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312 area code

Area code 312 is in Illinois (IL), USA serving the city of Chicago (downtown area).

Area code 312 has been in service since January 01, 1947 and is the older Numbering Plan Area in overlay complex 312/872 (overlaying area codes cover the same geographic area).

The rest of the city of Chicago is covered by these overlaying area codes: 773/872.

04:41:43 AM is the current time in area code 312 (Central Time).

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Map of area code 312

More Illinois area codes

NPANXX1 Area served2 Date3
312-200 Chicago Zone 01 10/2/2017
312-201 Chicago Zone 01
312-202 Chicago Zone 01
312-203 Chicago Zone 01
312-204 Chicago Zone 01
312-205 Chicago Zone 01
312-206 Chicago Zone 01
312-207 Chicago Zone 01
312-208 Chicago Zone 01
312-209 Northbrook
312-210 Chicago Zone 01 7/19/2018
312-212 Chicago Zone 01
312-213 Chicago Zone 01
312-214 Chicago Zone 01
312-215 Wheeling
312-216 Chicago Zone 01 2/13/2012
312-217 Chicago Zone 01
312-218 Chicago Zone 01
312-219 Chicago Zone 01 4/10/2012
312-220 Chicago Zone 01
312-221 Chicago Zone 01 6/17/2011
312-222 Chicago Zone 01
312-223 Chicago Zone 01
312-224 Chicago Zone 01
312-225 Chicago Zone 01
312-226 Chicago Zone 01
312-227 Chicago Zone 01 9/15/2010
312-228 Chicago Zone 01
312-229 Chicago Zone 01
312-230 Chicago Zone 01
312-231 Roselle
312-232 Chicago Zone 01 4/23/2001
312-233 Chicago Zone 01
312-234 Chicago Zone 01
312-235 Chicago Zone 01
312-236 Chicago Zone 01
312-237 Chicago Zone 01
312-238 Chicago Zone 01
312-239 Chicago Zone 01
312-240 Chicago Zone 01
312-241 Chicago Zone 01 8/17/2011
312-242 Chicago Zone 01
312-243 Chicago Zone 01
312-244 Chicago Zone 01
312-245 Chicago Zone 01
312-246 Wheeling
312-247 Chicago Zone 01 4/6/2004
312-248 Chicago Zone 01 7/1/2014
312-249 Chicago Zone 01
312-250 Chicago Zone 01
312-251 Chicago Zone 01
312-252 Chicago Zone 01
312-253 Chicago Zone 01
312-254 Chicago Zone 01
312-255 Chicago Zone 01
312-256 Chicago Zone 01
312-257 Chicago Zone 01 8/18/2011
312-258 Chicago Zone 01
312-259 Chicago Zone 01
312-260 Chicago Zone 01
312-261 Chicago Zone 01
312-262 Chicago Zone 01
312-263 Chicago Zone 01
312-264 Chicago Zone 01
312-265 Chicago Zone 01 11/29/2005
312-266 Chicago Zone 01
312-267 Chicago Zone 01
312-268 Chicago Zone 01
312-269 Chicago Zone 01
312-270 Chicago Zone 01 1/16/2017
312-271 Chicago Zone 01
312-272 Chicago Zone 01
312-273 Chicago Zone 01 9/13/2011
312-274 Chicago Zone 01
312-275 Chicago Zone 01
312-276 Chicago Zone 01
312-277 Chicago Zone 01
312-278 Chicago Zone 01
312-279 Chicago Zone 01
312-280 Chicago Zone 01
312-281 Chicago Zone 01
312-282 Chicago Zone 01
312-283 Chicago Zone 01
312-284 Chicago Zone 01
