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: 449

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
312-449 A Chicago Zone 01-Calumet IL   700J WAVENATION, LLC 358   2025-09-14   
312-449 0 Chicago Zone 01-Calumet IL   700J WAVENATION, LLC 358   2025-09-14   
312-449 1 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2025-09-30   
312-449 2 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2025-09-30   
312-449 3 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2025-09-30   
312-449 4 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2025-09-30   
312-449 5 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2025-09-30   
312-449 6 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2025-09-30   
312-449 7 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2025-09-30   
312-449 8 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2025-09-30   
312-449 9 Chicago Zone 01-Calumet IL   224C ONVOY, LLC 358   2025-09-30   

Last updated: Mon, 15 Sep 2025 02:24:40 UTC

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