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: STLSMO09DS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
314-450 A St Louis MO 7421 AT&T - LOCAL 520      
314-450 2 St Louis MO 7421 AT&T - LOCAL 520      
314-450 3 St Louis MO 7421 AT&T - LOCAL 520      
314-450 9 St Louis MO 7421 AT&T - LOCAL 520      
314-548 A Creve Coeur MO 7421 AT&T - LOCAL 520      
314-548 4 Creve Coeur MO 7421 AT&T - LOCAL 520      
618-255 8 Wood River IL 7421 AT&T - LOCAL 520   2012-08-12   
618-301 5 Collinsville IL 7421 AT&T - LOCAL 520   2003-12-16   
618-316 5 Mount Vernon IL 7421 AT&T - LOCAL 520   2003-10-21   
618-374 7 Alton IL 7421 AT&T - LOCAL 520   2003-02-16   
618-823 4 Granite City IL 7421 AT&T - LOCAL 520   2009-07-17   
636-263 A Harvester MCA4 MO 7421 AT&T - LOCAL 520      
636-263 2 Harvester MCA4 MO 7421 AT&T - LOCAL 520      

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

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