312-285 Chicago Zone 01
312-286 Chicago Zone 01
312-287 Chicago Zone 07
312-288 Chicago Zone 01
312-289 Chicago Zone 01
312-290 Chicago Zone 01
312-291 Chicago Zone 01
312-292 Chicago Zone 01 9/2/2011
312-293 Chicago Zone 01
312-294 Chicago Zone 01
312-295 La Grange
312-296 Chicago Zone 01
312-297 Chicago Zone 01
312-298 Chicago Zone 01
312-299 Chicago Zone 01
312-300 Chicago Zone 01
312-301 Hinsdale
312-302 Chicago Zone 01
312-303 Wheeling
312-304 Hinsdale
312-305 Northbrook
312-306 Chicago Zone 01
312-307 Chicago Zone 01
312-308 Chicago Zone 01
312-309 Chicago Zone 01
312-310 Northbrook
312-312 Chicago Zone 01 1/19/2018
312-313 Chicago Zone 01 11/10/2014
312-314 Hinsdale
312-315 Chicago Zone 01
312-316 Chicago Zone 01
312-317 Wheeling
312-318 La Grange
312-319 Chicago Zone 01 4/28/2017
312-320 Chicago Zone 01
312-321 Chicago Zone 01
312-322 Chicago Zone 01
312-323 Chicago Zone 01 4/13/2001
312-324 Chicago Zone 01 5/3/2001
312-325 Chicago Zone 01 6/24/2003
312-326 Chicago Zone 01
312-327 Chicago Zone 01
312-328 Chicago Zone 01
312-329 Chicago Zone 01
312-330 Chicago Zone 01
312-331 Wheeling
312-332 Chicago Zone 01
312-333 Chicago Zone 01 4/13/2001
312-334 Chicago Zone 01
312-335 Chicago Zone 01
312-336 Chicago Zone 01
312-337 Chicago Zone 01
312-338 Chicago Zone 01
312-339 Chicago Zone 01
312-340 Chicago Zone 01
312-341 Chicago Zone 01
312-342 Chicago Zone 01
312-343 Chicago Zone 01
312-344 Chicago Zone 01
312-345 Chicago Zone 01
312-346 Chicago Zone 01
312-347 Chicago Zone 01
312-348 Chicago Zone 01 11/14/2003
312-349 Chicago Zone 01
312-350 Chicago Zone 01
312-351 Chicago Zone 01
312-352 Hinsdale
312-353 Chicago Zone 01
312-354 Roselle
312-355 Chicago Zone 01
312-356 Chicago Zone 01
312-357 Chicago Zone 01
312-358 Chicago Zone 01 7/21/2015
312-359 Chicago Zone 01
312-360 Chicago Zone 01
312-361 Chicago Zone 01
312-362 Chicago Zone 01
312-363 Chicago Zone 01
312-364 Chicago Zone 01
312-365 Chicago Zone 01
312-366 Chicago Zone 01 2/3/2016
312-367 La Grange
312-368 Chicago Zone 01
312-369 Chicago Zone 01
312-370 Chicago Zone 01
312-371 Chicago Zone 01
312-372 Chicago Zone 01
312-373 Chicago Zone 01
312-374 Chicago Zone 01
312-375 Chicago Zone 01
312-376 Chicago Zone 01 6/11/2004
312-377 Chicago Zone 01
312-378 Chicago Zone 01
312-379 Chicago Zone 01 4/10/2001
312-380 Chicago Zone 01
312-381 Chicago Zone 01
312-382 Chicago Zone 01
312-383 Chicago Zone 01 2/1/2016
312-384 Chicago Zone 01
312-385 Chicago Zone 01
312-386 Chicago Zone 01
312-387 Chicago Zone 01
312-388 Chicago Zone 01
312-389 Chicago Zone 01
312-390 Chicago Zone 01 4/16/2001
312-391 Chicago Zone 01
312-392 Chicago Zone 01 10/23/2017
312-393 Chicago Zone 01 4/23/2001
312-394 Chicago Zone 01
312-395 Chicago Zone 01
312-396 Chicago Zone 01
