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 |
| 312-970
| 2 |
Chicago Zone 01-Illinois Dearborn |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-970
| 3 |
Chicago Zone 01-Illinois Dearborn |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-970
| 4 |
Chicago Zone 01-Illinois Dearborn |
IL |
|
5562 METROPCS, INC. |
358 |
|
2016-12-29 |
|
| 312-970
| 5 |
Chicago Zone 01-Illinois Dearborn |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-970
| 6 |
Chicago Zone 01-Illinois Dearborn |
IL |
|
5562 METROPCS, INC. |
358 |
|
2017-01-23 |
|
| 312-970
| 7 |
Chicago Zone 01-Illinois Dearborn |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
2001-04-23 |
|
| 312-970
| 8 |
Chicago Zone 01-Illinois Dearborn |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-970
| 9 |
Chicago Zone 01-Illinois Dearborn |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2009-01-13 |
|
| 312-971
| A |
Chicago Zone 01-Calumet |
IL |
CHCGILWBXDZ |
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
|
|
| 312-971
| 0 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2014-06-28 |
|
| 312-971
| 1 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2014-06-28 |
|
| 312-971
| 2 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2014-06-28 |
|
| 312-971
| 3 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2014-06-28 |
|
| 312-971
| 4 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2014-06-28 |
|
| 312-971
| 5 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2014-06-28 |
|
| 312-971
| 6 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2014-06-28 |
|
| 312-971
| 7 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2014-06-28 |
|
| 312-971
| 8 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2014-06-28 |
|
| 312-971
| 9 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2014-06-28 |
|
| 312-972
| A |
Chicago Zone 01-Wabash |
IL |
BURGILAHGT3 |
6534 NEW CINGULAR WIRELESS PCS, LLC - IL |
358 |
|
|
|
| 312-973
| A |
Chicago Zone 01-Calumet |
IL |
BNSVILDGDS0 |
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
358 |
|
|
|
| 312-973
| 0 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-04-15 |
|
| 312-973
| 1 |
Chicago Zone 01-Calumet |
IL |
|
984E BANDWIDTH.COM CLEC, LLC - IL |
358 |
|
2014-05-24 |
|
| 312-973
| 2 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-04-15 |
|
| 312-973
| 3 |
Chicago Zone 01-Calumet |
IL |
|
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
358 |
|
2014-04-12 |
|
| 312-973
| 4 |
Chicago Zone 01-Calumet |
IL |
|
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
358 |
|
2014-04-12 |
|
| 312-973
| 5 |
Chicago Zone 01-Calumet |
IL |
|
138G LEVEL 3 TELECOM OF ILLINOIS, LLC - IL |
358 |
|
2014-04-15 |
|
| 312-973
| 6 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-04-15 |
|
| 312-973
| 7 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-04-15 |
|
| 312-973
| 8 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-04-15 |
|
| 312-973
| 9 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-04-15 |
|
| 312-974
| A |
Chicago Zone 01-Wabash |
IL |
CHCGILWBDS2 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-975
| A |
Chicago Zone 01-Calumet |
IL |
ELGNILOTGT5 |
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-975
| 0 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2015-07-08 |
|
| 312-975
| 1 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2015-07-08 |
|
| 312-975
| 2 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2015-07-08 |
|
| 312-975
| 3 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2015-07-08 |
|
| 312-975
| 4 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2015-07-08 |
|
| 312-975
| 5 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2015-07-08 |
|
| 312-975
| 6 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-11-14 |
|
| 312-975
| 7 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-11-14 |
|
| 312-975
| 8 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-11-14 |
|
| 312-975
| 9 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2014-11-14 |
|
| 312-977
| A |
Chicago Zone 01-Franklin |
IL |
CHCGILFRDS3 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-978
| A |
Chicago Zone 01-Calumet |
IL |
ELGNILOTGT5 |
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-978
| 0 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2013-12-06 |
|
| 312-978
| 1 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2013-12-06 |
|
| 312-978
| 2 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2013-12-06 |
|
| 312-978
| 3 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2013-12-06 |
|
| 312-978
| 4 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2013-12-06 |
|
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Last updated: Thu, 29 Jan 2026 14:35:03 UTC
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