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: STLSMO09WMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
314-224 A St Louis MO 516C AT&T CORP. 520      
314-240 A St Louis MO 516C AT&T CORP. 520      
314-287 A Kirkwood MO 516C AT&T CORP. 520      
314-325 A Ladue MO 516C AT&T CORP. 520      
314-379 A St Louis MO 516C AT&T CORP. 520      
314-698 A Kirkwood MO 516C AT&T CORP. 520      
573-525 A Camdenton MO 516C AT&T CORP. 520      
573-534 A Bonne Terre MO 516C AT&T CORP. 520      
573-955 A Bismarck MO 516C AT&T CORP. 520      
636-206 A St Charles MO 516C AT&T CORP. 520      
636-395 A St Charles MO 516C AT&T CORP. 520      

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

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