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: 620 [Rate centres in NPA 620] [Dial plan for NPA 620]

NXX: 365

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
620-365 A Iola KS IOLAKSSYDS0  9533 SOUTHWESTERN BELL 532      

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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