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312 Area Code

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

In service since January 01, 1947, area code 312 is the parent Numbering Plan Area in overlay complex 312/872 (overlaying NPAs cover the same area).

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

The current time for places served by area code 312 is 06:43:26 PM (Central Time Zone).

Reverse phone lookup

Map of area code 312

More Illinois area codes

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	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

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.
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

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.
C stands for Central Time Zone (currently 06:43:26 PM).

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312 Area Code

Reverse phone lookup

Map of area code 312

More Illinois area codes

312 phone number location

312-2XX-XXXX

312-3XX-XXXX

312-4XX-XXXX

312-5XX-XXXX

312-6XX-XXXX

312-9XX-XXXX

Cities in area code 312