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: 580 [Rate centres in NPA 580] [Dial plan for NPA 580]

NXX: 636

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
580-636 A Altus OK   6272 UNITED STATES CELLULAR - OK 536   2025-08-07   
580-636 0 Altus OK   6272 UNITED STATES CELLULAR - OK 536   2025-08-07   
580-636 1 Altus OK   6272 UNITED STATES CELLULAR - OK 536   2025-08-07   
580-636 2 Altus OK   6272 UNITED STATES CELLULAR - OK 536   2025-08-07   
580-636 3 Altus OK   6272 UNITED STATES CELLULAR - OK 536   2025-08-07   
580-636 4 Altus OK   6272 UNITED STATES CELLULAR - OK 536   2025-08-07   

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

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