Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
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NPA: 918 [Rate centres in NPA 918] [Dial plan for NPA 918]

NXX: 623

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
918-623 A Okemah OK OKMHOKMARS1  9533 SOUTHWESTERN BELL 538      
918-623 0 Okemah OK   9533 SOUTHWESTERN BELL 538      
918-623 1 Okemah OK   9533 SOUTHWESTERN BELL 538      
918-623 2 Okemah OK   9533 SOUTHWESTERN BELL 538      
918-623 3 Okemah OK   9533 SOUTHWESTERN BELL 538      
918-623 4 Okemah OK   119F BANDWIDTH.COM CLEC, LLC - OK 538   2014-05-17   
918-623 5 Okemah OK   384H PEERLESS NETWORK OF OKLAHOMA, LLC - OK 538   2016-03-04   
918-623 6 Okemah OK   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 538      
918-623 7 Okemah OK   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 538      
918-623 8 Okemah OK   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 538      
918-623 9 Okemah OK   9533 SOUTHWESTERN BELL 538      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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