Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Knoxville, OH

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
740-544 A KNVLOHXARS0  0615 FRONTIER NORTH, INC. - OH 324      
740-544 1   145J TERRA NOVA TELECOM INC. 324   2025-07-19   
740-544 2 CLMDOHZI6MD  4863 LEVEL 3 COMMUNICATIONS, LLC - OH 324   2018-02-16   
740-544 3 CLMBOH1151Z  318J COMCAST IP PHONE, LLC 324   2023-05-26   
740-544 4 CLMDOH44JMD  965H FRACTEL, LLC 324   2020-03-07   
740-544 5 KNVLOHXARS0  0615 FRONTIER NORTH, INC. - OH 324      
740-544 6 KNVLOHXARS0  0615 FRONTIER NORTH, INC. - OH 324      
740-544 7 CLMBOH1125Z  508J CENTURYLINK COMMUNICATIONS, LLC 324   2014-07-03   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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