312-397 Chicago Zone 01
312-398 Chicago Zone 01
312-399 Chicago Zone 01
312-400 Chicago Zone 01 4/13/2001
312-401 Chicago Zone 01
312-402 Chicago Zone 01
312-403 La Grange
312-404 Chicago Zone 01 10/14/2002
312-405 Chicago Zone 01
312-406 Wheeling
312-407 Chicago Zone 01
312-408 Chicago Zone 01
312-409 Chicago Zone 01
312-410 Chicago Zone 01
312-412 Wheeling
312-413 Chicago Zone 01
312-414 Chicago Zone 01 8/12/2016
312-415 Chicago Zone 01
312-416 Chicago Zone 01
312-417 Chicago Zone 01
312-418 Chicago Zone 01
312-419 Chicago Zone 01
312-420 Chicago Zone 01
312-421 Chicago Zone 01
312-422 Chicago Zone 01
312-423 Chicago Zone 01
312-424 Chicago Zone 01
312-425 Chicago Zone 01
312-426 Chicago Zone 01
312-427 Chicago Zone 01
312-428 Chicago Zone 01
312-429 Chicago Zone 01
312-430 Chicago Zone 01
312-431 Chicago Zone 01
312-432 Chicago Zone 01
312-433 Chicago Zone 01
312-434 Chicago Zone 01 7/8/2011
312-435 Chicago Zone 01
312-436 Chicago Zone 01
312-437 Chicago Zone 01
312-438 Chicago Zone 01 6/2/2017
312-439 Chicago Zone 01 11/28/2016
312-440 Chicago Zone 01
312-441 Chicago Zone 01
312-442 Chicago Zone 01
312-443 Chicago Zone 01
312-444 Chicago Zone 01
312-445 Chicago Zone 01
312-446 Chicago Zone 01
312-447 Chicago Zone 01
312-448 Chicago Zone 01 8/2/2011
312-449 Chicago Zone 01 4/23/2001
312-450 Chicago Zone 01
312-451 Chicago Zone 01
312-452 Chicago Zone 01 4/13/2001
312-453 Chicago Zone 01
312-454 Chicago Zone 01
312-455 Chicago Zone 01
312-456 Chicago Zone 01
312-457 Chicago Zone 01 4/23/2001
312-458 Chicago Zone 01
312-459 Chicago Zone 01 8/2/2011
312-460 Chicago Zone 01
312-461 Chicago Zone 01
312-462 Chicago Zone 01
312-463 Chicago Zone 01
312-464 Chicago Zone 01
312-465 Chicago Zone 01 3/26/2009
312-466 Chicago Zone 01
312-467 Chicago Zone 01
312-468 Chicago Zone 01 6/26/2015
312-469 Chicago Zone 01
312-470 Chicago Zone 01
312-471 Chicago Zone 01 6/26/2015
312-472 Chicago Zone 01 10/27/2005
312-473 Chicago Zone 01 11/15/2006
312-474 Chicago Zone 01
312-475 Chicago Zone 01
312-476 Chicago Zone 01
312-477 Chicago Zone 01 10/20/2010
312-478 Chicago Zone 01 3/20/2014
312-479 Chicago Zone 01
312-480 Chicago Zone 01
312-481 Chicago Zone 01 7/7/2017
312-482 Chicago Zone 01
312-483 Chicago Zone 01 8/22/2014
312-484 Chicago Zone 01
312-485 Chicago Zone 01
312-486 Chicago Zone 01 4/23/2004
312-487 Chicago Zone 01 10/27/2014
312-488 Chicago Zone 01
312-489 Chicago Zone 01
312-490 Chicago Zone 01
312-491 Chicago Zone 01
312-492 Chicago Zone 01
312-493 Chicago Zone 01
312-494 Chicago Zone 01
312-495 Chicago Zone 01
312-496 Chicago Zone 01
312-497 Chicago Zone 01
312-498 Chicago Zone 01
312-499 Chicago Zone 01
312-500 Chicago Zone 01 5/22/2018
312-501 La Grange
312-502 Chicago Zone 01
