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 |
| 312-423
| 1 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-423
| 2 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-423
| 3 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-423
| 4 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-423
| 5 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-423
| 6 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-423
| 7 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-423
| 8 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-423
| 9 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-424
| A |
Chicago Zone 01-Franklin |
IL |
CHCGILFRDS1 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-425
| A |
Chicago Zone 01-Franklin |
IL |
CHCGILFRDS3 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-427
| A |
Chicago Zone 01-Wabash |
IL |
CHCGILWBDS0 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-428
| A |
Chicago Zone 01-Wabash |
IL |
CHCGILGMDS7 |
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-428
| 0 |
Chicago Zone 01-Wabash |
IL |
|
6534 NEW CINGULAR WIRELESS PCS, LLC - IL |
358 |
|
2009-01-06 |
|
| 312-428
| 1 |
Chicago Zone 01-Wabash |
IL |
|
6534 NEW CINGULAR WIRELESS PCS, LLC - IL |
358 |
|
2009-01-06 |
|
| 312-428
| 2 |
Chicago Zone 01-Wabash |
IL |
|
829J PAETEC ITEL, LLC |
358 |
|
2009-10-23 |
|
| 312-428
| 3 |
Chicago Zone 01-Wabash |
IL |
|
7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
358 |
|
2010-02-14 |
|
| 312-428
| 4 |
Chicago Zone 01-Wabash |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
2004-06-07 |
|
| 312-428
| 5 |
Chicago Zone 01-Wabash |
IL |
|
224C ONVOY, LLC |
358 |
|
2009-09-04 |
|
| 312-428
| 6 |
Chicago Zone 01-Wabash |
IL |
|
224C ONVOY, LLC |
358 |
|
2009-09-04 |
|
| 312-428
| 7 |
Chicago Zone 01-Wabash |
IL |
|
224C ONVOY, LLC |
358 |
|
2009-09-04 |
|
| 312-428
| 8 |
Chicago Zone 01-Wabash |
IL |
|
6534 NEW CINGULAR WIRELESS PCS, LLC - IL |
358 |
|
2009-01-06 |
|
| 312-428
| 9 |
Chicago Zone 01-Wabash |
IL |
|
224C ONVOY, LLC |
358 |
|
2009-09-04 |
|
| 312-429
| A |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-429
| 0 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-429
| 1 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-429
| 2 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-429
| 3 |
Chicago Zone 01-Calumet |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
2002-06-05 |
|
| 312-429
| 4 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-429
| 5 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-429
| 6 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-429
| 7 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-429
| 8 |
Chicago Zone 01-Calumet |
IL |
|
7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL |
358 |
|
|
|
| 312-429
| 9 |
Chicago Zone 01-Calumet |
IL |
|
6115 LEVEL 3 COMMUNICATIONS, LLC - IL |
358 |
|
|
|
| 312-430
| A |
Chicago Zone 01-Canal |
IL |
CHCGILCLDS3 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-431
| A |
Chicago Zone 01-Wabash |
IL |
CHCGILWBDS3 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-432
| A |
Chicago Zone 01-Monroe |
IL |
CHCGILMODS1 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-433
| A |
Chicago Zone 01-Monroe |
IL |
CHCGILMODS0 |
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-433
| 0 |
Chicago Zone 01-Monroe |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-433
| 1 |
Chicago Zone 01-Monroe |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-433
| 2 |
Chicago Zone 01-Monroe |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-433
| 3 |
Chicago Zone 01-Monroe |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-433
| 4 |
Chicago Zone 01-Monroe |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-433
| 5 |
Chicago Zone 01-Monroe |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-433
| 6 |
Chicago Zone 01-Monroe |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-433
| 7 |
Chicago Zone 01-Monroe |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-433
| 8 |
Chicago Zone 01-Monroe |
IL |
|
9329 ILLINOIS BELL TEL CO |
358 |
|
|
|
| 312-433
| 9 |
Chicago Zone 01-Monroe |
IL |
|
6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL |
358 |
|
2011-01-14 |
|
| 312-434
| A |
Chicago Zone 01-Calumet |
IL |
ELGNILOTGT5 |
6529 T-MOBILE USA, INC. |
358 |
|
|
|
| 312-434
| 0 |
Chicago Zone 01-Calumet |
IL |
|
6529 T-MOBILE USA, INC. |
358 |
|
2011-08-22 |
|
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Last updated: Thu, 29 Jan 2026 14:35:03 UTC
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