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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 01 January 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.

03:13:13 PM 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
312-200Chicago Zone 0110/2/2017
312-201Chicago Zone 01
312-202Chicago Zone 01
312-203Chicago Zone 01
312-204Chicago Zone 01
312-205Chicago Zone 01
312-206Chicago Zone 01
312-207Chicago Zone 01
312-208Chicago Zone 01
312-209Northbrook
312-210Chicago Zone 017/19/2018
312-212Chicago Zone 01
312-213Chicago Zone 01
312-214Chicago Zone 01
312-215Wheeling
312-216Chicago Zone 012/13/2012
312-217Chicago Zone 01
312-218Chicago Zone 01
312-219Chicago Zone 014/10/2012
312-220Chicago Zone 01
312-221Chicago Zone 016/17/2011
312-222Chicago Zone 01
312-223Chicago Zone 01
312-224Chicago Zone 01
312-225Chicago Zone 01
312-226Chicago Zone 01
312-227Chicago Zone 019/15/2010
312-228Chicago Zone 01
312-229Chicago Zone 01
312-230Chicago Zone 01
312-231Roselle
312-232Chicago Zone 014/23/2001
312-233Chicago Zone 01
312-234Chicago Zone 01
312-235Chicago Zone 01
312-236Chicago Zone 01
312-237Chicago Zone 01
312-238Chicago Zone 01
312-239Chicago Zone 01
312-240Chicago Zone 01
312-241Chicago Zone 018/17/2011
312-242Chicago Zone 01
312-243Chicago Zone 01
312-244Chicago Zone 01
312-245Chicago Zone 01
312-246Wheeling
312-247Chicago Zone 014/6/2004
312-248Chicago Zone 017/1/2014
312-249Chicago Zone 01
312-250Chicago Zone 01
312-251Chicago Zone 01
312-252Chicago Zone 01
312-253Chicago Zone 01
312-254Chicago Zone 01
312-255Chicago Zone 01
312-256Chicago Zone 01
312-257Chicago Zone 018/18/2011
312-258Chicago Zone 01
312-259Chicago Zone 01
312-260Chicago Zone 01
312-261Chicago Zone 01
312-262Chicago Zone 01
312-263Chicago Zone 01
312-264Chicago Zone 01
312-265Chicago Zone 0111/29/2005
312-266Chicago Zone 01
312-267Chicago Zone 01
312-268Chicago Zone 01
312-269Chicago Zone 01
312-270Chicago Zone 011/16/2017
312-271Chicago Zone 01
312-272Chicago Zone 01
312-273Chicago Zone 019/13/2011
312-274Chicago Zone 01
312-275Chicago Zone 01
312-276Chicago Zone 01
312-277Chicago Zone 01
312-278Chicago Zone 01
312-279Chicago Zone 01
312-280Chicago Zone 01
312-281Chicago Zone 01
312-282Chicago Zone 01
312-283Chicago Zone 01
312-284Chicago Zone 01
312-285Chicago Zone 01
312-286Chicago Zone 01
312-287Chicago Zone 07
312-288Chicago Zone 01
312-289Chicago Zone 01
312-290Chicago Zone 01
312-291Chicago Zone 01
312-292Chicago Zone 019/2/2011
312-293Chicago Zone 01
312-294Chicago Zone 01
312-295La Grange
312-296Chicago Zone 01
312-297Chicago Zone 01
312-298Chicago Zone 01
312-299Chicago Zone 01
312-300Chicago Zone 01
312-301Hinsdale
312-302Chicago Zone 01
312-303Wheeling
312-304Hinsdale
312-305Northbrook
312-306Chicago Zone 01
312-307Chicago Zone 01
312-308Chicago Zone 01
312-309Chicago Zone 01
312-310Northbrook