312-503 Chicago Zone 01
312-504 Chicago Zone 01
312-505 Chicago Zone 01
312-506 Chicago Zone 01 5/24/2004
312-507 Chicago Zone 01
312-508 Chicago Zone 01 3/19/2012
312-509 Chicago Zone 01 3/6/2012
312-510 Hinsdale
312-512 Chicago Zone 01
312-513 Chicago Zone 01
312-514 Chicago Zone 01 4/13/2001
312-515 Chicago Zone 01
312-516 Chicago Zone 01
312-517 Chicago Zone 01 2/9/2015
312-518 Wheeling
312-519 Chicago Zone 01
312-520 Chicago Zone 01
312-521 Chicago Zone 01
312-522 Chicago Zone 01 8/22/2014
312-523 Chicago Zone 01
312-524 Wheeling
312-525 Chicago Zone 01 3/20/2002
312-526 Chicago Zone 01
312-527 Chicago Zone 01
312-528 Chicago Zone 01
312-529 Chicago Zone 01
312-530 Chicago Zone 01 7/28/2020
312-531 Hinsdale
312-532 Chicago Zone 01
312-533 Chicago Zone 01
312-534 Chicago Zone 01 9/17/2008
312-535 Chicago Zone 01 7/20/2017
312-536 Chicago Zone 01 6/26/2015
312-537 Chicago Zone 01
312-538 Chicago Zone 01 7/21/2017
312-539 Chicago Zone 01 1/11/2016
312-540 Chicago Zone 01
312-541 Chicago Zone 01
312-542 Chicago Zone 01
312-543 Chicago Zone 01
312-544 Chicago Zone 01
312-545 Chicago Zone 01
312-546 Chicago Zone 01
312-547 Chicago Zone 01
312-548 Chicago Zone 01 9/5/2007
312-549 Chicago Zone 01 9/25/2015
312-550 Chicago Zone 01
312-551 Chicago Zone 01
312-552 Chicago Zone 01
312-553 Chicago Zone 01
312-554 Chicago Zone 01
312-556 Chicago Zone 01
312-557 Chicago Zone 01
312-558 Chicago Zone 01
312-559 Chicago Zone 01
312-560 Chicago Zone 01
312-561 Chicago Zone 01 6/20/2012
312-562 Chicago Zone 01
312-563 Chicago Zone 01
312-564 Chicago Zone 01 11/13/2006
312-565 Chicago Zone 01
312-566 Chicago Zone 01
312-567 Chicago Zone 01
312-568 Chicago Zone 01
312-569 Chicago Zone 01
312-570 Chicago Zone 01
312-571 Chicago Zone 01
312-572 Chicago Zone 01
312-573 Chicago Zone 01
312-574 Chicago Zone 01
312-575 Chicago Zone 01
312-576 Chicago Zone 01
312-577 Chicago Zone 01
312-578 Chicago Zone 01
312-579 Chicago Zone 01 7/25/2017
312-580 Chicago Zone 01
312-581 Chicago Zone 01 7/31/2017
312-582 Chicago Zone 01 5/16/2002
312-583 Chicago Zone 01
312-584 Chicago Zone 01 8/14/2018
312-585 Chicago Zone 01 4/16/2013
312-586 Chicago Zone 01 5/4/2016
312-587 Chicago Zone 01
312-588 Chicago Zone 01
312-589 Chicago Zone 01
312-590 Chicago Zone 01
312-591 Chicago Zone 01
312-592 Chicago Zone 01
312-593 Chicago Zone 01
312-594 Chicago Zone 01 11/6/2008
312-595 Chicago Zone 01
312-596 Chicago Zone 01
312-597 Chicago Zone 01 10/4/2016
312-598 Chicago Zone 01 1/24/2019
312-599 Chicago Zone 01 11/21/2016
312-600 Chicago Zone 01 5/1/2012
312-601 Chicago Zone 01
312-602 Chicago Zone 01
312-603 Chicago Zone 01
312-604 Chicago Zone 01
312-605 Chicago Zone 01 8/6/2012
312-606 Chicago Zone 01
312-607 Chicago Zone 01
