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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.

06:57:42 AM is the current time in area code 312 (Central Time Zone).

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312 phone number location

NPANXX Area served1 Date2
312-200 Chicago Zone 01 10/2/2017
312-201 Chicago Zone 01 N/A
312-202 Chicago Zone 01 N/A
312-203 Chicago Zone 01 N/A
312-204 Chicago Zone 01 N/A
312-205 Chicago Zone 01 N/A
312-206 Chicago Zone 01 N/A
312-207 Chicago Zone 01 N/A
312-208 Chicago Zone 01 N/A
312-209 Northbrook N/A
312-210 Chicago Zone 01 7/19/2018
312-212 Chicago Zone 01 N/A
312-213 Chicago Zone 01 N/A
312-214 Chicago Zone 01 N/A
312-215 Wheeling N/A
312-216 Chicago Zone 01 2/13/2012
312-217 Chicago Zone 01 N/A
312-218 Chicago Zone 01 N/A
312-219 Chicago Zone 01 4/10/2012
312-220 Chicago Zone 01 N/A
312-221 Chicago Zone 01 6/17/2011
312-222 Chicago Zone 01 N/A
312-223 Chicago Zone 01 N/A
312-224 Chicago Zone 01 N/A
312-225 Chicago Zone 01 N/A
312-226 Chicago Zone 01 N/A
312-227 Chicago Zone 01 9/15/2010
312-228 Chicago Zone 01 N/A
312-229 Chicago Zone 01 N/A
312-230 Chicago Zone 01 N/A
312-231 Roselle N/A
312-232 Chicago Zone 01 4/23/2001
312-233 Chicago Zone 01 N/A
312-234 Chicago Zone 01 N/A
312-235 Chicago Zone 01 N/A
312-236 Chicago Zone 01 N/A
312-237 Chicago Zone 01 N/A
312-238 Chicago Zone 01 N/A
312-239 Chicago Zone 01 N/A
312-240 Chicago Zone 01 N/A
312-241 Chicago Zone 01 8/17/2011
312-242 Chicago Zone 01 N/A
312-243 Chicago Zone 01 N/A
312-244 Chicago Zone 01 N/A
312-245 Chicago Zone 01 N/A
312-246 Wheeling N/A
312-247 Chicago Zone 01 4/6/2004
312-248 Chicago Zone 01 7/1/2014
312-249 Chicago Zone 01 N/A
312-250 Chicago Zone 01 N/A
312-251 Chicago Zone 01 N/A
312-252 Chicago Zone 01 N/A
312-253 Chicago Zone 01 N/A
312-254 Chicago Zone 01 N/A
312-255 Chicago Zone 01 N/A
312-256 Chicago Zone 01 N/A
312-257 Chicago Zone 01 8/18/2011
312-258 Chicago Zone 01 N/A
312-259 Chicago Zone 01 N/A
312-260 Chicago Zone 01 N/A
312-261 Chicago Zone 01 N/A
312-262 Chicago Zone 01 N/A
312-263 Chicago Zone 01 N/A
312-264 Chicago Zone 01 N/A
312-265 Chicago Zone 01 11/29/2005
312-266 Chicago Zone 01 N/A
312-267 Chicago Zone 01 N/A
312-268 Chicago Zone 01 N/A
312-269 Chicago Zone 01 N/A
312-270 Chicago Zone 01 1/16/2017
312-271 Chicago Zone 01 N/A
312-272 Chicago Zone 01 N/A
312-273 Chicago Zone 01 9/13/2011
312-274 Chicago Zone 01 N/A
312-275 Chicago Zone 01 N/A
312-276 Chicago Zone 01 N/A
312-277 Chicago Zone 01 N/A
312-278 Chicago Zone 01 N/A
312-279 Chicago Zone 01 N/A
312-280 Chicago Zone 01 N/A
312-281 Chicago Zone 01 N/A
312-282 Chicago Zone 01 N/A
312-283 Chicago Zone 01 N/A
312-284 Chicago Zone 01 N/A
312-285 Chicago Zone 01 N/A
312-286 Chicago Zone 01 N/A
312-287 Chicago Zone 07 N/A
312-288 Chicago Zone 01 N/A
312-289 Chicago Zone 01 N/A
312-290 Chicago Zone 01 N/A
312-291 Chicago Zone 01 N/A
