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Area Code 203

Area code 203 is in Connecticut, USA, spanning 3 counties and serving 67 cities, including Bridgeport, New Haven or Stamford; it currently uses 777 prefixes, assigned from 203-200-XXXX through 203-999-XXXX.

In service since January 01, 1947, area code 203 is the parent Numbering Plan Area in overlay complex 203/475.

The current local time is 01:16:03 PM (Eastern Time Zone).

203 area code location on a map

*For exact NPA boundaries see official 203 area code map

More Connecticut area codes:

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Locate any 203-NXX prefix:

NPANXX Area served1 Date2
203-200 New Haven 8/14/2008
203-201 New Haven N/A
203-202 Darien N/A
203-204 Guilford N/A
203-205 Danbury N/A
203-206 Waterbury N/A
203-207 Danbury N/A
203-208 Branford N/A
203-209 Bridgeport N/A
203-210 Wilton N/A
203-212 Bridgeport 10/23/2008
203-213 Meriden N/A
203-214 New Haven N/A
203-215 New Haven N/A
203-216 Westport N/A
203-217 Waterbury N/A
203-218 Bridgeport N/A
203-219 Stamford N/A
203-220 Trumbull N/A
203-221 Westport N/A
203-222 Westport N/A
203-223 Stamford N/A
203-224 Bridgeport N/A
203-225 Huntington N/A
203-226 Westport N/A
203-227 Westport N/A
203-228 Waterbury 10/4/2002
203-229 Norwalk N/A
203-230 New Haven N/A
203-231 Ansonia/ Derby N/A
203-232 Waterbury N/A
203-233 Waterbury N/A
203-234 New Haven N/A
203-235 Meriden N/A
203-236 Waterbury N/A
203-237 Meriden N/A
203-238 Meriden N/A
203-239 New Haven N/A
203-240 Danbury N/A
203-241 Danbury N/A
203-242 Huntington N/A
203-243 Bridgeport N/A
203-244 Ridgefield 3/28/2003
203-245 Madison N/A
203-246 Norwalk N/A
203-247 Norwalk N/A
203-248 New Haven N/A
203-249 Stamford N/A
203-250 Cheshire N/A
203-251 Stamford N/A
203-252 Stamford N/A
203-253 Stamford N/A
203-254 Fairfield N/A
203-255 Fairfield N/A
203-256 Fairfield N/A
203-257 Bridgeport N/A
203-258 Bridgeport N/A
203-259 Fairfield N/A
203-260 Bridgeport N/A
203-261 Trumbull N/A
203-262 Woodbury N/A
203-263 Woodbury N/A
203-264 Woodbury N/A
203-265 Wallingford N/A
203-266 Woodbury N/A
203-267 Woodbury N/A
203-268 Trumbull N/A
203-269 Wallingford N/A
203-270 Newtown N/A
203-271 Cheshire N/A
203-272 Cheshire N/A
203-273 Stamford 10/22/2002
203-274 Stamford N/A
203-275 Bridgeport N/A
203-276 Stamford 3/28/2003
203-277 Old Greenwich 4/16/2003
203-278 Ansonia/ Derby 5/1/2001
203-279 Bridgeport N/A
203-280 Darien 3/24/2004
203-281 New Haven N/A
203-282 Stamford N/A
203-283 Milford N/A
203-284 Wallingford N/A
203-285 New Haven N/A
203-286 Norwalk N/A
203-287 New Haven N/A
203-288 New Haven N/A
203-289 Danbury N/A
203-290 Bridgeport 11/14/2013
203-291 Westport N/A
203-292 Fairfield N/A
203-293 Westport N/A
203-294 Wallingford N/A
203-295 Norwalk N/A
203-296 Bridgeport N/A
203-297 Danbury N/A
203-298 New Haven N/A
203-299 Norwalk N/A

