NPANXX Area Served1 Date2
603-900 Newport 6/15/2020
603-901 Conway 2/26/2016
603-902 Sutton 11/17/2009
603-903 Keene N/A
603-904 Walpole 8/22/2005
603-905 Barrington 9/20/2006
603-906 Barnstead 10/30/2009
603-910 Hampton N/A
603-912 Salem N/A
603-913 Merrimack N/A
603-915 Gorham 2/22/2002
603-916 Hanover 03/24/2023
603-918 Hampton 4/19/2002
603-919 Rochester 07/05/2023
603-921 Nashua 7/6/2009
603-922 North Stratford N/A
603-923 Rochester N/A
603-924 Peterborough N/A
603-925 Peterborough N/A
603-926 Hampton N/A
603-927 Sutton N/A
603-928 Suncook N/A
603-929 Hampton N/A
603-930 Nashua N/A
603-931 Concord 5/21/2015
603-932 Manchester 8/20/2008
603-933 Greenfield 7/7/2008
603-934 Franklin N/A
603-935 Manchester 3/27/2006
603-937 Meredith 6/6/2008
603-938 Bradford N/A
603-939 East Conway N/A
603-941 Wolfeboro N/A
603-942 Northwood N/A
603-943 Nashua N/A
603-944 South Hampton 12/19/2001
603-945 Manchester 8/1/2007
603-947 Plymouth N/A
603-948 Rochester 2/26/2008
603-951 Milan N/A
603-952 Salem N/A
603-953 Dover N/A
603-956 Portsmouth 7/21/2022
603-957 Portsmouth 1/22/2002
603-960 Campton 1/22/2008
603-961 Chichester 11/17/2009
603-964 Rye Beach N/A
603-965 Derry N/A
603-966 Nashua 2/22/2002
603-967 Hampton N/A
603-968 Ashland N/A
603-969 Portsmouth 5/20/2002
603-970 Dover 3/22/2006
603-971 Rindge N/A
603-973 Rochester 5/20/2002
603-974 Plaistow N/A
603-975 Boscawen 11/16/2009
603-977 Andover 11/17/2009
603-978 Dover 3/16/2001
603-986 North Conway 4/19/2002
603-988 Portsmouth 10/17/2001
603-989 Pike N/A
603-991 Littleton 2/22/2002
603-992 Danbury N/A
603-994 Rochester N/A
603-995 Henniker 8/9/2002
603-996 Plymouth 8/9/2002
603-997 Hampton 8/9/2002
603-998 Laconia 7/8/2002
603-999 Salem 12/9/2019
  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.
  3. NXX prefixes last updated: March 1st, 2025

Cities in area code 603

City1 County Time Zone2
Acworth Sullivan E
Alstead Cheshire E
Alton Belknap E
Alton Bay Belknap E
Amherst Hillsborough E
Andover Merrimack E
Antrim Hillsborough E
Ashland Grafton E
Ashuelot Cheshire E
Atkinson Rockingham E
Auburn Rockingham E
Barnstead Belknap E
Barrington Strafford E
Bartlett Carroll E
Bath Grafton E
Bedford Hillsborough E
Belmont Belknap E
Bennington Hillsborough E
Berlin Coos E
Bethlehem Grafton E
Boscawen Merrimack E
Bow Merrimack E
Bradford Merrimack E
Bretton Woods Coos E
Bristol Grafton E
Brookline Hillsborough E
Campton Grafton E
Canaan Grafton E
Candia Rockingham E
Canterbury Merrimack E
Center Barnstead Belknap E
Center Conway Carroll E
Center Harbor Belknap E
Center Ossipee Carroll E
Center Sandwich Carroll E
Center Strafford Strafford E
Center Tuftonboro Carroll E
Charlestown Sullivan E
Chester Rockingham E
Chesterfield Cheshire E
Chichester Merrimack E
Chocorua Carroll E
Claremont Sullivan E
Colebrook Coos E
Concord Merrimack E
Contoocook Merrimack E
Conway Carroll E
Cornish Sullivan E
Cornish Flat Sullivan E
Danbury Merrimack E
Danville Rockingham E
Deerfield Rockingham E
Derry Rockingham E
Dover Strafford E
Drewsville Cheshire E
Dublin Cheshire E
Dunbarton Merrimack E
Durham Strafford E
East Andover Merrimack E
East Candia Rockingham E
East Derry Rockingham E
East Hampstead Rockingham E
East Kingston Rockingham E
East Wakefield Carroll E
Eaton Center Carroll E
Effingham Carroll E
Elkins Merrimack E
Enfield Grafton E
Enfield Center Grafton E
Epping Rockingham E
Epsom Merrimack E
Errol Coos E
Etna Grafton E
Exeter Rockingham E
Farmington Strafford E
Fitzwilliam Cheshire E
Francestown Hillsborough E
Franconia Grafton E
Franklin Merrimack E
Freedom Carroll E
Fremont Rockingham E
Georges Mills Sullivan E
Gilford Belknap E
Gilmanton Belknap E
Gilmanton Iron Works Belknap E
Gilsum Cheshire E
Glen Carroll E
Glencliff Grafton E
Goffstown Hillsborough E
Gorham Coos E