312-292 Chicago Zone 01 9/2/2011
312-293 Chicago Zone 01 N/A
312-294 Chicago Zone 01 N/A
312-295 La Grange N/A
312-296 Chicago Zone 01 N/A
312-297 Chicago Zone 01 N/A
312-298 Chicago Zone 01 N/A
312-299 Chicago Zone 01 N/A

NPANXX Area served1 Date2
312-300 Chicago Zone 01 N/A
312-301 Hinsdale N/A
312-302 Chicago Zone 01 N/A
312-303 Wheeling N/A
312-304 Hinsdale N/A
312-305 Northbrook N/A
312-306 Chicago Zone 01 N/A
312-307 Chicago Zone 01 N/A
312-308 Chicago Zone 01 N/A
312-309 Chicago Zone 01 N/A
312-310 Northbrook N/A
312-312 Chicago Zone 01 1/19/2018
312-313 Chicago Zone 01 11/10/2014
312-314 Hinsdale N/A
312-315 Chicago Zone 01 N/A
312-316 Chicago Zone 01 N/A
312-317 Wheeling N/A
312-318 La Grange N/A
312-319 Chicago Zone 01 4/28/2017
312-320 Chicago Zone 01 N/A
312-321 Chicago Zone 01 N/A
312-322 Chicago Zone 01 N/A
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 N/A
312-327 Chicago Zone 01 N/A
312-328 Chicago Zone 01 N/A
312-329 Chicago Zone 01 N/A
312-330 Chicago Zone 01 N/A
312-331 Wheeling N/A
312-332 Chicago Zone 01 N/A
312-333 Chicago Zone 01 4/13/2001
312-334 Chicago Zone 01 N/A
312-335 Chicago Zone 01 N/A
312-336 Chicago Zone 01 N/A
312-337 Chicago Zone 01 N/A
312-338 Chicago Zone 01 N/A
312-339 Chicago Zone 01 N/A
312-340 Chicago Zone 01 N/A
312-341 Chicago Zone 01 N/A
312-342 Chicago Zone 01 N/A
312-343 Chicago Zone 01 N/A
312-344 Chicago Zone 01 N/A
312-345 Chicago Zone 01 N/A
312-346 Chicago Zone 01 N/A
312-347 Chicago Zone 01 N/A
312-348 Chicago Zone 01 11/14/2003
312-349 Chicago Zone 01 N/A
312-350 Chicago Zone 01 N/A
312-351 Chicago Zone 01 N/A
312-352 Hinsdale N/A
312-353 Chicago Zone 01 N/A
312-354 Roselle N/A
312-355 Chicago Zone 01 N/A
312-356 Chicago Zone 01 N/A
312-357 Chicago Zone 01 N/A
312-358 Chicago Zone 01 7/21/2015
312-359 Chicago Zone 01 N/A
312-360 Chicago Zone 01 N/A
312-361 Chicago Zone 01 N/A
312-362 Chicago Zone 01 N/A
312-363 Chicago Zone 01 N/A
312-364 Chicago Zone 01 N/A
312-365 Chicago Zone 01 N/A
312-366 Chicago Zone 01 2/3/2016
312-367 La Grange N/A
312-368 Chicago Zone 01 N/A
312-369 Chicago Zone 01 N/A
312-370 Chicago Zone 01 N/A
312-371 Chicago Zone 01 N/A
312-372 Chicago Zone 01 N/A
312-373 Chicago Zone 01 N/A
312-374 Chicago Zone 01 N/A
312-375 Chicago Zone 01 N/A
312-376 Chicago Zone 01 6/11/2004
312-377 Chicago Zone 01 N/A
312-378 Chicago Zone 01 N/A
312-379 Chicago Zone 01 4/10/2001
312-380 Chicago Zone 01 N/A
312-381 Chicago Zone 01 N/A
312-382 Chicago Zone 01 N/A
312-383 Chicago Zone 01 2/1/2016
312-384 Chicago Zone 01 N/A
312-385 Chicago Zone 01 N/A
312-386 Chicago Zone 01 N/A
312-387 Chicago Zone 01 N/A
312-388 Chicago Zone 01 N/A
312-389 Chicago Zone 01 N/A
312-390 Chicago Zone 01 4/16/2001
312-391 Chicago Zone 01 N/A
312-392 Chicago Zone 01 10/23/2017
312-393 Chicago Zone 01 4/23/2001
312-394 Chicago Zone 01 N/A
312-395 Chicago Zone 01 N/A
312-396 Chicago Zone 01 N/A
