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: 450

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
618-450 A Mount Carmel IL OLNYILXEX4X  506J TWILIO INTERNATIONAL, INC. 978      
618-450 3 Mount Carmel IL   224C ONVOY, LLC 978   2021-12-03   
618-450 4 Mount Carmel IL   224C ONVOY, LLC 978   2021-12-03   
618-450 5 Mount Carmel IL   224C ONVOY, LLC 978   2021-02-12   
618-450 6 Mount Carmel IL   224C ONVOY, LLC 978   2023-10-16   
618-450 7 Mount Carmel IL   224C ONVOY, LLC 978   2023-10-16   
618-450 8 Mount Carmel IL   506J TWILIO INTERNATIONAL, INC. 978   2022-06-17   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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