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 |
| 312-872
| 8 |
Chicago Zone 01-Calumet |
IL |
|
224C ONVOY, LLC |
358 |
|
2019-06-28 |
|
| 312-872
| 9 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2018-12-20 |
|
| 312-873
| A |
Chicago Zone 01-Canal |
IL |
EGVGILIFDS1 |
7196 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IL |
358 |
|
|
|
| 312-874
| A |
Chicago Zone 01-Calumet |
IL |
ELGNILOTGT5 |
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-874
| 0 |
Chicago Zone 01-Calumet |
IL |
|
6534 NEW CINGULAR WIRELESS PCS, LLC - IL |
358 |
|
2015-07-22 |
|
| 312-874
| 1 |
Chicago Zone 01-Calumet |
IL |
|
6534 NEW CINGULAR WIRELESS PCS, LLC - IL |
358 |
|
2015-07-22 |
|
| 312-874
| 2 |
Chicago Zone 01-Calumet |
IL |
|
6534 NEW CINGULAR WIRELESS PCS, LLC - IL |
358 |
|
2015-07-22 |
|
| 312-874
| 3 |
Chicago Zone 01-Calumet |
IL |
|
6534 NEW CINGULAR WIRELESS PCS, LLC - IL |
358 |
|
2015-07-22 |
|
| 312-874
| 4 |
Chicago Zone 01-Calumet |
IL |
|
6534 NEW CINGULAR WIRELESS PCS, LLC - IL |
358 |
|
2015-07-22 |
|
| 312-874
| 5 |
Chicago Zone 01-Calumet |
IL |
|
224C ONVOY, LLC |
358 |
|
2015-07-28 |
|
| 312-874
| 6 |
Chicago Zone 01-Calumet |
IL |
|
224C ONVOY, LLC |
358 |
|
2015-07-28 |
|
| 312-874
| 7 |
Chicago Zone 01-Calumet |
IL |
|
224C ONVOY, LLC |
358 |
|
2015-07-28 |
|
| 312-874
| 8 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2015-07-20 |
|
| 312-874
| 9 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2015-07-20 |
|
| 312-875
| A |
Chicago Zone 01-Canal |
IL |
CHCGILCLDS3 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-876
| A |
Chicago Zone 01-Canal |
IL |
CHCGILCLDS0 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-877
| A |
Chicago Zone 01-Calumet |
IL |
CHCGILCLXOX |
516C AT&T CORP. |
358 |
|
|
|
| 312-877
| 0 |
Chicago Zone 01-Calumet |
IL |
|
6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
358 |
|
2014-09-13 |
|
| 312-877
| 1 |
Chicago Zone 01-Calumet |
IL |
|
6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
358 |
|
2014-09-13 |
|
| 312-877
| 2 |
Chicago Zone 01-Calumet |
IL |
|
6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
358 |
|
2014-09-13 |
|
| 312-877
| 3 |
Chicago Zone 01-Calumet |
IL |
|
6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
358 |
|
2014-09-13 |
|
| 312-877
| 4 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-09-19 |
|
| 312-877
| 5 |
Chicago Zone 01-Calumet |
IL |
|
516C AT&T CORP. |
358 |
|
2014-09-11 |
|
| 312-877
| 6 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-09-19 |
|
| 312-877
| 7 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-09-19 |
|
| 312-877
| 8 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-09-19 |
|
| 312-877
| 9 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-09-19 |
|
| 312-878
| A |
Chicago Zone 01-Calumet |
IL |
CHCGILWUDS4 |
063E PEERLESS NETWORK OF ILLINOIS, LLC - IL |
358 |
|
|
|
| 312-878
| 0 |
Chicago Zone 01-Calumet |
IL |
|
063E PEERLESS NETWORK OF ILLINOIS, LLC - IL |
358 |
|
2008-05-10 |
|
| 312-878
| 1 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
2008-06-09 |
|
| 312-878
| 2 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
2008-06-12 |
|
| 312-878
| 3 |
Chicago Zone 01-Calumet |
IL |
|
063E PEERLESS NETWORK OF ILLINOIS, LLC - IL |
358 |
|
2008-03-27 |
|
| 312-878
| 4 |
Chicago Zone 01-Calumet |
IL |
|
063E PEERLESS NETWORK OF ILLINOIS, LLC - IL |
358 |
|
2008-03-27 |
|
| 312-878
| 5 |
Chicago Zone 01-Calumet |
IL |
|
063E PEERLESS NETWORK OF ILLINOIS, LLC - IL |
358 |
|
2008-03-27 |
|
| 312-878
| 6 |
Chicago Zone 01-Calumet |
IL |
|
063E PEERLESS NETWORK OF ILLINOIS, LLC - IL |
358 |
|
2008-03-27 |
|
| 312-878
| 7 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
2008-06-12 |
|
| 312-878
| 8 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
2008-06-12 |
|
| 312-878
| 9 |
Chicago Zone 01-Calumet |
IL |
|
063E PEERLESS NETWORK OF ILLINOIS, LLC - IL |
358 |
|
2008-05-10 |
|
| 312-879
| A |
Chicago Zone 01-Canal |
IL |
CHCGILCLDS0 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-879
| 0 |
Chicago Zone 01-Canal |
IL |
|
624H ONVOY SPECTRUM, LLC |
358 |
|
2022-01-07 |
|
| 312-879
| 1 |
Chicago Zone 01-Canal |
IL |
|
321J HD CARRIER LLC |
358 |
|
2025-10-11 |
|
| 312-879
| 2 |
Chicago Zone 01-Canal |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-879
| 3 |
Chicago Zone 01-Canal |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-879
| 4 |
Chicago Zone 01-Canal |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-879
| 5 |
Chicago Zone 01-Canal |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-879
| 6 |
Chicago Zone 01-Canal |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-879
| 7 |
Chicago Zone 01-Canal |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-879
| 8 |
Chicago Zone 01-Canal |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-879
| 9 |
Chicago Zone 01-Canal |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2012-01-13 |
|
| 312-880
| A |
Chicago Zone 01-Wabash |
IL |
CHCGILWBDS2 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
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Last updated: Thu, 29 Jan 2026 14:35:03 UTC
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