312-608 Chicago Zone 01
312-609 Chicago Zone 01
312-610 Chicago Zone 01 8/6/2012
312-612 Chicago Zone 01
312-613 Chicago Zone 01
312-614 Chicago Zone 01 10/19/2012
312-615 Wheeling
312-616 Chicago Zone 01
312-617 Chicago Zone 01
312-618 Chicago Zone 01
312-619 Chicago Zone 01 9/11/2012
312-620 Chicago Zone 01 8/15/2012
312-621 Chicago Zone 01
312-622 Chicago Zone 01 2/14/2001
312-623 Chicago Zone 01
312-624 Chicago Zone 01
312-625 Chicago Zone 01 11/12/2001
312-626 Chicago Zone 01 2/4/2008
312-627 Chicago Zone 01
312-628 Chicago Zone 01
312-629 Chicago Zone 01
312-630 Chicago Zone 01
312-631 Chicago Zone 01 1/11/2013
312-632 Chicago Zone 01
312-633 Chicago Zone 01
312-634 Chicago Zone 01
312-635 Chicago Zone 01
312-636 Chicago Zone 01
312-637 Chicago Zone 01
312-638 Chicago Zone 01
312-639 Chicago Zone 01 10/19/2017
312-640 Chicago Zone 01
312-641 Chicago Zone 01
312-642 Chicago Zone 01
312-643 Chicago Zone 01
312-644 Chicago Zone 01
312-645 Chicago Zone 01
312-646 Chicago Zone 01
312-647 Chicago Zone 01 5/24/2013
312-648 Chicago Zone 01
312-649 Chicago Zone 01
312-650 Chicago Zone 01
312-651 Chicago Zone 01
312-652 Chicago Zone 01
312-653 Chicago Zone 01
312-654 Chicago Zone 01
312-655 Chicago Zone 01
312-656 Chicago Zone 01
312-657 Chicago Zone 01
312-658 Chicago Zone 01
312-659 Chicago Zone 01
312-660 Chicago Zone 01
312-661 Chicago Zone 01
312-662 Chicago Zone 01
312-663 Chicago Zone 01
312-664 Chicago Zone 01
312-665 Chicago Zone 01
312-666 Chicago Zone 01
312-667 Chicago Zone 01 8/31/2012
312-668 Chicago Zone 01 5/28/2019
312-669 Chicago Zone 01
312-670 Chicago Zone 01
312-671 Chicago Zone 01
312-672 Chicago Zone 01
312-673 Chicago Zone 01
312-674 Chicago Zone 01
312-675 Chicago Zone 01
312-676 Chicago Zone 01 6/16/2006
312-677 Chicago Zone 01
312-678 Chicago Zone 01 7/25/2013
312-679 Chicago Zone 01 4/23/2001
312-680 Chicago Zone 01
312-681 Chicago Zone 01
312-682 Chicago Zone 01 5/14/2020
312-683 Chicago Zone 01
312-684 Chicago Zone 01 9/13/2016
312-685 Chicago Zone 01
312-686 Chicago Zone 01 12/13/2016
312-687 Chicago Zone 01 9/13/2016
312-688 Chicago Zone 01
312-689 Chicago Zone 01 4/13/2001
312-690 Chicago Zone 01 5/6/2014
312-691 Chicago Zone 01
312-692 Chicago Zone 01
312-693 Chicago Zone 01
312-694 Chicago Zone 01
312-695 Chicago Zone 01
312-696 Chicago Zone 01
312-697 Chicago Zone 01
312-698 Chicago Zone 01 8/23/2001
312-699 Hinsdale
312-701 Chicago Zone 01
312-702 Chicago Zone 01 12/31/2012
312-703 Chicago Zone 01
312-704 Chicago Zone 01
312-705 Chicago Zone 01
312-706 Chicago Zone 01
312-707 Chicago Zone 01
312-709 Chicago Zone 01 5/24/2013
312-710 Chicago Zone 01
312-712 Chicago Zone 01
312-713 Chicago Zone 01 4/16/2001
312-714 Chicago Zone 01
312-715 Chicago Zone 01
312-716 Chicago Zone 01
