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: HLBOMO01DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
314-329 2 Mehlville MO 7421 AT&T - LOCAL 520   2002-12-09   
636-299 A Chesterfield MO 7421 AT&T - LOCAL 520      
636-299 9 Chesterfield MO 7421 AT&T - LOCAL 520      
636-627 A St Charles MCA3 MO 7421 AT&T - LOCAL 520      
636-627 0 St Charles MCA3 MO 7421 AT&T - LOCAL 520      

Last updated: Wed, 01 Jun 2022 03:09:23 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.