312-397 Chicago Zone 01 N/A
312-398 Chicago Zone 01 N/A
312-399 Chicago Zone 01 N/A

NPANXX Area served1 Date2
312-400 Chicago Zone 01 4/13/2001
312-401 Chicago Zone 01 N/A
312-402 Chicago Zone 01 N/A
312-403 La Grange N/A
312-404 Chicago Zone 01 10/14/2002
312-405 Chicago Zone 01 N/A
312-406 Wheeling N/A
312-407 Chicago Zone 01 N/A
312-408 Chicago Zone 01 N/A
312-409 Chicago Zone 01 N/A
312-410 Chicago Zone 01 N/A
312-412 Wheeling N/A
312-413 Chicago Zone 01 N/A
312-414 Chicago Zone 01 8/12/2016
312-415 Chicago Zone 01 N/A
312-416 Chicago Zone 01 N/A
312-417 Chicago Zone 01 N/A
312-418 Chicago Zone 01 N/A
312-419 Chicago Zone 01 N/A
312-420 Chicago Zone 01 N/A
312-421 Chicago Zone 01 N/A
312-422 Chicago Zone 01 N/A
312-423 Chicago Zone 01 N/A
312-424 Chicago Zone 01 N/A
312-425 Chicago Zone 01 N/A
312-426 Chicago Zone 01 N/A
312-427 Chicago Zone 01 N/A
312-428 Chicago Zone 01 N/A
312-429 Chicago Zone 01 N/A
312-430 Chicago Zone 01 N/A
312-431 Chicago Zone 01 N/A
312-432 Chicago Zone 01 N/A
312-433 Chicago Zone 01 N/A
312-434 Chicago Zone 01 7/8/2011
312-435 Chicago Zone 01 N/A
312-436 Chicago Zone 01 N/A
312-437 Chicago Zone 01 N/A
312-438 Chicago Zone 01 6/2/2017
312-439 Chicago Zone 01 11/28/2016
312-440 Chicago Zone 01 N/A
312-441 Chicago Zone 01 N/A
312-442 Chicago Zone 01 N/A
312-443 Chicago Zone 01 N/A
312-444 Chicago Zone 01 N/A
312-445 Chicago Zone 01 N/A
312-446 Chicago Zone 01 N/A
312-447 Chicago Zone 01 N/A
312-448 Chicago Zone 01 8/2/2011
312-449 Chicago Zone 01 4/23/2001
312-450 Chicago Zone 01 N/A
312-451 Chicago Zone 01 N/A
312-452 Chicago Zone 01 4/13/2001
312-453 Chicago Zone 01 N/A
312-454 Chicago Zone 01 N/A
312-455 Chicago Zone 01 N/A
312-456 Chicago Zone 01 N/A
312-457 Chicago Zone 01 4/23/2001
312-458 Chicago Zone 01 N/A
312-459 Chicago Zone 01 8/2/2011
312-460 Chicago Zone 01 N/A
312-461 Chicago Zone 01 N/A
312-462 Chicago Zone 01 N/A
312-463 Chicago Zone 01 N/A
312-464 Chicago Zone 01 N/A
312-465 Chicago Zone 01 3/26/2009
312-466 Chicago Zone 01 N/A
312-467 Chicago Zone 01 N/A
312-468 Chicago Zone 01 6/26/2015
312-469 Chicago Zone 01 N/A
312-470 Chicago Zone 01 N/A
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 N/A
312-475 Chicago Zone 01 N/A
312-476 Chicago Zone 01 N/A
312-477 Chicago Zone 01 10/20/2010
312-478 Chicago Zone 01 3/20/2014
312-479 Chicago Zone 01 N/A
312-480 Chicago Zone 01 N/A
312-481 Chicago Zone 01 7/7/2017
312-482 Chicago Zone 01 N/A
312-483 Chicago Zone 01 8/22/2014
312-484 Chicago Zone 01 N/A
312-485 Chicago Zone 01 N/A
312-486 Chicago Zone 01 4/23/2004
312-487 Chicago Zone 01 10/27/2014
312-488 Chicago Zone 01 N/A
312-489 Chicago Zone 01 N/A
312-490 Chicago Zone 01 N/A
312-491 Chicago Zone 01 N/A
312-492 Chicago Zone 01 N/A
312-493 Chicago Zone 01 N/A
312-494 Chicago Zone 01 N/A
312-495 Chicago Zone 01 N/A
312-496 Chicago Zone 01 N/A
312-497 Chicago Zone 01 N/A
312-498 Chicago Zone 01 N/A