NPANXX Area served1 Date2
203-300 Danbury 10/25/2001
203-301 Milford N/A
203-302 Greenwich N/A
203-303 Wallingford N/A
203-304 Newtown N/A
203-305 Ansonia/ Derby N/A
203-306 Milford N/A
203-307 Fairfield 1/31/2005
203-308 Ansonia/ Derby 10/22/2008
203-309 Darien 9/11/2007
203-310 New Canaan 4/16/2003
203-312 Danbury N/A
203-313 Danbury N/A
203-314 New Haven N/A
203-315 Branford N/A
203-316 Stamford N/A
203-317 Meriden N/A
203-318 Madison N/A
203-319 Fairfield N/A
203-320 Darien 4/16/2003
203-321 Stamford N/A
203-322 Stamford N/A
203-323 Stamford N/A
203-324 Stamford N/A
203-325 Stamford N/A
203-326 Stamford N/A
203-327 Stamford N/A
203-328 Stamford N/A
203-329 Stamford N/A
203-330 Bridgeport N/A
203-331 Bridgeport N/A
203-332 Bridgeport N/A
203-333 Bridgeport N/A
203-334 Bridgeport N/A
203-335 Bridgeport N/A
203-336 Bridgeport N/A
203-337 Bridgeport N/A
203-338 Bridgeport N/A
203-339 Bridgeport N/A
203-340 Greenwich 8/19/2003
203-341 Westport N/A
203-342 Bridgeport N/A
203-343 Ansonia/ Derby 1/18/2012
203-344 Old Greenwich N/A
203-345 Bridgeport N/A
203-346 Waterbury N/A
203-347 Byram 3/11/2004
203-348 Stamford N/A
203-349 Westport N/A
203-350 Madison N/A
203-351 Stamford N/A
203-352 Stamford N/A
203-353 Stamford N/A
203-354 Norwalk N/A
203-355 Stamford N/A
203-356 Stamford N/A
203-357 Stamford N/A
203-358 Stamford N/A
203-359 Stamford N/A
203-360 Bridgeport 12/10/2008
203-361 New Haven 12/16/2010
203-362 Bridgeport N/A
203-363 Stamford N/A
203-364 Newtown N/A
203-365 Bridgeport N/A
203-366 Bridgeport N/A
203-367 Bridgeport N/A
203-368 Bridgeport N/A
203-369 Old Greenwich 10/7/2003
203-370 New Haven N/A
203-371 Bridgeport N/A
203-372 Bridgeport N/A
203-373 Bridgeport N/A
203-374 Bridgeport N/A
203-375 Bridgeport N/A
203-376 New Haven N/A
203-377 Bridgeport N/A
203-378 Bridgeport N/A
203-379 Meriden N/A
203-380 Bridgeport N/A
203-381 Bridgeport N/A
203-382 Bridgeport N/A
203-383 Bridgeport N/A
203-384 Bridgeport N/A
203-385 Bridgeport N/A
203-386 Bridgeport N/A
203-387 New Haven N/A
203-388 Stamford N/A
203-389 New Haven N/A
203-390 New Haven 11/10/2015
203-391 Stamford N/A
203-392 New Haven N/A
203-393 New Haven N/A
203-394 Bridgeport N/A
203-395 Bridgeport N/A
203-396 Bridgeport N/A
203-397 New Haven N/A
203-398 Norwalk N/A
203-399 Stamford N/A

