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: 636 [Rate centres in NPA 636] [Dial plan for NPA 636]

NXX: 473

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
636-473 A Antonia MO STLSMO09X6X  7421 AT&T - LOCAL 520   2025-09-19   
636-473 7 Antonia MO   114J EXIANT COMMUNICATIONS LLC 520   2026-09-26   
636-473 9 Antonia MO STLSMO09X6X  7421 AT&T - LOCAL 520   2025-09-19   

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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