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: STLSMOGZ8MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
314-944 A St Louis MO 939H COMMIO, LLC 520      
573-951 A Annapolis MO 939H COMMIO, LLC 520      
573-954 A Beaufort MO 939H COMMIO, LLC 520      
573-960 A Canton MO 939H COMMIO, LLC 520      
573-961 A Chaffee MO 939H COMMIO, LLC 520      
618-807 A Alhambra IL 939H COMMIO, LLC 520      

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

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