312-312Chicago Zone 011/19/2018
312-313Chicago Zone 0111/10/2014
312-314Hinsdale
312-315Chicago Zone 01
312-316Chicago Zone 01
312-317Wheeling
312-318La Grange
312-319Chicago Zone 014/28/2017
312-320Chicago Zone 01
312-321Chicago Zone 01
312-322Chicago Zone 01
312-323Chicago Zone 014/13/2001
312-324Chicago Zone 015/3/2001
312-325Chicago Zone 016/24/2003
312-326Chicago Zone 01
312-327Chicago Zone 01
312-328Chicago Zone 01
312-329Chicago Zone 01
312-330Chicago Zone 01
312-331Wheeling
312-332Chicago Zone 01
312-333Chicago Zone 014/13/2001
312-334Chicago Zone 01
312-335Chicago Zone 01
312-336Chicago Zone 01
312-337Chicago Zone 01
312-338Chicago Zone 01
312-339Chicago Zone 01
312-340Chicago Zone 01
312-341Chicago Zone 01
312-342Chicago Zone 01
312-343Chicago Zone 01
312-344Chicago Zone 01
312-345Chicago Zone 01
312-346Chicago Zone 01
312-347Chicago Zone 01
312-348Chicago Zone 0111/14/2003
312-349Chicago Zone 01
312-350Chicago Zone 01
312-351Chicago Zone 01
312-352Hinsdale
312-353Chicago Zone 01
312-354Roselle
312-355Chicago Zone 01
312-356Chicago Zone 01
312-357Chicago Zone 01
312-358Chicago Zone 017/21/2015
312-359Chicago Zone 01
312-360Chicago Zone 01
312-361Chicago Zone 01
312-362Chicago Zone 01
312-363Chicago Zone 01
312-364Chicago Zone 01
312-365Chicago Zone 01
312-366Chicago Zone 012/3/2016
312-367La Grange
312-368Chicago Zone 01
312-369Chicago Zone 01
312-370Chicago Zone 01
312-371Chicago Zone 01
312-372Chicago Zone 01
312-373Chicago Zone 01
312-374Chicago Zone 01
312-375Chicago Zone 01
312-376Chicago Zone 016/11/2004
312-377Chicago Zone 01
312-378Chicago Zone 01
312-379Chicago Zone 014/10/2001
312-380Chicago Zone 01
312-381Chicago Zone 01
312-382Chicago Zone 01
312-383Chicago Zone 012/1/2016
312-384Chicago Zone 01
312-385Chicago Zone 01
312-386Chicago Zone 01
312-387Chicago Zone 01
312-388Chicago Zone 01
312-389Chicago Zone 01
312-390Chicago Zone 014/16/2001
312-391Chicago Zone 01
312-392Chicago Zone 0110/23/2017
312-393Chicago Zone 014/23/2001
312-394Chicago Zone 01
312-395Chicago Zone 01
312-396Chicago Zone 01
312-397Chicago Zone 01
312-398Chicago Zone 01
312-399Chicago Zone 01
312-400Chicago Zone 014/13/2001
312-401Chicago Zone 01
312-402Chicago Zone 01
312-403La Grange
312-404Chicago Zone 0110/14/2002
312-405Chicago Zone 01
312-406Wheeling
312-407Chicago Zone 01
312-408Chicago Zone 01
312-409Chicago Zone 01
312-410Chicago Zone 01
312-412Wheeling
312-413Chicago Zone 01
312-414Chicago Zone 018/12/2016
312-415Chicago Zone 01
312-416Chicago Zone 01
312-417Chicago Zone 01
312-418Chicago Zone 01
312-419Chicago Zone 01
312-420Chicago Zone 01
312-421Chicago Zone 01
312-422Chicago Zone 01
312-423Chicago Zone 01
312-424Chicago Zone 01
312-425Chicago Zone 01
312-426Chicago Zone 01
312-427Chicago Zone 01
312-428Chicago Zone 01
312-429Chicago Zone 01
312-430Chicago Zone 01
312-431Chicago Zone 01
312-432Chicago Zone 01