312-499 Chicago Zone 01 N/A

NPANXX Area served1 Date2
312-500 Chicago Zone 01 5/22/2018
312-501 La Grange N/A
312-502 Chicago Zone 01 N/A
312-503 Chicago Zone 01 N/A
312-504 Chicago Zone 01 N/A
312-505 Chicago Zone 01 N/A
312-506 Chicago Zone 01 5/24/2004
312-507 Chicago Zone 01 N/A
312-508 Chicago Zone 01 3/19/2012
312-509 Chicago Zone 01 3/6/2012
312-510 Hinsdale N/A
312-512 Chicago Zone 01 N/A
312-513 Chicago Zone 01 N/A
312-514 Chicago Zone 01 4/13/2001
312-515 Chicago Zone 01 N/A
312-516 Chicago Zone 01 N/A
312-517 Chicago Zone 01 2/9/2015
312-518 Wheeling N/A
312-519 Chicago Zone 01 N/A
312-520 Chicago Zone 01 N/A
312-521 Chicago Zone 01 N/A
312-522 Chicago Zone 01 8/22/2014
312-523 Chicago Zone 01 N/A
312-524 Wheeling N/A
312-525 Chicago Zone 01 3/20/2002
312-526 Chicago Zone 01 N/A
312-527 Chicago Zone 01 N/A
312-528 Chicago Zone 01 N/A
312-529 Chicago Zone 01 N/A
312-530 Chicago Zone 01 7/28/2020
312-531 Hinsdale N/A
312-532 Chicago Zone 01 N/A
312-533 Chicago Zone 01 N/A
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 N/A
312-538 Chicago Zone 01 7/21/2017
312-539 Chicago Zone 01 1/11/2016
312-540 Chicago Zone 01 N/A
312-541 Chicago Zone 01 N/A
312-542 Chicago Zone 01 N/A
312-543 Chicago Zone 01 N/A
312-544 Chicago Zone 01 N/A
312-545 Chicago Zone 01 N/A
312-546 Chicago Zone 01 N/A
312-547 Chicago Zone 01 N/A
312-548 Chicago Zone 01 9/5/2007
312-549 Chicago Zone 01 9/25/2015
312-550 Chicago Zone 01 N/A
312-551 Chicago Zone 01 N/A
312-552 Chicago Zone 01 N/A
312-553 Chicago Zone 01 N/A
312-554 Chicago Zone 01 N/A
312-556 Chicago Zone 01 N/A
312-557 Chicago Zone 01 N/A
312-558 Chicago Zone 01 N/A
312-559 Chicago Zone 01 N/A
312-560 Chicago Zone 01 N/A
312-561 Chicago Zone 01 6/20/2012
312-562 Chicago Zone 01 N/A
312-563 Chicago Zone 01 N/A
312-564 Chicago Zone 01 11/13/2006
312-565 Chicago Zone 01 N/A
312-566 Chicago Zone 01 N/A
312-567 Chicago Zone 01 N/A
312-568 Chicago Zone 01 N/A
312-569 Chicago Zone 01 N/A
312-570 Chicago Zone 01 N/A
312-571 Chicago Zone 01 N/A
312-572 Chicago Zone 01 N/A
312-573 Chicago Zone 01 N/A
312-574 Chicago Zone 01 N/A
312-575 Chicago Zone 01 N/A
312-576 Chicago Zone 01 N/A
312-577 Chicago Zone 01 N/A
312-578 Chicago Zone 01 N/A
312-579 Chicago Zone 01 7/25/2017
312-580 Chicago Zone 01 N/A
312-581 Chicago Zone 01 7/31/2017
312-582 Chicago Zone 01 5/16/2002
312-583 Chicago Zone 01 N/A
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 N/A
312-588 Chicago Zone 01 N/A
312-589 Chicago Zone 01 N/A
312-590 Chicago Zone 01 N/A
312-591 Chicago Zone 01 N/A
312-592 Chicago Zone 01 N/A
312-593 Chicago Zone 01 N/A
312-594 Chicago Zone 01 11/6/2008
312-595 Chicago Zone 01 N/A
312-596 Chicago Zone 01 N/A
312-597 Chicago Zone 01 10/4/2016
312-598 Chicago Zone 01 1/24/2019
312-599 Chicago Zone 01 11/21/2016

NPANXX Area served1 Date2
312-600 Chicago Zone 01 5/1/2012
312-601 Chicago Zone 01 N/A
312-602 Chicago Zone 01 N/A
