Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 309 [Rate centres in NPA 309] [Dial plan for NPA 309]

NXX: 599

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
309-599 A London Mills IL MCMBILXDJMD  593K MCC TELEPHONY LLC 977      
309-599 0 London Mills IL   495J STRATUS NETWORKS 977   2021-02-28   
309-599 1 London Mills IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 977   2020-05-31   
309-599 2 London Mills IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 977   2021-03-29   
309-599 3 London Mills IL   224C ONVOY, LLC 977   2021-07-05   
309-599 5 London Mills IL   624H ONVOY SPECTRUM, LLC 977   2023-07-29   
309-599 7 London Mills IL   508J CENTURYLINK COMMUNICATIONS, LLC 977   2014-07-29   
309-599 8 London Mills IL   593K MCC TELEPHONY LLC 977   2010-07-24   
309-599 9 London Mills IL   224C ONVOY, LLC 977   2020-03-13   

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

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