NPANXX Area served1 Date2
203-400 Trumbull 2/19/2002
203-401 New Haven N/A
203-402 Huntington N/A
203-403 Ridgefield N/A
203-404 New Haven N/A
203-405 Woodbury 4/4/2001
203-406 Stamford N/A
203-407 New Haven N/A
203-408 Redding N/A
203-409 Old Greenwich N/A
203-410 New Haven N/A
203-412 New Haven N/A
203-413 Greenwich N/A
203-414 Bridgeport N/A
203-415 New Haven 4/12/2001
203-416 Bridgeport N/A
203-417 Danbury N/A
203-418 Fairfield N/A
203-419 Waterbury N/A
203-420 Meriden N/A
203-421 Madison N/A
203-422 Greenwich N/A
203-423 Wilton N/A
203-424 Darien 6/29/2007
203-425 Stamford N/A
203-426 Newtown N/A
203-427 Meriden N/A
203-428 Stamford N/A
203-429 Westport N/A
203-430 New Haven N/A
203-431 Ridgefield N/A
203-432 New Haven N/A
203-433 Branford N/A
203-434 Norwalk N/A
203-435 New Haven N/A
203-436 New Haven N/A
203-437 Waterbury N/A
203-438 Ridgefield N/A
203-439 Cheshire N/A
203-440 Meriden N/A
203-441 Wolcott N/A
203-442 New Canaan N/A
203-443 Meriden N/A
203-444 New Haven N/A
203-445 Trumbull N/A
203-446 Ansonia/ Derby N/A
203-447 Huntington N/A
203-448 Danbury N/A
203-449 Bridgeport N/A
203-450 Bridgeport 5/12/2008
203-451 Westport N/A
203-452 Trumbull N/A
203-453 Guilford N/A
203-454 Westport N/A
203-455 Bridgeport N/A
203-456 Danbury 12/6/2011
203-457 Guilford N/A
203-458 Guilford N/A
203-459 Trumbull N/A
203-460 Danbury N/A
203-461 Stamford N/A
203-462 Stamford N/A
203-463 Seymour N/A
203-464 New Haven N/A
203-465 Waterbury N/A
203-466 New Haven N/A
203-467 New Haven N/A
203-468 New Haven N/A
203-469 New Haven N/A
203-470 Danbury N/A
203-477 New Haven N/A
203-479 New Haven N/A
203-480 Fairfield N/A
203-481 Branford N/A
203-482 Danbury 3/23/2001
203-483 Branford N/A
203-484 Branford N/A
203-485 Greenwich N/A
203-486 Woodbury N/A
203-487 Stamford 1/3/2001
203-488 Branford N/A
203-489 Greenwich 5/25/2011
203-490 Naugatuck N/A
203-491 Newtown 2/12/2010
203-492 New Haven N/A
203-493 Georgetown N/A
203-494 New Haven N/A
203-495 New Haven N/A
203-496 Greenwich N/A
203-497 New Haven N/A
203-498 New Haven N/A
203-499 New Haven N/A

NPANXX Area served1 Date2
203-500 New Haven 10/25/2001
203-501 Danbury 7/9/2010
203-502 Bridgeport N/A
203-503 New Haven N/A
203-504 Stamford 2/12/2004
203-505 Norwalk N/A
203-506 New Haven N/A
203-507 New Haven N/A
203-508 New Haven 2/3/2005
203-509 Waterbury N/A
203-510 Waterbury N/A
203-512 Danbury N/A
203-513 Huntington N/A
203-514 Meriden N/A
203-515 Norwalk N/A
203-516 Ansonia/ Derby N/A
203-517 Stamford N/A
203-518 Waterbury 7/2/2001
203-519 Waterbury 2/9/2011
203-520 Bridgeport 5/30/2002
203-521 Bridgeport N/A
203-522 Bridgeport N/A
203-523 Norwalk N/A
203-524 Stamford N/A
203-525 Waterbury N/A
203-526 Bridgeport N/A
203-527 Waterbury N/A
203-528 Waterbury N/A
203-529 Wilton N/A
203-530 New Haven N/A
203-531 Byram N/A
203-532 Byram N/A
203-533 Guilford N/A
203-534 Bridgeport N/A
203-535 New Haven N/A
203-536 Stamford N/A
203-537 Meriden N/A
203-538 Huntington N/A
203-539 Stamford N/A
203-540 Bridgeport 1/31/2005
203-541 Stamford N/A
203-542 Greenwich N/A
203-543 Bridgeport N/A
203-544 Georgetown N/A
203-545 Bridgeport N/A
203-546 Danbury N/A
203-547 Stamford N/A
203-548 Stamford 5/30/2002
203-549 Bridgeport N/A
203-550 Stamford N/A
203-551 Bridgeport N/A
203-552 Byram N/A
203-553 New Haven N/A
203-554 Stamford N/A
203-556 Bridgeport N/A
203-557 Westport N/A
203-558 Waterbury N/A
203-559 Darien N/A
203-560 Waterbury N/A
203-561 Stamford N/A
203-562 New Haven N/A
203-563 Wilton N/A
203-564 Stamford N/A
203-565 Waterbury N/A
203-566 Stamford 2/4/2003
203-567 Huntington N/A
203-568 Waterbury N/A
203-569 Stamford N/A
203-570 Stamford 3/26/2001
203-571 Westport N/A
203-572 Bridgeport 7/13/2007
203-573 Waterbury N/A
203-574 Waterbury N/A
203-575 Waterbury N/A
203-576 Bridgeport N/A
203-577 Waterbury N/A
203-578 Waterbury N/A
203-579 Bridgeport N/A
203-580 Byram 10/2/2012
203-581 Bridgeport N/A
203-582 New Haven N/A
203-583 Bridgeport N/A
203-584 New Haven 7/9/2010
203-585 Stamford N/A
203-586 Woodbury N/A
203-587 Georgetown N/A
203-588 Stamford N/A
203-589 New Haven N/A
203-590 Trumbull 3/18/2011
203-591 Waterbury N/A
203-592 Waterbury N/A
203-593 Norwalk N/A
203-594 New Canaan N/A
203-595 Stamford N/A
203-596 Waterbury N/A
203-597 Waterbury N/A
203-598 Waterbury N/A
203-599 Meriden N/A