312-433Chicago Zone 01
312-434Chicago Zone 017/8/2011
312-435Chicago Zone 01
312-436Chicago Zone 01
312-437Chicago Zone 01
312-438Chicago Zone 016/2/2017
312-439Chicago Zone 0111/28/2016
312-440Chicago Zone 01
312-441Chicago Zone 01
312-442Chicago Zone 01
312-443Chicago Zone 01
312-444Chicago Zone 01
312-445Chicago Zone 01
312-446Chicago Zone 01
312-447Chicago Zone 01
312-448Chicago Zone 018/2/2011
312-449Chicago Zone 014/23/2001
312-450Chicago Zone 01
312-451Chicago Zone 01
312-452Chicago Zone 014/13/2001
312-453Chicago Zone 01
312-454Chicago Zone 01
312-455Chicago Zone 01
312-456Chicago Zone 01
312-457Chicago Zone 014/23/2001
312-458Chicago Zone 01
312-459Chicago Zone 018/2/2011
312-460Chicago Zone 01
312-461Chicago Zone 01
312-462Chicago Zone 01
312-463Chicago Zone 01
312-464Chicago Zone 01
312-465Chicago Zone 013/26/2009
312-466Chicago Zone 01
312-467Chicago Zone 01
312-468Chicago Zone 016/26/2015
312-469Chicago Zone 01
312-470Chicago Zone 01
312-471Chicago Zone 016/26/2015
312-472Chicago Zone 0110/27/2005
312-473Chicago Zone 0111/15/2006
312-474Chicago Zone 01
312-475Chicago Zone 01
312-476Chicago Zone 01
312-477Chicago Zone 0110/20/2010
312-478Chicago Zone 013/20/2014
312-479Chicago Zone 01
312-480Chicago Zone 01
312-481Chicago Zone 017/7/2017
312-482Chicago Zone 01
312-483Chicago Zone 018/22/2014
312-484Chicago Zone 01
312-485Chicago Zone 01
312-486Chicago Zone 014/23/2004
312-487Chicago Zone 0110/27/2014
312-488Chicago Zone 01
312-489Chicago Zone 01
312-490Chicago Zone 01
312-491Chicago Zone 01
312-492Chicago Zone 01
312-493Chicago Zone 01
312-494Chicago Zone 01
312-495Chicago Zone 01
312-496Chicago Zone 01
312-497Chicago Zone 01
312-498Chicago Zone 01
312-499Chicago Zone 01
312-500Chicago Zone 015/22/2018
312-501La Grange
312-502Chicago Zone 01
312-503Chicago Zone 01
312-504Chicago Zone 01
312-505Chicago Zone 01
312-506Chicago Zone 015/24/2004
312-507Chicago Zone 01
312-508Chicago Zone 013/19/2012
312-509Chicago Zone 013/6/2012
312-510Hinsdale
312-512Chicago Zone 01
312-513Chicago Zone 01
312-514Chicago Zone 014/13/2001
312-515Chicago Zone 01
312-516Chicago Zone 01
312-517Chicago Zone 012/9/2015
312-518Wheeling
312-519Chicago Zone 01
312-520Chicago Zone 01
312-521Chicago Zone 01
312-522Chicago Zone 018/22/2014
312-523Chicago Zone 01
312-524Wheeling
312-525Chicago Zone 013/20/2002
312-526Chicago Zone 01
312-527Chicago Zone 01
312-528Chicago Zone 01
312-529Chicago Zone 01
312-530Chicago Zone 017/28/2020
312-531Hinsdale
312-532Chicago Zone 01
312-533Chicago Zone 01
312-534Chicago Zone 019/17/2008
312-535Chicago Zone 017/20/2017
312-536Chicago Zone 016/26/2015
312-537Chicago Zone 01
312-538Chicago Zone 017/21/2017
312-539Chicago Zone 011/11/2016
312-540Chicago Zone 01
312-541Chicago Zone 01
312-542Chicago Zone 01
312-543Chicago Zone 01
312-544Chicago Zone 01
312-545Chicago Zone 01