Goshen Sullivan E
Grafton Grafton E
Grantham Sullivan E
Greenfield Hillsborough E
Greenland Rockingham E
Greenville Hillsborough E
Groveton Coos E
Guild Sullivan E
Hampstead Rockingham E
Hampton Rockingham E
Hampton Falls Rockingham E
Hancock Hillsborough E
Hanover Grafton E
Harrisville Cheshire E
Haverhill Grafton E
Hebron Grafton E
Henniker Merrimack E
Hill Merrimack E
Hillsborough Hillsborough E
Hinsdale Cheshire E
Holderness Grafton E
Hollis Hillsborough E
Hooksett Merrimack E
Hopkinton Merrimack E
Hudson Hillsborough E
Intervale Carroll E
Jackson Carroll E
Jaffrey Cheshire E
Jefferson Coos E
Kearsarge Carroll E
Keene Cheshire E
Kingston Rockingham E
Laconia Belknap E
Lancaster Coos E
Lebanon Grafton E
Lee Strafford E
Lempster Sullivan E
Lincoln Grafton E
Lisbon Grafton E
Litchfield Hillsborough E
Littleton Grafton E
Lochmere Belknap E
Londonderry Rockingham E
Loudon Merrimack E
Lyme Grafton E
Lyme Center Grafton E
Lyndeborough Hillsborough E
Madbury Strafford E
Madison Carroll E
Manchester Hillsborough E
Marlborough Cheshire E
Marlow Cheshire E
Melvin Village Carroll E
Meredith Belknap E
Meriden Sullivan E
Merrimack Hillsborough E
Milan Coos E
Milford Hillsborough E
Milton Strafford E
Milton Mills Strafford E
Mirror Lake Carroll E
Monroe Grafton E
Mont Vernon Hillsborough E
Moultonborough Carroll E
Mount Washington Coos E
Nashua Hillsborough E
Nelson Cheshire E
New Boston Hillsborough E
New Castle Rockingham E
New Durham Strafford E
New Hampton Belknap E
New Ipswich Hillsborough E
New London Merrimack E
Newbury Merrimack E
Newfields Rockingham E
Newington Strafford E
Newmarket Rockingham E
Newport Sullivan E
Newton Rockingham E
Newton Junction Rockingham E
North Conway Carroll E
North Hampton Rockingham E
North Haverhill Grafton E
North Salem Rockingham E
North Sandwich Carroll E
North Stratford Coos E
North Sutton Merrimack E
North Walpole Cheshire E
North Woodstock Grafton E
Northwood Rockingham E
Nottingham Rockingham E
Orford Grafton E
Ossipee Carroll E
Pelham Hillsborough E
Peterborough Hillsborough E
Piermont Grafton E
Pike Grafton E
Pittsburg Coos E
Pittsfield Merrimack E
Plainfield Sullivan E
Plaistow Rockingham E
Plymouth Grafton E
Portsmouth Rockingham E
Randolph Coos E
Raymond Rockingham E
Rindge Cheshire E
Rochester Strafford E
Rollinsford Strafford E
Rumney Grafton E
Rye Rockingham E
Rye Beach Rockingham E
Salem Rockingham E
Salisbury Merrimack E
Sanbornton Belknap E
Sanbornville Carroll E
Sandown Rockingham E
Seabrook Rockingham E
Silver Lake Carroll E
Somersworth Strafford E
South Acworth Sullivan E
South Newbury Merrimack E
South Sutton Merrimack E
South Tamworth Carroll E
Spofford Cheshire E
Springfield Sullivan E
Stinson Lake Grafton E
Stoddard Cheshire E
Strafford Strafford E
Stratham Rockingham E
Sugar Hill Grafton E
Sullivan Cheshire E
Sunapee Sullivan E
Suncook Merrimack E
Swanzey Cheshire E
Tamworth Carroll E
Temple Hillsborough E
Thornton Grafton E
Tilton Belknap E
Troy Cheshire E
Twin Mountain Coos E
Union Strafford E
Walpole Cheshire E
Warner Merrimack E
Warren Grafton E
Washington Sullivan E
Waterville Valley Grafton E
Weare Hillsborough E
Wentworth Grafton E
West Chesterfield Cheshire E
West Lebanon Grafton E
West Nottingham Rockingham E
West Ossipee Carroll E
West Peterborough Hillsborough E
West Stewartstown Coos E
West Swanzey Cheshire E
Westmoreland Cheshire E
Whitefield Coos E
Wilmot Merrimack E
Wilton Hillsborough E
Winchester Cheshire E
Windham Rockingham E
Winnisquam Belknap E
Wolfeboro Carroll E
Wolfeboro Falls Carroll E
Wonalancet Carroll E
Woodstock Grafton E
Woodsville Grafton E
  1. Listed above are most places served by USA area code 603. 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 (currently ).
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