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 |
| 312-734
| A |
Chicago Zone 01-Calumet |
IL |
CHCGILCGDS1 |
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
|
|
| 312-734
| 0 |
Chicago Zone 01-Calumet |
IL |
|
5562 METROPCS, INC. |
358 |
|
2015-12-05 |
|
| 312-734
| 1 |
Chicago Zone 01-Calumet |
IL |
|
224C ONVOY, LLC |
358 |
|
2015-11-25 |
|
| 312-734
| 2 |
Chicago Zone 01-Calumet |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
2015-11-01 |
|
| 312-734
| 3 |
Chicago Zone 01-Calumet |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
2015-11-01 |
|
| 312-734
| 4 |
Chicago Zone 01-Calumet |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
2015-11-01 |
|
| 312-734
| 5 |
Chicago Zone 01-Calumet |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
2015-11-01 |
|
| 312-734
| 6 |
Chicago Zone 01-Calumet |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
2015-11-01 |
|
| 312-734
| 7 |
Chicago Zone 01-Calumet |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
2015-11-01 |
|
| 312-734
| 8 |
Chicago Zone 01-Calumet |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
2015-11-01 |
|
| 312-734
| 9 |
Chicago Zone 01-Calumet |
IL |
|
5562 METROPCS, INC. |
358 |
|
2015-12-05 |
|
| 312-735
| A |
Chicago Zone 04-Humboldt |
IL |
ELGNILOTGT5 |
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-735
| 0 |
Chicago Zone 04-Humboldt |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-735
| 1 |
Chicago Zone 04-Humboldt |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-735
| 2 |
Chicago Zone 04-Humboldt |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-735
| 3 |
Chicago Zone 04-Humboldt |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-735
| 4 |
Chicago Zone 04-Humboldt |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-735
| 5 |
Chicago Zone 04-Humboldt |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-735
| 6 |
Chicago Zone 04-Humboldt |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-735
| 7 |
Chicago Zone 04-Humboldt |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-735
| 8 |
Chicago Zone 04-Humboldt |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-735
| 9 |
Chicago Zone 04-Humboldt |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-736
| A |
Chicago Zone 01-Calumet |
IL |
OKBRILOAXEX |
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
|
|
| 312-736
| 0 |
Chicago Zone 01-Calumet |
IL |
|
073H TELNYX LLC |
358 |
|
2018-07-05 |
|
| 312-736
| 1 |
Chicago Zone 01-Calumet |
IL |
|
5447 ACCESS ONE, INC. - IL |
358 |
|
2018-03-16 |
|
| 312-736
| 2 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2018-07-26 |
|
| 312-736
| 3 |
Chicago Zone 01-Calumet |
IL |
|
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
358 |
|
2018-08-17 |
|
| 312-736
| 4 |
Chicago Zone 01-Calumet |
IL |
|
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
358 |
|
2018-08-17 |
|
| 312-736
| 5 |
Chicago Zone 01-Calumet |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
2017-12-22 |
|
| 312-736
| 6 |
Chicago Zone 01-Calumet |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
2017-12-22 |
|
| 312-736
| 7 |
Chicago Zone 01-Calumet |
IL |
|
073H TELNYX LLC |
358 |
|
2018-11-14 |
|
| 312-736
| 8 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2018-07-26 |
|
| 312-736
| 9 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
2019-02-16 |
|
| 312-737
| A |
Chicago Zone 01-Franklin |
IL |
CHCGILFRDS4 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-738
| A |
Chicago Zone 01-Monroe |
IL |
CHCGILMODS0 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-739
| A |
Chicago Zone 01-Franklin |
IL |
CHCGILFRDS3 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-740
| A |
Chicago Zone 01-Wabash |
IL |
CHCGILBWCM2 |
9748 AMERICAN MESSAGING SERVICES, LLC |
358 |
|
|
|
| 312-741
| A |
Chicago Zone 01-Calumet |
IL |
CHCGILWBXWZ |
829J PAETEC ITEL, LLC |
358 |
|
2024-12-09 |
|
| 312-741
| 0 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2018-06-01 |
|
| 312-741
| 1 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2018-06-01 |
|
| 312-741
| 2 |
Chicago Zone 01-Calumet |
IL |
|
829J PAETEC ITEL, LLC |
358 |
|
2017-12-22 |
|
| 312-741
| 3 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2018-06-01 |
|
| 312-741
| 4 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2018-06-01 |
|
| 312-741
| 5 |
Chicago Zone 01-Calumet |
IL |
|
829J PAETEC ITEL, LLC |
358 |
|
2017-12-22 |
|
| 312-741
| 6 |
Chicago Zone 01-Calumet |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
2019-06-20 |
|
| 312-741
| 7 |
Chicago Zone 01-Calumet |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
2018-09-24 |
|
| 312-741
| 8 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
2018-10-15 |
|
| 312-741
| 9 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2018-12-20 |
|
| 312-742
| A |
Chicago Zone 01-Illinois Dearborn |
IL |
CHCGILIDDS0 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-743
| A |
Chicago Zone 01-Monroe |
IL |
CHCGILMODS1 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
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Last updated: Thu, 29 Jan 2026 14:35:03 UTC
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