Local Calling Guide
Area code/prefix search
NPA: 312
[Rate centres in NPA 312]
[Dial plan for NPA 312]
<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 >>
| NPA-NXX |
BLOCK |
Rate Centre |
Region |
Switch |
OCN |
LATA |
LIR |
Eff date |
Disc date |
| 312-472
| 3 |
Chicago Zone 01-Lakeshore |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
2005-12-18 |
|
| 312-472
| 4 |
Chicago Zone 01-Lakeshore |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
2005-12-18 |
|
| 312-472
| 5 |
Chicago Zone 01-Lakeshore |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
2005-12-18 |
|
| 312-472
| 6 |
Chicago Zone 01-Lakeshore |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
2005-12-18 |
|
| 312-472
| 7 |
Chicago Zone 01-Lakeshore |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
2005-12-18 |
|
| 312-472
| 8 |
Chicago Zone 01-Lakeshore |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
2005-12-18 |
|
| 312-472
| 9 |
Chicago Zone 01-Lakeshore |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
2005-12-18 |
|
| 312-473
| A |
Chicago Zone 01-Calumet |
IL |
CHCGIL24DS6 |
224C ONVOY, LLC |
358 |
|
2024-12-29 |
|
| 312-473
| 0 |
Chicago Zone 01-Calumet |
IL |
|
224C ONVOY, LLC |
358 |
|
2007-01-06 |
|
| 312-473
| 1 |
Chicago Zone 01-Calumet |
IL |
|
224C ONVOY, LLC |
358 |
|
2007-01-06 |
|
| 312-473
| 2 |
Chicago Zone 01-Calumet |
IL |
|
6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
358 |
|
2025-09-25 |
|
| 312-473
| 3 |
Chicago Zone 01-Calumet |
IL |
|
224C ONVOY, LLC |
358 |
|
2007-01-06 |
|
| 312-473
| 4 |
Chicago Zone 01-Calumet |
IL |
|
6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
358 |
|
2025-09-25 |
|
| 312-473
| 5 |
Chicago Zone 01-Calumet |
IL |
|
6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
358 |
|
2025-09-25 |
|
| 312-473
| 6 |
Chicago Zone 01-Calumet |
IL |
|
6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
358 |
|
2025-09-25 |
|
| 312-473
| 7 |
Chicago Zone 01-Calumet |
IL |
|
224C ONVOY, LLC |
358 |
|
2025-09-27 |
|
| 312-473
| 8 |
Chicago Zone 01-Calumet |
IL |
|
224C ONVOY, LLC |
358 |
|
2025-04-06 |
|
| 312-473
| 9 |
Chicago Zone 01-Calumet |
IL |
|
321J HD CARRIER LLC |
358 |
|
2025-10-11 |
|
| 312-474
| A |
Chicago Zone 01-Canal |
IL |
CHCGILCLDS0 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-475
| A |
Chicago Zone 01-Superior |
IL |
CHCGILSUDS2 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-476
| A |
Chicago Zone 01-Calumet |
IL |
ELGNILOTGT5 |
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-476
| 0 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2004-03-01 |
|
| 312-476
| 1 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
2000-08-29 |
|
| 312-476
| 2 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
2000-08-29 |
|
| 312-476
| 3 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
2002-05-01 |
|
| 312-476
| 4 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
2002-05-01 |
|
| 312-476
| 5 |
Chicago Zone 01-Calumet |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
2002-06-04 |
|
| 312-476
| 6 |
Chicago Zone 01-Calumet |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
2002-06-04 |
|
| 312-476
| 7 |
Chicago Zone 01-Calumet |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
2002-06-04 |
|
| 312-476
| 8 |
Chicago Zone 01-Calumet |
IL |
|
460K FIRST COMMUNICATIONS, LLC |
358 |
|
2009-09-16 |
|
| 312-476
| 9 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2010-03-04 |
|
| 312-477
| A |
Chicago Zone 01-Calumet |
IL |
CHCGILGMDS7 |
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-477
| 0 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
2011-04-13 |
|
| 312-477
| 1 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2013-06-22 |
|
| 312-477
| 2 |
Chicago Zone 01-Calumet |
IL |
|
224C ONVOY, LLC |
358 |
|
2011-02-10 |
|
| 312-477
| 3 |
Chicago Zone 01-Calumet |
IL |
|
224C ONVOY, LLC |
358 |
|
2011-02-10 |
|
| 312-477
| 4 |
Chicago Zone 01-Calumet |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
2011-02-14 |
|
| 312-477
| 5 |
Chicago Zone 01-Calumet |
IL |
|
829J PAETEC ITEL, LLC |
358 |
|
2011-02-10 |
|
| 312-477
| 6 |
Chicago Zone 01-Calumet |
IL |
|
6534 NEW CINGULAR WIRELESS PCS, LLC - IL |
358 |
|
2011-02-18 |
|
| 312-477
| 7 |
Chicago Zone 01-Calumet |
IL |
|
5447 ACCESS ONE, INC. - IL |
358 |
|
2011-03-04 |
|
| 312-477
| 8 |
Chicago Zone 01-Calumet |
IL |
|
5447 ACCESS ONE, INC. - IL |
358 |
|
2011-03-04 |
|
| 312-477
| 9 |
Chicago Zone 01-Calumet |
IL |
|
6534 NEW CINGULAR WIRELESS PCS, LLC - IL |
358 |
|
2011-03-15 |
|
| 312-478
| A |
Chicago Zone 01-Calumet |
IL |
ELGNILOTGT5 |
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-478
| 0 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-05-18 |
|
| 312-478
| 1 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-05-18 |
|
| 312-478
| 2 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-05-18 |
|
| 312-478
| 3 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-05-18 |
|
| 312-478
| 4 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-05-18 |
|
| 312-478
| 5 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-05-18 |
|
| 312-478
| 6 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-05-18 |
|
<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 >>
Last updated: Thu, 29 Jan 2026 14:35:03 UTC
Sponsored by: Execulink Telecom
Like this site? We accept donations via PayPal.