NPANXX Area served1 Date2
203-600 Meriden 10/3/2008
203-601 Trumbull N/A
203-602 Stamford N/A
203-603 New Haven N/A
203-604 Norwalk 3/14/2001
203-605 New Haven N/A
203-606 New Haven N/A
203-607 Stamford 2/4/2003
203-608 Meriden N/A
203-609 Stamford N/A
203-610 Bridgeport N/A
203-612 Bridgeport N/A
203-613 Norwalk N/A
203-614 Stamford N/A
203-615 Bridgeport N/A
203-616 Danbury N/A
203-617 Danbury 9/5/2006
203-618 Greenwich N/A
203-619 New Haven N/A
203-620 Darien 7/19/2004
203-621 Darien N/A
203-622 Greenwich N/A
203-623 New Haven N/A
203-624 New Haven N/A
203-625 Greenwich N/A
203-626 Wallingford N/A
203-627 New Haven N/A
203-628 Danbury N/A
203-629 Greenwich N/A
203-630 Meriden N/A
203-631 Meriden N/A
203-632 Naugatuck N/A
203-633 Wolcott N/A
203-634 Meriden N/A
203-635 Westport N/A
203-636 Darien 9/14/2004
203-637 Old Greenwich N/A
203-638 Trumbull N/A
203-639 Meriden N/A
203-640 New Haven N/A
203-641 New Haven N/A
203-642 Norwalk N/A
203-643 Branford N/A
203-644 Norwalk N/A
203-645 New Haven N/A
203-646 Branford N/A
203-647 Milford N/A
203-648 Danbury N/A
203-649 Cheshire N/A
203-650 Bridgeport 3/26/2001
203-651 Cheshire N/A
203-652 New Canaan N/A
203-653 Stamford N/A
203-654 New Haven N/A
203-655 Darien N/A
203-656 Darien N/A
203-657 New Haven N/A
203-658 Stamford N/A
203-659 Fairfield N/A
203-660 Byram 1/3/2001
203-661 Greenwich N/A
203-662 Darien N/A
203-663 Norwalk N/A
203-664 Redding N/A
203-665 Wilton N/A
203-666 Bridgeport 9/26/2013
203-667 Stamford N/A
203-668 New Haven N/A
203-669 Darien N/A
203-670 Fairfield 12/6/2021
203-671 New Haven N/A
203-672 New Haven N/A
203-673 Bridgeport N/A
203-674 Stamford N/A
203-675 New Haven N/A
203-676 New Haven N/A
203-677 Wallingford N/A
203-678 Wallingford N/A
203-679 Wallingford N/A
203-680 New Haven 10/31/2012
203-681 Byram N/A
203-682 Westport N/A
203-683 Bridgeport N/A
203-684 New Haven 10/3/2008
203-685 Bridgeport 3/30/2001
203-686 Meriden N/A
203-687 New Haven N/A
203-688 New Haven N/A
203-689 Guilford N/A
203-690 Bridgeport 3/21/2008
203-691 New Haven N/A
203-692 Fairfield N/A
203-693 Milford 7/13/2010
203-694 Meriden N/A
203-695 Waterbury N/A
203-696 Bridgeport N/A
203-697 Wallingford N/A
203-698 Old Greenwich N/A
203-699 Cheshire N/A

