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: 288

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
309-288 A Mineral IL MNRLILXDRS1  1015 FRONTIER NORTH, INC. - IL 368      
309-288 0 Mineral IL   846F MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 368   2010-04-15   
309-288 1 Mineral IL   1015 FRONTIER NORTH, INC. - IL 368      
309-288 2 Mineral IL   224C ONVOY, LLC 368   2021-12-03   
309-288 3 Mineral IL   1015 FRONTIER NORTH, INC. - IL 368      
309-288 4 Mineral IL   224C ONVOY, LLC 368   2021-06-06   
309-288 5 Mineral IL   224C ONVOY, LLC 368   2023-07-22   
309-288 6 Mineral IL   145J TERRA NOVA TELECOM INC. 368   2025-06-06   
309-288 7 Mineral IL   508J CENTURYLINK COMMUNICATIONS, LLC 368   2016-08-04   
309-288 8 Mineral IL   965H FRACTEL, LLC 368   2019-11-13   
309-288 9 Mineral IL   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 368   2015-11-02   

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

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