312-546Chicago Zone 01
312-547Chicago Zone 01
312-548Chicago Zone 019/5/2007
312-549Chicago Zone 019/25/2015
312-550Chicago Zone 01
312-551Chicago Zone 01
312-552Chicago Zone 01
312-553Chicago Zone 01
312-554Chicago Zone 01
312-556Chicago Zone 01
312-557Chicago Zone 01
312-558Chicago Zone 01
312-559Chicago Zone 01
312-560Chicago Zone 01
312-561Chicago Zone 016/20/2012
312-562Chicago Zone 01
312-563Chicago Zone 01
312-564Chicago Zone 0111/13/2006
312-565Chicago Zone 01
312-566Chicago Zone 01
312-567Chicago Zone 01
312-568Chicago Zone 01
312-569Chicago Zone 01
312-570Chicago Zone 01
312-571Chicago Zone 01
312-572Chicago Zone 01
312-573Chicago Zone 01
312-574Chicago Zone 01
312-575Chicago Zone 01
312-576Chicago Zone 01
312-577Chicago Zone 01
312-578Chicago Zone 01
312-579Chicago Zone 017/25/2017
312-580Chicago Zone 01
312-581Chicago Zone 017/31/2017
312-582Chicago Zone 015/16/2002
312-583Chicago Zone 01
312-584Chicago Zone 018/14/2018
312-585Chicago Zone 014/16/2013
312-586Chicago Zone 015/4/2016
312-587Chicago Zone 01
312-588Chicago Zone 01
312-589Chicago Zone 01
312-590Chicago Zone 01
312-591Chicago Zone 01
312-592Chicago Zone 01
312-593Chicago Zone 01
312-594Chicago Zone 0111/6/2008
312-595Chicago Zone 01
312-596Chicago Zone 01
312-597Chicago Zone 0110/4/2016
312-598Chicago Zone 011/24/2019
312-599Chicago Zone 0111/21/2016
312-600Chicago Zone 015/1/2012
312-601Chicago Zone 01
312-602Chicago Zone 01
312-603Chicago Zone 01
312-604Chicago Zone 01
312-605Chicago Zone 018/6/2012
312-606Chicago Zone 01
312-607Chicago Zone 01
312-608Chicago Zone 01
312-609Chicago Zone 01
312-610Chicago Zone 018/6/2012
312-612Chicago Zone 01
312-613Chicago Zone 01
312-614Chicago Zone 0110/19/2012
312-615Wheeling
312-616Chicago Zone 01
312-617Chicago Zone 01
312-618Chicago Zone 01
312-619Chicago Zone 019/11/2012
312-620Chicago Zone 018/15/2012
312-621Chicago Zone 01
312-622Chicago Zone 012/14/2001
312-623Chicago Zone 01
312-624Chicago Zone 01
312-625Chicago Zone 0111/12/2001
312-626Chicago Zone 012/4/2008
312-627Chicago Zone 01
312-628Chicago Zone 01
312-629Chicago Zone 01
312-630Chicago Zone 01
312-631Chicago Zone 011/11/2013
312-632Chicago Zone 01
312-633Chicago Zone 01
312-634Chicago Zone 01
312-635Chicago Zone 01
312-636Chicago Zone 01
312-637Chicago Zone 01
312-638Chicago Zone 01
312-639Chicago Zone 0110/19/2017
312-640Chicago Zone 01
312-641Chicago Zone 01
312-642Chicago Zone 01
312-643Chicago Zone 01
312-644Chicago Zone 01
312-645Chicago Zone 01
312-646Chicago Zone 01
312-647Chicago Zone 015/24/2013
312-648Chicago Zone 01
312-649Chicago Zone 01
312-650Chicago Zone 01
312-651Chicago Zone 01
312-652Chicago Zone 01
312-653Chicago Zone 01
312-654Chicago Zone 01
312-655Chicago Zone 01
312-656Chicago Zone 01
312-657Chicago Zone 01
312-658Chicago Zone 01
312-659Chicago Zone 01
312-660Chicago Zone 01
312-661Chicago Zone 01
