Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 815 [Rate centres in NPA 815] [Dial plan for NPA 815]

NXX: 437

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
815-437 A Putnam IL PTNMILXDDS0  1036 FRONTIER NORTH, INC. - IL 368      
815-437 1 Putnam IL   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 368   2015-11-05   
815-437 2 Putnam IL   1036 FRONTIER NORTH, INC. - IL 368      
815-437 3 Putnam IL   624H ONVOY SPECTRUM, LLC 368   2024-12-02   
815-437 4 Putnam IL   224C ONVOY, LLC 368   2024-12-30   
815-437 7 Putnam IL   508J CENTURYLINK COMMUNICATIONS, LLC 368   2016-08-05   
815-437 8 Putnam IL   495J STRATUS NETWORKS 368   2020-08-02   
815-437 9 Putnam IL   1036 FRONTIER NORTH, INC. - IL 368      

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

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