NPANXX Area served1 Date2
203-701 Milford N/A
203-702 Danbury N/A
203-703 Stamford N/A
203-704 Wolcott 7/17/2002
203-705 Stamford N/A
203-706 Waterbury 2/12/2004
203-707 Waterbury 3/10/2011
203-708 Stamford N/A
203-709 Waterbury N/A
203-710 New Haven N/A
203-712 Huntington N/A
203-713 Milford N/A
203-714 Naugatuck N/A
203-715 Meriden N/A
203-716 New Canaan N/A
203-717 Greenwich 1/28/2011
203-718 Cheshire N/A
203-719 Stamford N/A
203-720 Naugatuck N/A
203-721 Waterbury N/A
203-722 Norwalk N/A
203-723 Naugatuck N/A
203-724 Stamford N/A
203-725 Waterbury N/A
203-726 Bridgeport 9/8/2010
203-727 Bridgeport 6/5/2001
203-728 Stamford 11/22/2006
203-729 Naugatuck N/A
203-730 Danbury N/A
203-731 Danbury N/A
203-732 Ansonia/ Derby N/A
203-733 Danbury N/A
203-734 Ansonia/ Derby N/A
203-735 Ansonia/ Derby N/A
203-736 Ansonia/ Derby N/A
203-737 New Haven N/A
203-738 Guilford N/A
203-739 Danbury N/A
203-740 Danbury N/A
203-741 Wallingford N/A
203-742 Greenwich 4/10/2003
203-743 Danbury N/A
203-744 Danbury N/A
203-745 New Haven N/A
203-746 Danbury N/A
203-747 New Haven N/A
203-748 Danbury N/A
203-749 Danbury N/A
203-750 Norwalk N/A
203-751 Ansonia/ Derby N/A
203-752 New Haven N/A
203-753 Waterbury N/A
203-754 Waterbury N/A
203-755 Waterbury N/A
203-756 Waterbury N/A
203-757 Waterbury N/A
203-758 Waterbury N/A
203-759 Waterbury N/A
203-760 Bridgeport 4/16/2012
203-761 Wilton N/A
203-762 Wilton N/A
203-763 Fairfield N/A
203-764 New Haven N/A
203-765 New Haven N/A
203-766 New Haven N/A
203-767 Bridgeport N/A
203-768 Waterbury N/A
203-769 Greenwich N/A
203-770 Danbury N/A
203-771 New Haven N/A
203-772 New Haven N/A
203-773 New Haven N/A
203-774 Wallingford N/A
203-775 Danbury N/A
203-776 New Haven N/A
203-777 New Haven N/A
203-778 Danbury N/A
203-779 Madison N/A
203-780 New Haven 10/2/2012
203-781 New Haven N/A
203-782 New Haven N/A
203-783 Milford N/A
203-784 New Haven N/A
203-785 New Haven N/A
203-786 New Haven N/A
203-787 New Haven N/A
203-788 Danbury N/A
203-789 New Haven N/A
203-790 Danbury N/A
203-791 Danbury N/A
203-792 Danbury N/A
203-793 Wallingford 3/23/2001
203-794 Danbury N/A
203-795 New Haven N/A
203-796 Danbury N/A
203-797 Danbury N/A
203-798 Danbury N/A
203-799 New Haven N/A