312-603 Chicago Zone 01 N/A
312-604 Chicago Zone 01 N/A
312-605 Chicago Zone 01 8/6/2012
312-606 Chicago Zone 01 N/A
312-607 Chicago Zone 01 N/A
312-608 Chicago Zone 01 N/A
312-609 Chicago Zone 01 N/A
312-610 Chicago Zone 01 8/6/2012
312-612 Chicago Zone 01 N/A
312-613 Chicago Zone 01 N/A
312-614 Chicago Zone 01 10/19/2012
312-615 Wheeling N/A
312-616 Chicago Zone 01 N/A
312-617 Chicago Zone 01 N/A
312-618 Chicago Zone 01 N/A
312-619 Chicago Zone 01 9/11/2012
312-620 Chicago Zone 01 8/15/2012
312-621 Chicago Zone 01 N/A
312-622 Chicago Zone 01 2/14/2001
312-623 Chicago Zone 01 N/A
312-624 Chicago Zone 01 N/A
312-625 Chicago Zone 01 11/12/2001
312-626 Chicago Zone 01 2/4/2008
312-627 Chicago Zone 01 N/A
312-628 Chicago Zone 01 N/A
312-629 Chicago Zone 01 N/A
312-630 Chicago Zone 01 N/A
312-631 Chicago Zone 01 1/11/2013
312-632 Chicago Zone 01 N/A
312-633 Chicago Zone 01 N/A
312-634 Chicago Zone 01 N/A
312-635 Chicago Zone 01 N/A
312-636 Chicago Zone 01 N/A
312-637 Chicago Zone 01 N/A
312-638 Chicago Zone 01 N/A
312-639 Chicago Zone 01 10/19/2017
312-640 Chicago Zone 01 N/A
312-641 Chicago Zone 01 N/A
312-642 Chicago Zone 01 N/A
312-643 Chicago Zone 01 N/A
312-644 Chicago Zone 01 N/A
312-645 Chicago Zone 01 N/A
312-646 Chicago Zone 01 N/A
312-647 Chicago Zone 01 5/24/2013
312-648 Chicago Zone 01 N/A
312-649 Chicago Zone 01 N/A
312-650 Chicago Zone 01 N/A
312-651 Chicago Zone 01 N/A
312-652 Chicago Zone 01 N/A
312-653 Chicago Zone 01 N/A
312-654 Chicago Zone 01 N/A
312-655 Chicago Zone 01 N/A
312-656 Chicago Zone 01 N/A
312-657 Chicago Zone 01 N/A
312-658 Chicago Zone 01 N/A
312-659 Chicago Zone 01 N/A
312-660 Chicago Zone 01 N/A
312-661 Chicago Zone 01 N/A
312-662 Chicago Zone 01 N/A
312-663 Chicago Zone 01 N/A
312-664 Chicago Zone 01 N/A
312-665 Chicago Zone 01 N/A
312-666 Chicago Zone 01 N/A
312-667 Chicago Zone 01 8/31/2012
312-668 Chicago Zone 01 5/28/2019
312-669 Chicago Zone 01 N/A
312-670 Chicago Zone 01 N/A
312-671 Chicago Zone 01 N/A
312-672 Chicago Zone 01 N/A
312-673 Chicago Zone 01 N/A
312-674 Chicago Zone 01 N/A
312-675 Chicago Zone 01 N/A
312-676 Chicago Zone 01 6/16/2006
312-677 Chicago Zone 01 N/A
312-678 Chicago Zone 01 7/25/2013
312-679 Chicago Zone 01 4/23/2001
312-680 Chicago Zone 01 N/A
312-681 Chicago Zone 01 N/A
312-682 Chicago Zone 01 5/14/2020
312-683 Chicago Zone 01 N/A
312-684 Chicago Zone 01 9/13/2016
312-685 Chicago Zone 01 N/A
312-686 Chicago Zone 01 12/13/2016
312-687 Chicago Zone 01 9/13/2016
312-688 Chicago Zone 01 N/A
312-689 Chicago Zone 01 4/13/2001
312-690 Chicago Zone 01 5/6/2014
312-691 Chicago Zone 01 N/A
312-692 Chicago Zone 01 N/A
312-693 Chicago Zone 01 N/A
312-694 Chicago Zone 01 N/A
312-695 Chicago Zone 01 N/A
312-696 Chicago Zone 01 N/A
312-697 Chicago Zone 01 N/A
312-698 Chicago Zone 01 8/23/2001
312-699 Hinsdale N/A
NPANXX Area served1 Date2
312-701 Chicago Zone 01 N/A
312-702 Chicago Zone 01 12/31/2012
