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: MSCYIATCDS0

Remotes:

Switch Switch name Switch type
ACKLIACORS8  ACKLEY  RSC 
BRTTIACORS8  BRITT  RSC 
CHCYIATCRS2  CHARLES CITY  RSC 
GRNRIACORS9  GARNER  RSC 
HMPNIACORS4  HAMPTON GENEVA  RSC 
LVMRIACORS3  LIVERMORE  RSC 
MNLYIACORS4  MANLY  RSC 
NASHIACORS4  NASHUA  RSC 
NWODIACORS3  NORTHWOOD  RSC 
OSAGIACORS7  OSAGE  RSC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
641-380 A Mason City IA 9631 QWEST CORPORATION 632      
641-421 A Mason City IA 9631 QWEST CORPORATION 632      
641-422 A Mason City IA 9631 QWEST CORPORATION 632      
641-423 A Mason City IA 9631 QWEST CORPORATION 632      
641-424 A Mason City IA 9631 QWEST CORPORATION 632      
641-428 A Mason City IA 9631 QWEST CORPORATION 632      
641-494 A Mason City IA 9631 QWEST CORPORATION 632      

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.