Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 312 [Rate centres in NPA 312] [Dial plan for NPA 312]

NXX: 564

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
312-564 A Chicago Zone 01-Calumet IL CHCGILAEDS3  5917 FIRST COMMUNICATIONS, LLC 358      
312-564 0 Chicago Zone 01-Calumet IL CHCGILAEDS3  5917 FIRST COMMUNICATIONS, LLC 358   2007-01-04   
312-564 1 Chicago Zone 01-Calumet IL CHCGILAEDS3  5917 FIRST COMMUNICATIONS, LLC 358   2007-01-04   
312-564 2 Chicago Zone 01-Calumet IL CHCGILAEDS3  5917 FIRST COMMUNICATIONS, LLC 358   2007-01-04   
312-564 3 Chicago Zone 01-Calumet IL CHCGILAEDS3  5917 FIRST COMMUNICATIONS, LLC 358   2007-01-04   
312-564 4 Chicago Zone 01-Calumet IL CHCGIL24DS6  224C ONVOY, LLC 358   2007-07-03   
312-564 5 Chicago Zone 01-Calumet IL CHCGIL24DS6  224C ONVOY, LLC 358   2007-07-19   
312-564 6 Chicago Zone 01-Calumet IL CHCGILAEDS3  5917 FIRST COMMUNICATIONS, LLC 358   2007-01-04   
312-564 7 Chicago Zone 01-Calumet IL CHCGILWUX1X  7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358   2007-11-16   
312-564 8 Chicago Zone 01-Calumet IL CHCGILWUX1X  7765 OVATION COMMUNICATIONS OF ILLINOIS, INC. 358   2007-11-16   
312-564 9 Chicago Zone 01-Calumet IL CHCGILAEDS3  5917 FIRST COMMUNICATIONS, LLC 358   2007-01-04   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

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