312-717 La Grange
312-718 Chicago Zone 01
312-719 Chicago Zone 01
312-720 Chicago Zone 01
312-721 Chicago Zone 01 10/22/2013
312-722 Chicago Zone 01 6/1/2015
312-723 Chicago Zone 01 11/28/2016
312-724 Chicago Zone 01 2/7/2013
312-725 Chicago Zone 01 10/8/2008
312-726 Chicago Zone 01
312-727 Chicago Zone 01
312-728 Chicago Zone 01 10/19/2017
312-729 Chicago Zone 01
312-730 Chicago Zone 01
312-731 Chicago Zone 01
312-732 Chicago Zone 01
312-733 Chicago Zone 01
312-734 Chicago Zone 01 9/17/2015
312-735 Chicago Zone 04 7/6/2001
312-736 Chicago Zone 01 10/20/2017
312-737 Chicago Zone 01
312-738 Chicago Zone 01
312-739 Chicago Zone 01
312-740 Chicago Zone 01 4/13/2001
312-741 Chicago Zone 01 10/20/2017
312-742 Chicago Zone 01
312-743 Chicago Zone 01 11/15/2001
312-744 Chicago Zone 01
312-745 Chicago Zone 01
312-746 Chicago Zone 01
312-747 Chicago Zone 01
312-748 Chicago Zone 01
312-749 Hinsdale
312-750 Chicago Zone 01
312-751 Chicago Zone 01
312-752 Chicago Zone 01 4/19/2002
312-753 Chicago Zone 01
312-754 Chicago Zone 01 2/26/2013
312-755 Chicago Zone 01
312-756 Chicago Zone 01
312-757 Chicago Zone 01 3/28/2013
312-758 Chicago Zone 01
312-759 Chicago Zone 01
312-760 Chicago Zone 01 4/13/2001
312-761 Chicago Zone 01 5/25/2018
312-762 Chicago Zone 01
312-763 Chicago Zone 01 5/12/2014
312-764 Chicago Zone 01 10/20/2016
312-765 Chicago Zone 01
312-766 Chicago Zone 01 10/17/2016
312-767 Chicago Zone 01 4/16/2015
312-768 Chicago Zone 01
312-769 Chicago Zone 01
312-770 Chicago Zone 01
312-771 Chicago Zone 01
312-772 Chicago Zone 01 8/18/2008
312-774 Chicago Zone 01 8/19/2013
312-775 Chicago Zone 01
312-776 Chicago Zone 01 1/30/2019
312-777 Chicago Zone 01
312-778 Chicago Zone 01 5/8/2015
312-779 Chicago Zone 01 5/13/2019
312-780 Chicago Zone 01
312-781 Chicago Zone 01
312-782 Chicago Zone 01
312-783 Chicago Zone 01 8/8/2016
312-784 Chicago Zone 01 7/12/2007
312-785 Chicago Zone 01 8/19/2014
312-786 Chicago Zone 01
312-787 Chicago Zone 01
312-788 Chicago Zone 01
312-789 Chicago Zone 01
312-790 Chicago Zone 01
312-791 Chicago Zone 01
312-792 Chicago Zone 01 11/20/2014
312-793 Chicago Zone 01
312-794 Chicago Zone 01
312-795 Chicago Zone 01
312-796 Chicago Zone 01 7/26/2016
312-797 Chicago Zone 01
312-798 Chicago Zone 01
312-799 Chicago Zone 01
312-800 Chicago Zone 01 11/20/2012
312-801 Chicago Zone 01 4/29/2013
312-802 Chicago Zone 01
312-803 Chicago Zone 01
312-804 Chicago Zone 01 1/23/2002
312-805 Chicago Zone 01
312-806 Chicago Zone 01
312-807 Chicago Zone 01
312-808 Chicago Zone 01
312-809 Chicago Zone 01 10/25/2013
312-810 Chicago Zone 01
312-812 Chicago Zone 01
312-813 Chicago Zone 01
312-814 Chicago Zone 01
312-815 Chicago Zone 01 5/7/2018
312-816 Hinsdale
312-817 Chicago Zone 01