312-662Chicago Zone 01
312-663Chicago Zone 01
312-664Chicago Zone 01
312-665Chicago Zone 01
312-666Chicago Zone 01
312-667Chicago Zone 018/31/2012
312-668Chicago Zone 015/28/2019
312-669Chicago Zone 01
312-670Chicago Zone 01
312-671Chicago Zone 01
312-672Chicago Zone 01
312-673Chicago Zone 01
312-674Chicago Zone 01
312-675Chicago Zone 01
312-676Chicago Zone 016/16/2006
312-677Chicago Zone 01
312-678Chicago Zone 017/25/2013
312-679Chicago Zone 014/23/2001
312-680Chicago Zone 01
312-681Chicago Zone 01
312-682Chicago Zone 015/14/2020
312-683Chicago Zone 01
312-684Chicago Zone 019/13/2016
312-685Chicago Zone 01
312-686Chicago Zone 0112/13/2016
312-687Chicago Zone 019/13/2016
312-688Chicago Zone 01
312-689Chicago Zone 014/13/2001
312-690Chicago Zone 015/6/2014
312-691Chicago Zone 01
312-692Chicago Zone 01
312-693Chicago Zone 01
312-694Chicago Zone 01
312-695Chicago Zone 01
312-696Chicago Zone 01
312-697Chicago Zone 01
312-698Chicago Zone 018/23/2001
312-699Hinsdale
312-701Chicago Zone 01
312-702Chicago Zone 0112/31/2012
312-703Chicago Zone 01
312-704Chicago Zone 01
312-705Chicago Zone 01
312-706Chicago Zone 01
312-707Chicago Zone 01
312-709Chicago Zone 015/24/2013
312-710Chicago Zone 01
312-712Chicago Zone 01
312-713Chicago Zone 014/16/2001
312-714Chicago Zone 01
312-715Chicago Zone 01
312-716Chicago Zone 01
312-717La Grange
312-718Chicago Zone 01
312-719Chicago Zone 01
312-720Chicago Zone 01
312-721Chicago Zone 0110/22/2013
312-722Chicago Zone 016/1/2015
312-723Chicago Zone 0111/28/2016
312-724Chicago Zone 012/7/2013
312-725Chicago Zone 0110/8/2008
312-726Chicago Zone 01
312-727Chicago Zone 01
312-728Chicago Zone 0110/19/2017
312-729Chicago Zone 01
312-730Chicago Zone 01
312-731Chicago Zone 01
312-732Chicago Zone 01
312-733Chicago Zone 01
312-734Chicago Zone 019/17/2015
312-735Chicago Zone 047/6/2001
312-736Chicago Zone 0110/20/2017
312-737Chicago Zone 01
312-738Chicago Zone 01
312-739Chicago Zone 01
312-740Chicago Zone 014/13/2001
312-741Chicago Zone 0110/20/2017
312-742Chicago Zone 01
312-743Chicago Zone 0111/15/2001
312-744Chicago Zone 01
312-745Chicago Zone 01
312-746Chicago Zone 01
312-747Chicago Zone 01
312-748Chicago Zone 01
312-749Hinsdale
312-750Chicago Zone 01
312-751Chicago Zone 01
312-752Chicago Zone 014/19/2002
312-753Chicago Zone 01
312-754Chicago Zone 012/26/2013
312-755Chicago Zone 01
312-756Chicago Zone 01
312-757Chicago Zone 013/28/2013
312-758Chicago Zone 01
312-759Chicago Zone 01
312-760Chicago Zone 014/13/2001
312-761Chicago Zone 015/25/2018
312-762Chicago Zone 01
312-763Chicago Zone 015/12/2014
312-764Chicago Zone 0110/20/2016
312-765Chicago Zone 01
312-766Chicago Zone 0110/17/2016
312-767Chicago Zone 014/16/2015
312-768Chicago Zone 01
312-769Chicago Zone 01
312-770Chicago Zone 01
312-771Chicago Zone 01
312-772Chicago Zone 018/18/2008
312-774Chicago Zone 018/19/2013
312-775Chicago Zone 01
