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 |
| 312-773
| A |
Chicago Zone 01-Calumet |
IL |
CHCGILIDXDX |
624H ONVOY SPECTRUM, LLC |
358 |
|
|
|
| 312-773
| 0 |
Chicago Zone 01-Calumet |
IL |
|
624H ONVOY SPECTRUM, LLC |
358 |
|
2023-07-22 |
|
| 312-773
| 1 |
Chicago Zone 01-Calumet |
IL |
|
624H ONVOY SPECTRUM, LLC |
358 |
|
2023-07-22 |
|
| 312-773
| 2 |
Chicago Zone 01-Calumet |
IL |
|
624H ONVOY SPECTRUM, LLC |
358 |
|
2023-07-22 |
|
| 312-773
| 3 |
Chicago Zone 01-Calumet |
IL |
|
624H ONVOY SPECTRUM, LLC |
358 |
|
2023-07-22 |
|
| 312-773
| 4 |
Chicago Zone 01-Calumet |
IL |
|
624H ONVOY SPECTRUM, LLC |
358 |
|
2023-07-22 |
|
| 312-773
| 5 |
Chicago Zone 01-Calumet |
IL |
|
624H ONVOY SPECTRUM, LLC |
358 |
|
2023-07-22 |
|
| 312-773
| 6 |
Chicago Zone 01-Calumet |
IL |
|
624H ONVOY SPECTRUM, LLC |
358 |
|
2023-07-22 |
|
| 312-773
| 7 |
Chicago Zone 01-Calumet |
IL |
|
624H ONVOY SPECTRUM, LLC |
358 |
|
2023-07-22 |
|
| 312-773
| 8 |
Chicago Zone 01-Calumet |
IL |
|
624H ONVOY SPECTRUM, LLC |
358 |
|
2023-07-22 |
|
| 312-773
| 9 |
Chicago Zone 01-Calumet |
IL |
|
624H ONVOY SPECTRUM, LLC |
358 |
|
2023-07-22 |
|
| 312-774
| A |
Chicago Zone 01-Calumet |
IL |
ELGNILOTGT5 |
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-774
| 0 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2013-10-03 |
|
| 312-774
| 1 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2013-10-03 |
|
| 312-774
| 2 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2013-10-03 |
|
| 312-774
| 3 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2013-10-03 |
|
| 312-774
| 4 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2013-10-03 |
|
| 312-774
| 5 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2013-10-03 |
|
| 312-774
| 6 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2013-10-03 |
|
| 312-774
| 7 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2013-10-03 |
|
| 312-774
| 8 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2013-10-03 |
|
| 312-774
| 9 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2013-10-03 |
|
| 312-775
| A |
Chicago Zone 01-Canal |
IL |
CHCGILCLDS3 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-775
| 0 |
Chicago Zone 01-Canal |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-775
| 1 |
Chicago Zone 01-Canal |
IL |
|
829J PAETEC ITEL, LLC |
358 |
|
2008-03-31 |
|
| 312-775
| 2 |
Chicago Zone 01-Canal |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2010-03-04 |
|
| 312-775
| 3 |
Chicago Zone 01-Canal |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-775
| 4 |
Chicago Zone 01-Canal |
IL |
|
829J PAETEC ITEL, LLC |
358 |
|
2011-04-20 |
|
| 312-775
| 5 |
Chicago Zone 01-Canal |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-775
| 6 |
Chicago Zone 01-Canal |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-775
| 7 |
Chicago Zone 01-Canal |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-775
| 8 |
Chicago Zone 01-Canal |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-775
| 9 |
Chicago Zone 01-Canal |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-776
| A |
Chicago Zone 01-Calumet |
IL |
ELGNILOTGT5 |
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-776
| 0 |
Chicago Zone 01-Calumet |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
2019-05-27 |
|
| 312-776
| 1 |
Chicago Zone 01-Calumet |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
2019-05-27 |
|
| 312-776
| 2 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
2019-05-24 |
|
| 312-776
| 3 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
2019-05-24 |
|
| 312-776
| 4 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2019-03-31 |
|
| 312-776
| 5 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2019-03-31 |
|
| 312-776
| 6 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2019-03-31 |
|
| 312-776
| 7 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2019-03-31 |
|
| 312-776
| 8 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2019-03-31 |
|
| 312-776
| 9 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2019-03-31 |
|
| 312-777
| A |
Chicago Zone 01-Wabash |
IL |
CHCGIL24DS0 |
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
|
|
| 312-777
| 0 |
Chicago Zone 01-Wabash |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
|
|
| 312-777
| 1 |
Chicago Zone 01-Wabash |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
|
|
| 312-777
| 2 |
Chicago Zone 01-Wabash |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
|
|
| 312-777
| 3 |
Chicago Zone 01-Wabash |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
|
|
| 312-777
| 4 |
Chicago Zone 01-Wabash |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
|
|
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Last updated: Thu, 29 Jan 2026 14:35:03 UTC
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