NPANXX Area served1 Date2
203-800 New Haven 3/10/2011
203-801 New Canaan N/A
203-802 Waterbury 10/3/2008
203-803 Norwalk N/A
203-804 New Haven N/A
203-805 Waterbury N/A
203-806 Cheshire N/A
203-807 Norwalk 1/30/2001
203-808 Waterbury 5/30/2002
203-809 New Haven 11/4/2002
203-810 Norwalk 7/27/2001
203-812 New Haven N/A
203-813 Byram N/A
203-814 Bridgeport N/A
203-815 New Haven N/A
203-816 Trumbull 3/14/2001
203-817 Stamford N/A
203-818 Norwalk N/A
203-819 Waterbury N/A
203-820 Norwalk N/A
203-821 New Haven N/A
203-822 Norwalk N/A
203-823 New Haven N/A
203-824 New Haven N/A
203-825 Danbury N/A
203-826 Danbury N/A
203-827 Old Greenwich 7/19/2004
203-828 Seymour N/A
203-829 Norwalk N/A
203-830 Danbury N/A
203-831 Norwalk N/A
203-832 Stamford 4/6/2006
203-833 New Haven 7/29/2015
203-834 Wilton N/A
203-835 Norwalk N/A
203-836 New Haven 12/6/2011
203-837 Danbury N/A
203-838 Norwalk N/A
203-839 Norwalk N/A
203-840 Norwalk N/A
203-841 Waterbury N/A
203-842 Norwalk N/A
203-843 New Haven N/A
203-844 Fairfield 8/16/2004
203-845 Norwalk N/A
203-846 Norwalk N/A
203-847 Norwalk N/A
203-848 New Haven N/A
203-849 Norwalk N/A
203-850 New Haven 10/3/2008
203-851 Norwalk N/A
203-852 Norwalk N/A
203-853 Norwalk N/A
203-854 Norwalk N/A
203-855 Norwalk N/A
203-856 Norwalk N/A
203-857 Norwalk N/A
203-858 Norwalk N/A
203-859 New Haven N/A
203-861 Greenwich N/A
203-862 Greenwich N/A
203-863 Greenwich N/A
203-864 Bridgeport 3/7/2011
203-865 New Haven N/A
203-866 Norwalk N/A
203-867 New Haven N/A
203-868 New Haven N/A
203-869 Greenwich N/A
203-870 Bridgeport N/A
203-871 Branford N/A
203-872 Cheshire N/A
203-873 Bridgeport 2/7/2007
203-874 Milford N/A
203-875 Darien N/A
203-876 Milford N/A
203-877 Milford N/A
203-878 Milford N/A
203-879 Wolcott N/A
203-880 Trumbull N/A
203-881 Seymour N/A
203-882 Milford N/A
203-883 Stamford N/A
203-884 Guilford N/A
203-885 Danbury 10/30/2006
203-886 Meriden N/A
203-887 New Haven N/A
203-888 Seymour N/A
203-889 New Haven N/A
203-890 Stamford 7/27/2001
203-891 New Haven N/A
203-892 Ansonia/ Derby 11/8/2010
203-893 Ansonia/ Derby 6/29/2007
203-894 Ridgefield N/A
203-895 Trumbull N/A
203-896 Madison N/A
203-897 Stamford 8/20/2008
203-898 Darien 1/31/2005
203-899 Norwalk N/A

