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: 730 [Rate centres in NPA 730] [Dial plan for NPA 730]

NXX: 737

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
730-737 A Chesterfield-Rockbridge IL STLSMO05XMX  624H ONVOY SPECTRUM, LLC 520   2025-03-02   
730-737 0 Chesterfield-Rockbridge IL STLSMO05XMX  624H ONVOY SPECTRUM, LLC 520   2025-03-02   
730-737 7 Chesterfield-Rockbridge IL   145J TERRA NOVA TELECOM INC. 520   2025-06-01   

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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