Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 660 [Rate centres in NPA 660] [Dial plan for NPA 660]

NXX: 230

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
660-230 A Calhoun MO KSCZMODR3MD  4932 LEVEL 3 COMMUNICATIONS, LLC - MO 524      
660-230 0 Calhoun MO   4932 LEVEL 3 COMMUNICATIONS, LLC - MO 524      
660-230 1 Calhoun MO   225F PEERLESS NETWORK OF MISSOURI, LLC - MO 524   2014-04-20   
660-230 2 Calhoun MO   093F ONVOY, LLC - MO 524   2018-10-28   
660-230 3 Calhoun MO   073H TELNYX LLC 524   2020-07-30   
660-230 4 Calhoun MO   4932 LEVEL 3 COMMUNICATIONS, LLC - MO 524      
660-230 7 Calhoun MO   508J CENTURYLINK COMMUNICATIONS, LLC 524   2013-10-31   

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

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