NPANXX Area served1 Date2
203-900 Greenwich 2/24/2012
203-901 New Haven N/A
203-902 New Haven N/A
203-903 New Haven N/A
203-904 Norwalk N/A
203-905 Stamford N/A
203-906 Ansonia/ Derby 4/23/2002
203-907 New Haven N/A
203-908 Bridgeport 4/5/2006
203-909 New Haven 5/13/2008
203-910 Waterbury N/A
203-912 Stamford N/A
203-913 Bridgeport N/A
203-914 Stamford 2/24/2012
203-915 New Haven N/A
203-916 Bridgeport 1/30/2001
203-917 Danbury 10/22/2008
203-918 Stamford N/A
203-919 Norwalk N/A
203-920 New Canaan 2/20/2004
203-921 Stamford N/A
203-922 Huntington N/A
203-923 Bridgeport N/A
203-924 Huntington N/A
203-925 Huntington N/A
203-926 Huntington N/A
203-927 New Haven N/A
203-928 New Haven N/A
203-929 Huntington N/A
203-930 Greenwich 3/14/2001
203-931 New Haven N/A
203-932 New Haven N/A
203-933 New Haven N/A
203-934 New Haven N/A
203-935 Meriden N/A
203-936 New Haven 9/12/2008
203-937 New Haven N/A
203-938 Redding N/A
203-939 Norwalk 6/25/2008
203-940 Stamford N/A
203-941 Seymour 9/21/2010
203-942 Danbury N/A
203-943 Norwalk N/A
203-944 Huntington N/A
203-945 Norwalk N/A
203-946 New Haven N/A
203-947 Danbury N/A
203-948 Danbury N/A
203-949 Wallingford N/A
203-951 Milford N/A
203-952 Norwalk N/A
203-953 Bridgeport 7/27/2001
203-954 Ansonia/ Derby N/A
203-955 Fairfield 2/20/2004
203-956 Norwalk 1/30/2001
203-957 Norwalk 5/25/2011
203-960 Stamford 9/15/2008
203-961 Stamford N/A
203-962 Stamford N/A
203-963 Norwalk N/A
203-964 Stamford N/A
203-965 Stamford N/A
203-966 New Canaan N/A
203-967 Stamford N/A
203-968 Stamford N/A
203-969 Stamford N/A
203-970 Norwalk 4/4/2011
203-971 Greenwich N/A
203-972 New Canaan N/A
203-973 Stamford N/A
203-974 New Haven N/A
203-975 Stamford N/A
203-977 Stamford N/A
203-978 Stamford N/A
203-979 Stamford N/A
203-980 New Haven 8/20/2002
203-981 Norwalk N/A
203-982 Waterbury N/A
203-983 Greenwich N/A
203-984 Norwalk N/A
203-985 New Haven N/A
203-986 Old Greenwich 2/20/2004
203-987 Greenwich 3/30/2001
203-988 New Haven N/A
203-989 Stamford N/A
203-990 Old Greenwich 1/31/2005
203-991 Norwalk N/A
203-992 Greenwich 5/12/2006
203-993 Bridgeport 7/20/2006
203-994 Danbury 12/14/2001
203-995 Bridgeport 10/8/2008
203-996 New Haven 12/14/2001
203-997 Ansonia/ Derby 5/18/2011
203-998 Stamford 10/15/2004
203-999 New Haven 3/9/2011
  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 203

City1 County Time2
Ansonia New Haven E
Beacon Falls New Haven E
Bethany New Haven E
Bethel Fairfield E
Bethlehem Litchfield E
Botsford Fairfield E
Branford New Haven E
Bridgeport Fairfield E
Brookfield Fairfield E
Cheshire New Haven E
Cos Cob Fairfield E
Danbury Fairfield E
Darien Fairfield E
Derby New Haven E
East Haven New Haven E
Easton Fairfield E
Fairfield Fairfield E
Georgetown Fairfield E
Greens Farms Fairfield E
Greenwich Fairfield E
Guilford New Haven E
Hamden New Haven E
Hawleyville Fairfield E
Madison New Haven E
Meriden New Haven E
Middlebury New Haven E
Milford New Haven E
Monroe Fairfield E
Naugatuck New Haven E
New Canaan Fairfield E
New Fairfield Fairfield E
New Haven New Haven E
Newtown Fairfield E
North Branford New Haven E
North Haven New Haven E
Northford New Haven E
Norwalk Fairfield E
Old Greenwich Fairfield E
Orange New Haven E
Oxford New Haven E
Prospect New Haven E
Redding Fairfield E
Redding Center Fairfield E
Redding Ridge Fairfield E
Ridgefield Fairfield E
Riverside Fairfield E
Roxbury Litchfield E
Sandy Hook Fairfield E
Seymour New Haven E
Shelton Fairfield E
Sherman Fairfield E
South Britain New Haven E
Southbury New Haven E
Southport Fairfield E
Stamford Fairfield E
Stevenson Fairfield E
Stratford Fairfield E
Trumbull Fairfield E
Wallingford New Haven E
Waterbury New Haven E
West Haven New Haven E
Weston Fairfield E
Westport Fairfield E
Wilton Fairfield E
Wolcott New Haven E
Woodbridge New Haven E
Woodbury Litchfield E
  1. Listed above are most places served by USA area code 203. 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 01:16:03 PM).
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