Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 618 [Rate centres in NPA 618] [Dial plan for NPA 618]

NXX: 454

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
618-454 A Oblong IL OLNYILXEHMD  846F MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 978      
618-454 4 Oblong IL OLNYILXEGMD  224C ONVOY, LLC 978   2021-04-09   
618-454 6 Oblong IL OLNYILXEFMD  7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 978   2023-05-03   

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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