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Area Code 312

Area code 312 is in Illinois, USA, spanning 1 county and serving the city of Chicago (downtown area); it currently uses 785 prefixes, assigned from 312-200-XXXX through 312-999-XXXX.

In service since January 01, 1947, area code 312 is the parent Numbering Plan Area in overlay complex 312/872.

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

The current local time is 12:49:11 PM (Central Time Zone).

312 area code location on a map

*For exact NPA boundaries see official 312 area code map

More Illinois area codes:

Reverse phone lookup

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Locate any 312-NXX prefix:

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 05/22/2023
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
312-773 Chicago Zone 01 05/19/2023
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 central office 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 USA area code 312. 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. C stands for Central Time Zone (currently 12:49:11 PM).
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