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: STLSMO05XMX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
314-618 A Ladue MO 624H ONVOY SPECTRUM, LLC 520      
314-673 A Creve Coeur MO 624H ONVOY SPECTRUM, LLC 520      
314-710 A St Louis MO 624H ONVOY SPECTRUM, LLC 520      
557-500 A St Louis MO 624H ONVOY SPECTRUM, LLC 520      
557-507 A St Louis MO 624H ONVOY SPECTRUM, LLC 520      
557-567 A Kirkwood MO 624H ONVOY SPECTRUM, LLC 520   2025-01-02   
573-580 A Belle MO 624H ONVOY SPECTRUM, LLC 520      
573-980 A Bonne Terre MO 624H ONVOY SPECTRUM, LLC 520   2024-05-30   
573-981 A Camdenton MO 624H ONVOY SPECTRUM, LLC 520   2024-05-30   
573-991 A Mexico MO 624H ONVOY SPECTRUM, LLC 520   2024-05-30   
636-635 A Cedar Hill MO 624H ONVOY SPECTRUM, LLC 520      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.