312-703 Chicago Zone 01 N/A
312-704 Chicago Zone 01 N/A
312-705 Chicago Zone 01 N/A
312-706 Chicago Zone 01 N/A
312-707 Chicago Zone 01 N/A
312-709 Chicago Zone 01 5/24/2013
312-710 Chicago Zone 01 N/A
312-712 Chicago Zone 01 N/A
312-713 Chicago Zone 01 4/16/2001
312-714 Chicago Zone 01 N/A
312-715 Chicago Zone 01 N/A
312-716 Chicago Zone 01 N/A
312-717 La Grange N/A
312-718 Chicago Zone 01 N/A
312-719 Chicago Zone 01 N/A
312-720 Chicago Zone 01 N/A
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 N/A
312-727 Chicago Zone 01 N/A
312-728 Chicago Zone 01 10/19/2017
312-729 Chicago Zone 01 N/A
312-730 Chicago Zone 01 N/A
312-731 Chicago Zone 01 N/A
312-732 Chicago Zone 01 N/A
312-733 Chicago Zone 01 N/A
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 N/A
312-738 Chicago Zone 01 N/A
312-739 Chicago Zone 01 N/A
312-740 Chicago Zone 01 4/13/2001
312-741 Chicago Zone 01 10/20/2017
312-742 Chicago Zone 01 N/A
312-743 Chicago Zone 01 11/15/2001
312-744 Chicago Zone 01 N/A
312-745 Chicago Zone 01 N/A
312-746 Chicago Zone 01 N/A
312-747 Chicago Zone 01 N/A
312-748 Chicago Zone 01 N/A
312-749 Hinsdale N/A
312-750 Chicago Zone 01 N/A
312-751 Chicago Zone 01 N/A
312-752 Chicago Zone 01 4/19/2002
312-753 Chicago Zone 01 N/A
312-754 Chicago Zone 01 2/26/2013
312-755 Chicago Zone 01 N/A
312-756 Chicago Zone 01 N/A
312-757 Chicago Zone 01 3/28/2013
312-758 Chicago Zone 01 N/A
312-759 Chicago Zone 01 N/A
312-760 Chicago Zone 01 4/13/2001
312-761 Chicago Zone 01 5/25/2018
312-762 Chicago Zone 01 N/A
312-763 Chicago Zone 01 5/12/2014
312-764 Chicago Zone 01 10/20/2016
312-765 Chicago Zone 01 N/A
312-766 Chicago Zone 01 10/17/2016
312-767 Chicago Zone 01 4/16/2015
312-768 Chicago Zone 01 N/A
312-769 Chicago Zone 01 N/A
312-770 Chicago Zone 01 N/A
312-771 Chicago Zone 01 N/A
312-772 Chicago Zone 01 8/18/2008
312-774 Chicago Zone 01 8/19/2013
312-775 Chicago Zone 01 N/A
312-776 Chicago Zone 01 1/30/2019
312-777 Chicago Zone 01 N/A
312-778 Chicago Zone 01 5/8/2015
312-779 Chicago Zone 01 5/13/2019
312-780 Chicago Zone 01 N/A
312-781 Chicago Zone 01 N/A
312-782 Chicago Zone 01 N/A
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 N/A
312-787 Chicago Zone 01 N/A
312-788 Chicago Zone 01 N/A
312-789 Chicago Zone 01 N/A
312-790 Chicago Zone 01 N/A
312-791 Chicago Zone 01 N/A
312-792 Chicago Zone 01 11/20/2014
312-793 Chicago Zone 01 N/A
312-794 Chicago Zone 01 N/A
312-795 Chicago Zone 01 N/A
312-796 Chicago Zone 01 7/26/2016
312-797 Chicago Zone 01 N/A
312-798 Chicago Zone 01 N/A
312-799 Chicago Zone 01 N/A
NPANXX Area served1 Date2
312-800 Chicago Zone 01 11/20/2012
312-801 Chicago Zone 01 4/29/2013
312-802 Chicago Zone 01 N/A
312-803 Chicago Zone 01 N/A
312-804 Chicago Zone 01 1/23/2002
312-805 Chicago Zone 01 N/A
312-806 Chicago Zone 01 N/A
312-807 Chicago Zone 01 N/A
312-808 Chicago Zone 01 N/A
312-809 Chicago Zone 01 10/25/2013