312-818 Chicago Zone 01 8/19/2013
312-819 Chicago Zone 01
312-820 Chicago Zone 01 1/8/2020
312-821 Chicago Zone 01
312-822 Chicago Zone 01
312-823 Chicago Zone 01
312-824 Chicago Zone 01 6/20/2016
312-825 Chicago Zone 01 3/17/2016
312-826 Chicago Zone 01 6/17/2016
312-827 Chicago Zone 01
312-828 Chicago Zone 01
312-829 Chicago Zone 01
312-830 Chicago Zone 01
312-831 Chicago Zone 01
312-832 Chicago Zone 01
312-833 Chicago Zone 01
312-834 Chicago Zone 01
312-835 Chicago Zone 01
312-836 Chicago Zone 01
312-837 Chicago Zone 01 9/3/2015
312-838 Chicago Zone 01 1/11/2016
312-839 Chicago Zone 01 4/13/2001
312-840 Chicago Zone 01
312-841 Chicago Zone 01
312-842 Chicago Zone 01
312-843 Chicago Zone 01 3/12/2014
312-844 Hinsdale
312-845 Chicago Zone 01
312-846 Chicago Zone 01
312-847 Chicago Zone 01 6/28/2019
312-848 Chicago Zone 01
312-849 Chicago Zone 01
312-850 Chicago Zone 01
312-851 Chicago Zone 01
312-852 Chicago Zone 01
312-853 Chicago Zone 01
312-854 Chicago Zone 01
312-855 Chicago Zone 01
312-856 Chicago Zone 01
312-857 Chicago Zone 01
312-858 Chicago Zone 01 12/21/2015
312-859 Chicago Zone 01
312-860 Chicago Zone 01
312-861 Chicago Zone 01
312-862 Chicago Zone 01 1/25/2006
312-863 Chicago Zone 01 4/10/2001
312-864 Chicago Zone 01
312-865 Wheeling
312-866 Chicago Zone 01 8/22/2014
312-867 Chicago Zone 01
312-868 Chicago Zone 01 12/4/2015
312-869 Chicago Zone 01
312-870 Chicago Zone 01
312-871 Chicago Zone 01 8/28/2015
312-872 Chicago Zone 01 7/12/2018
312-873 Chicago Zone 01
312-874 Chicago Zone 01 5/22/2015
312-875 Chicago Zone 01
312-876 Chicago Zone 01
312-877 Chicago Zone 01 8/12/2014
312-878 Chicago Zone 01 2/4/2008
312-879 Chicago Zone 01
312-880 Chicago Zone 01
312-881 Chicago Zone 01 4/10/2001
312-882 Chicago Zone 01
312-883 Chicago Zone 01 11/12/2014
312-884 Chicago Zone 01 4/10/2001
312-885 Chicago Zone 01 9/22/2015
312-886 Chicago Zone 01
312-887 Chicago Zone 01
312-888 Chicago Zone 01 1/13/2012
312-889 Chicago Zone 01 6/25/2015
312-890 Chicago Zone 01
312-891 Chicago Zone 01
312-892 Chicago Zone 01
312-893 Chicago Zone 01
312-894 Chicago Zone 01
312-895 Chicago Zone 01
312-896 Chicago Zone 01
312-897 Chicago Zone 01 3/23/2015
312-898 Chicago Zone 01
312-899 Chicago Zone 01
312-900 Chicago Zone 01 1/18/2019
312-901 Chicago Zone 01
312-902 Chicago Zone 01
312-903 Chicago Zone 01 4/13/2001
312-904 Chicago Zone 01
312-905 Chicago Zone 01
312-906 Chicago Zone 01
312-907 Chicago Zone 01
312-908 Chicago Zone 01
312-909 Chicago Zone 01
312-910 Chicago Zone 01
312-912 Chicago Zone 01
312-913 Chicago Zone 01
312-914 Chicago Zone 01
312-915 Chicago Zone 01
312-916 Chicago Zone 01 4/23/2001
312-917 Chicago Zone 01
312-918 Chicago Zone 01 8/19/2013
312-919 Chicago Zone 01
312-920 Chicago Zone 01
