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: CHFDMO52DSA

Remotes:

Switch Switch name Switch type
BUFTMOHURS3  BEAUFORT  5ER 
EURKMO53RS0  EUREKA  5ER 
GRSMMO55RS2  GRAY SUMMIT  5ER 
PONDMO62RS4  POND  5ER 
STLSMO01RS5  ST LOUIS  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
636-247 A Chesterfield MCA3 MO 9533 SOUTHWESTERN BELL 520      
636-519 A Chesterfield MCA3 MO 9533 SOUTHWESTERN BELL 520      
636-530 A Chesterfield MCA3 MO 9533 SOUTHWESTERN BELL 520      
636-532 A Chesterfield MCA3 MO 9533 SOUTHWESTERN BELL 520      
636-536 A Chesterfield MO 9533 SOUTHWESTERN BELL 520      
636-537 A Chesterfield MCA3 MO 9533 SOUTHWESTERN BELL 520      
636-728 A Chesterfield MCA3 MO 9533 SOUTHWESTERN BELL 520      
636-730 A Chesterfield MO 9533 SOUTHWESTERN BELL 520      
636-733 A Chesterfield MCA3 MO 9533 SOUTHWESTERN BELL 520      
636-735 A Chesterfield MCA3 MO 9533 SOUTHWESTERN BELL 520      
636-736 A Chesterfield MCA3 MO 9533 SOUTHWESTERN BELL 520      
636-737 A Chesterfield MCA3 MO 9533 SOUTHWESTERN BELL 520      

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

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