312-810 Chicago Zone 01 N/A
312-812 Chicago Zone 01 N/A
312-813 Chicago Zone 01 N/A
312-814 Chicago Zone 01 N/A
312-815 Chicago Zone 01 5/7/2018
312-816 Hinsdale N/A
312-817 Chicago Zone 01 N/A
312-818 Chicago Zone 01 8/19/2013
312-819 Chicago Zone 01 N/A
312-820 Chicago Zone 01 1/8/2020
312-821 Chicago Zone 01 N/A
312-822 Chicago Zone 01 N/A
312-823 Chicago Zone 01 N/A
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 N/A
312-828 Chicago Zone 01 N/A
312-829 Chicago Zone 01 N/A
312-830 Chicago Zone 01 N/A
312-831 Chicago Zone 01 N/A
312-832 Chicago Zone 01 N/A
312-833 Chicago Zone 01 N/A
312-834 Chicago Zone 01 N/A
312-835 Chicago Zone 01 N/A
312-836 Chicago Zone 01 N/A
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 N/A
312-841 Chicago Zone 01 N/A
312-842 Chicago Zone 01 N/A
312-843 Chicago Zone 01 3/12/2014
312-844 Hinsdale N/A
312-845 Chicago Zone 01 N/A
312-846 Chicago Zone 01 N/A
312-847 Chicago Zone 01 6/28/2019
312-848 Chicago Zone 01 N/A
312-849 Chicago Zone 01 N/A
312-850 Chicago Zone 01 N/A
312-851 Chicago Zone 01 N/A
312-852 Chicago Zone 01 N/A
312-853 Chicago Zone 01 N/A
312-854 Chicago Zone 01 N/A
312-855 Chicago Zone 01 N/A
312-856 Chicago Zone 01 N/A
312-857 Chicago Zone 01 N/A
312-858 Chicago Zone 01 12/21/2015
312-859 Chicago Zone 01 N/A
312-860 Chicago Zone 01 N/A
312-861 Chicago Zone 01 N/A
312-862 Chicago Zone 01 1/25/2006
312-863 Chicago Zone 01 4/10/2001
312-864 Chicago Zone 01 N/A
312-865 Wheeling N/A
312-866 Chicago Zone 01 8/22/2014
312-867 Chicago Zone 01 N/A
312-868 Chicago Zone 01 12/4/2015
312-869 Chicago Zone 01 N/A
312-870 Chicago Zone 01 N/A
312-871 Chicago Zone 01 8/28/2015
312-872 Chicago Zone 01 7/12/2018
312-873 Chicago Zone 01 N/A
312-874 Chicago Zone 01 5/22/2015
312-875 Chicago Zone 01 N/A
312-876 Chicago Zone 01 N/A
312-877 Chicago Zone 01 8/12/2014
312-878 Chicago Zone 01 2/4/2008
312-879 Chicago Zone 01 N/A
312-880 Chicago Zone 01 N/A
312-881 Chicago Zone 01 4/10/2001
312-882 Chicago Zone 01 N/A
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 N/A
312-887 Chicago Zone 01 N/A
312-888 Chicago Zone 01 1/13/2012
312-889 Chicago Zone 01 6/25/2015
312-890 Chicago Zone 01 N/A
312-891 Chicago Zone 01 N/A
312-892 Chicago Zone 01 N/A
312-893 Chicago Zone 01 N/A
312-894 Chicago Zone 01 N/A
312-895 Chicago Zone 01 N/A
312-896 Chicago Zone 01 N/A
312-897 Chicago Zone 01 3/23/2015
312-898 Chicago Zone 01 N/A
312-899 Chicago Zone 01 N/A

NPANXX Area served1 Date2
312-900 Chicago Zone 01 1/18/2019
312-901 Chicago Zone 01 N/A
312-902 Chicago Zone 01 N/A
312-903 Chicago Zone 01 4/13/2001
312-904 Chicago Zone 01 N/A
312-905 Chicago Zone 01 N/A
312-906 Chicago Zone 01 N/A
312-907 Chicago Zone 01 N/A
312-908 Chicago Zone 01 N/A
312-909 Chicago Zone 01 N/A
312-910 Chicago Zone 01 N/A
312-912 Chicago Zone 01 N/A
312-913 Chicago Zone 01 N/A
312-914 Chicago Zone 01 N/A
312-915 Chicago Zone 01 N/A