312-921 Chicago Zone 01 7/21/2008
312-922 Chicago Zone 01
312-923 Chicago Zone 01
312-924 Chicago Zone 01
312-925 Chicago Zone 01
312-926 Chicago Zone 01
312-927 Chicago Zone 01 8/21/2002
312-928 Chicago Zone 01
312-929 Chicago Zone 01 4/27/2006
312-930 Chicago Zone 01
312-931 Chicago Zone 01
312-932 Chicago Zone 01
312-933 Chicago Zone 01
312-934 Chicago Zone 01 12/8/2014
312-935 Chicago Zone 01
312-936 Chicago Zone 01
312-937 Chicago Zone 01 9/25/2014
312-938 Chicago Zone 01
312-939 Chicago Zone 01
312-940 Chicago Zone 01 9/20/2013
312-941 Chicago Zone 01
312-942 Chicago Zone 01
312-943 Chicago Zone 01
312-944 Chicago Zone 01
312-945 Chicago Zone 01
312-946 Chicago Zone 01
312-947 Chicago Zone 01 11/18/2010
312-948 Chicago Zone 01 4/10/2001
312-949 Chicago Zone 01
312-951 Chicago Zone 01
312-952 Chicago Zone 01
312-953 Chicago Zone 01
312-954 Chicago Zone 01
312-955 Chicago Zone 01
312-956 Chicago Zone 01 9/29/2014
312-957 Chicago Zone 01
312-960 Chicago Zone 01
312-961 Chicago Zone 01
312-962 Chicago Zone 01
312-963 Chicago Zone 01
312-964 Chicago Zone 01
312-965 Chicago Zone 01
312-966 Chicago Zone 01 11/18/2014
312-967 Chicago Zone 01 8/7/2014
312-968 La Grange
312-969 La Grange
312-970 Chicago Zone 01
312-971 Chicago Zone 01 5/1/2014
312-972 Chicago Zone 01
312-973 Chicago Zone 01 2/19/2014
312-974 Chicago Zone 01
312-975 Chicago Zone 01 9/15/2014
312-977 Chicago Zone 01
312-978 Chicago Zone 01 10/22/2013
312-979 Chicago Zone 01
312-980 Chicago Zone 01
312-981 Chicago Zone 01 4/10/2001
312-982 Chicago Zone 01 10/7/2014
312-983 Chicago Zone 01
312-984 Chicago Zone 01
312-985 Chicago Zone 01 4/10/2001
312-986 Chicago Zone 01
312-987 Chicago Zone 01
312-988 Chicago Zone 01
312-989 Chicago Zone 01 6/25/2015
312-990 Hinsdale
312-991 Wheeling
312-992 Chicago Zone 01
312-993 Chicago Zone 01
312-994 Chicago Zone 01 4/10/2001
312-995 Chicago Zone 01 8/12/2014
312-996 Chicago Zone 01
312-997 Chicago Zone 01
312-998 Chicago Zone 01 8/12/2014
312-999 Chicago Zone 01 8/20/2010
  1. The NPA is the Numbering Plan Area (area code) and NXX is the central office code.
  2. 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.
  3. The assignment date. If no date is shown the exchange code was assigned before 2001.

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List of cities in area code 312

City4 County Time5
Chicago (downtown area) Cook C
  1. Listed in the table above are most, often not all places served by area code 312. When two or more places with the same name are located in the same state we list the largest one only. Cities with population over 50,000 are displayed in bold text.
  2. C stands for Central Time (currently 04:41:43 AM).

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