312-776Chicago Zone 011/30/2019
312-777Chicago Zone 01
312-778Chicago Zone 015/8/2015
312-779Chicago Zone 015/13/2019
312-780Chicago Zone 01
312-781Chicago Zone 01
312-782Chicago Zone 01
312-783Chicago Zone 018/8/2016
312-784Chicago Zone 017/12/2007
312-785Chicago Zone 018/19/2014
312-786Chicago Zone 01
312-787Chicago Zone 01
312-788Chicago Zone 01
312-789Chicago Zone 01
312-790Chicago Zone 01
312-791Chicago Zone 01
312-792Chicago Zone 0111/20/2014
312-793Chicago Zone 01
312-794Chicago Zone 01
312-795Chicago Zone 01
312-796Chicago Zone 017/26/2016
312-797Chicago Zone 01
312-798Chicago Zone 01
312-799Chicago Zone 01
312-800Chicago Zone 0111/20/2012
312-801Chicago Zone 014/29/2013
312-802Chicago Zone 01
312-803Chicago Zone 01
312-804Chicago Zone 011/23/2002
312-805Chicago Zone 01
312-806Chicago Zone 01
312-807Chicago Zone 01
312-808Chicago Zone 01
312-809Chicago Zone 0110/25/2013
312-810Chicago Zone 01
312-812Chicago Zone 01
312-813Chicago Zone 01
312-814Chicago Zone 01
312-815Chicago Zone 015/7/2018
312-816Hinsdale
312-817Chicago Zone 01
312-818Chicago Zone 018/19/2013
312-819Chicago Zone 01
312-820Chicago Zone 011/8/2020
312-821Chicago Zone 01
312-822Chicago Zone 01
312-823Chicago Zone 01
312-824Chicago Zone 016/20/2016
312-825Chicago Zone 013/17/2016
312-826Chicago Zone 016/17/2016
312-827Chicago Zone 01
312-828Chicago Zone 01
312-829Chicago Zone 01
312-830Chicago Zone 01
312-831Chicago Zone 01
312-832Chicago Zone 01
312-833Chicago Zone 01
312-834Chicago Zone 01
312-835Chicago Zone 01
312-836Chicago Zone 01
312-837Chicago Zone 019/3/2015
312-838Chicago Zone 011/11/2016
312-839Chicago Zone 014/13/2001
312-840Chicago Zone 01
312-841Chicago Zone 01
312-842Chicago Zone 01
312-843Chicago Zone 013/12/2014
312-844Hinsdale
312-845Chicago Zone 01
312-846Chicago Zone 01
312-847Chicago Zone 016/28/2019
312-848Chicago Zone 01
312-849Chicago Zone 01
312-850Chicago Zone 01
312-851Chicago Zone 01
312-852Chicago Zone 01
312-853Chicago Zone 01
312-854Chicago Zone 01
312-855Chicago Zone 01
312-856Chicago Zone 01
312-857Chicago Zone 01
312-858Chicago Zone 0112/21/2015
312-859Chicago Zone 01
312-860Chicago Zone 01
312-861Chicago Zone 01
312-862Chicago Zone 011/25/2006
312-863Chicago Zone 014/10/2001
312-864Chicago Zone 01
312-865Wheeling
312-866Chicago Zone 018/22/2014
312-867Chicago Zone 01
312-868Chicago Zone 0112/4/2015
312-869Chicago Zone 01
312-870Chicago Zone 01
312-871Chicago Zone 018/28/2015
312-872Chicago Zone 017/12/2018
312-873Chicago Zone 01
312-874Chicago Zone 015/22/2015
312-875Chicago Zone 01
312-876Chicago Zone 01
312-877Chicago Zone 018/12/2014
312-878Chicago Zone 012/4/2008
312-879Chicago Zone 01
312-880Chicago Zone 01
312-881Chicago Zone 014/10/2001
312-882Chicago Zone 01
312-883Chicago Zone 0111/12/2014
312-884Chicago Zone 014/10/2001
312-885Chicago Zone 019/22/2015
312-886Chicago Zone 01