312-916 Chicago Zone 01 4/23/2001
312-917 Chicago Zone 01 N/A
312-918 Chicago Zone 01 8/19/2013
312-919 Chicago Zone 01 N/A
312-920 Chicago Zone 01 N/A
312-921 Chicago Zone 01 7/21/2008
312-922 Chicago Zone 01 N/A
312-923 Chicago Zone 01 N/A
312-924 Chicago Zone 01 N/A
312-925 Chicago Zone 01 N/A
312-926 Chicago Zone 01 N/A
312-927 Chicago Zone 01 8/21/2002
312-928 Chicago Zone 01 N/A
312-929 Chicago Zone 01 4/27/2006
312-930 Chicago Zone 01 N/A
312-931 Chicago Zone 01 N/A
312-932 Chicago Zone 01 N/A
312-933 Chicago Zone 01 N/A
312-934 Chicago Zone 01 12/8/2014
312-935 Chicago Zone 01 N/A
312-936 Chicago Zone 01 N/A
312-937 Chicago Zone 01 9/25/2014
312-938 Chicago Zone 01 N/A
312-939 Chicago Zone 01 N/A
312-940 Chicago Zone 01 9/20/2013
312-941 Chicago Zone 01 N/A
312-942 Chicago Zone 01 N/A
312-943 Chicago Zone 01 N/A
312-944 Chicago Zone 01 N/A
312-945 Chicago Zone 01 N/A
312-946 Chicago Zone 01 N/A
312-947 Chicago Zone 01 11/18/2010
312-948 Chicago Zone 01 4/10/2001
312-949 Chicago Zone 01 N/A
312-951 Chicago Zone 01 N/A
312-952 Chicago Zone 01 N/A
312-953 Chicago Zone 01 N/A
312-954 Chicago Zone 01 N/A
312-955 Chicago Zone 01 N/A
312-956 Chicago Zone 01 9/29/2014
312-957 Chicago Zone 01 N/A
312-960 Chicago Zone 01 N/A
312-961 Chicago Zone 01 N/A
312-962 Chicago Zone 01 N/A
312-963 Chicago Zone 01 N/A
312-964 Chicago Zone 01 N/A
312-965 Chicago Zone 01 N/A
312-966 Chicago Zone 01 11/18/2014
312-967 Chicago Zone 01 8/7/2014
312-968 La Grange N/A
312-969 La Grange N/A
312-970 Chicago Zone 01 N/A
312-971 Chicago Zone 01 5/1/2014
312-972 Chicago Zone 01 N/A
312-973 Chicago Zone 01 2/19/2014
312-974 Chicago Zone 01 N/A
312-975 Chicago Zone 01 9/15/2014
312-977 Chicago Zone 01 N/A
312-978 Chicago Zone 01 10/22/2013
312-979 Chicago Zone 01 N/A
312-980 Chicago Zone 01 N/A
312-981 Chicago Zone 01 4/10/2001
312-982 Chicago Zone 01 10/7/2014
312-983 Chicago Zone 01 N/A
312-984 Chicago Zone 01 N/A
312-985 Chicago Zone 01 4/10/2001
312-986 Chicago Zone 01 N/A
312-987 Chicago Zone 01 N/A
312-988 Chicago Zone 01 N/A
312-989 Chicago Zone 01 6/25/2015
312-990 Hinsdale N/A
312-991 Wheeling N/A
312-992 Chicago Zone 01 N/A
312-993 Chicago Zone 01 N/A
312-994 Chicago Zone 01 4/10/2001
312-995 Chicago Zone 01 8/12/2014
312-996 Chicago Zone 01 N/A
312-997 Chicago Zone 01 N/A
312-998 Chicago Zone 01 8/12/2014
312-999 Chicago Zone 01 8/20/2010
  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 CO codes assigned before 2001.
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Cities in area code 312

City1 County Time2
Chicago (downtown area) Cook C
  1. Listed above are most places served by area code 312. When multiple places in a state/province share the same name we list the largest one only. Cities with population over 50,000 are displayed in bold text.
  2. C stands for Central Time Zone (currently 06:57:43 AM).
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