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.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Switch: TRYNOKXADS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
918-374 A Tryon OK 1977 CENTRAL OKLAHOMA TELEPHONE CO., L.L.C. 538      
918-375 A Agra OK 1977 CENTRAL OKLAHOMA TELEPHONE CO., L.L.C. 538      
918-375 0 Agra OK 1977 CENTRAL OKLAHOMA TELEPHONE CO., L.L.C. 538      
918-375 2 Agra OK 1977 CENTRAL OKLAHOMA TELEPHONE CO., L.L.C. 538      

Last updated: Wed, 04 Mar 2026 03:00:52 UTC

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