312-887Chicago Zone 01
312-888Chicago Zone 011/13/2012
312-889Chicago Zone 016/25/2015
312-890Chicago Zone 01
312-891Chicago Zone 01
312-892Chicago Zone 01
312-893Chicago Zone 01
312-894Chicago Zone 01
312-895Chicago Zone 01
312-896Chicago Zone 01
312-897Chicago Zone 013/23/2015
312-898Chicago Zone 01
312-899Chicago Zone 01
312-900Chicago Zone 011/18/2019
312-901Chicago Zone 01
312-902Chicago Zone 01
312-903Chicago Zone 014/13/2001
312-904Chicago Zone 01
312-905Chicago Zone 01
312-906Chicago Zone 01
312-907Chicago Zone 01
312-908Chicago Zone 01
312-909Chicago Zone 01
312-910Chicago Zone 01
312-912Chicago Zone 01
312-913Chicago Zone 01
312-914Chicago Zone 01
312-915Chicago Zone 01
312-916Chicago Zone 014/23/2001
312-917Chicago Zone 01
312-918Chicago Zone 018/19/2013
312-919Chicago Zone 01
312-920Chicago Zone 01
312-921Chicago Zone 017/21/2008
312-922Chicago Zone 01
312-923Chicago Zone 01
312-924Chicago Zone 01
312-925Chicago Zone 01
312-926Chicago Zone 01
312-927Chicago Zone 018/21/2002
312-928Chicago Zone 01
312-929Chicago Zone 014/27/2006
312-930Chicago Zone 01
312-931Chicago Zone 01
312-932Chicago Zone 01
312-933Chicago Zone 01
312-934Chicago Zone 0112/8/2014
312-935Chicago Zone 01
312-936Chicago Zone 01
312-937Chicago Zone 019/25/2014
312-938Chicago Zone 01
312-939Chicago Zone 01
312-940Chicago Zone 019/20/2013
312-941Chicago Zone 01
312-942Chicago Zone 01
312-943Chicago Zone 01
312-944Chicago Zone 01
312-945Chicago Zone 01
312-946Chicago Zone 01
312-947Chicago Zone 0111/18/2010
312-948Chicago Zone 014/10/2001
312-949Chicago Zone 01
312-951Chicago Zone 01
312-952Chicago Zone 01
312-953Chicago Zone 01
312-954Chicago Zone 01
312-955Chicago Zone 01
312-956Chicago Zone 019/29/2014
312-957Chicago Zone 01
312-960Chicago Zone 01
312-961Chicago Zone 01
312-962Chicago Zone 01
312-963Chicago Zone 01
312-964Chicago Zone 01
312-965Chicago Zone 01
312-966Chicago Zone 0111/18/2014
312-967Chicago Zone 018/7/2014
312-968La Grange
312-969La Grange
312-970Chicago Zone 01
312-971Chicago Zone 015/1/2014
312-972Chicago Zone 01
312-973Chicago Zone 012/19/2014
312-974Chicago Zone 01
312-975Chicago Zone 019/15/2014
312-977Chicago Zone 01
312-978Chicago Zone 0110/22/2013
312-979Chicago Zone 01
312-980Chicago Zone 01
312-981Chicago Zone 014/10/2001
312-982Chicago Zone 0110/7/2014
312-983Chicago Zone 01
312-984Chicago Zone 01
312-985Chicago Zone 014/10/2001
312-986Chicago Zone 01
312-987Chicago Zone 01
312-988Chicago Zone 01
312-989Chicago Zone 016/25/2015
312-990Hinsdale
312-991Wheeling
312-992Chicago Zone 01
312-993Chicago Zone 01
312-994Chicago Zone 014/10/2001
312-995Chicago Zone 018/12/2014
312-996Chicago Zone 01
312-997Chicago Zone 01
312-998Chicago Zone 018/12/2014
312-999Chicago Zone 018/20/2010
  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 03:13:13 PM).

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