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.

NPA: 641 [Rate centres in NPA 641] [Dial plan for NPA 641]

NXX: 430

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
641-430 A Mason City IA CNVLIABC1MD  6266 UNITED STATES CELLULAR - IA 632      
641-430 0 Mason City IA   6266 UNITED STATES CELLULAR - IA 632      
641-430 1 Mason City IA   6266 UNITED STATES CELLULAR - IA 632      
641-430 2 Mason City IA   6266 UNITED STATES CELLULAR - IA 632      
641-430 3 Mason City IA   6266 UNITED STATES CELLULAR - IA 632      
641-430 4 Mason City IA   6266 UNITED STATES CELLULAR - IA 632      
641-430 5 Mason City IA   6266 UNITED STATES CELLULAR - IA 632      
641-430 6 Mason City IA   6266 UNITED STATES CELLULAR - IA 632      
641-430 7 Mason City IA   6266 UNITED STATES CELLULAR - IA 632      
641-430 8 Mason City IA   6266 UNITED STATES CELLULAR - IA 632      
641-430 9 Mason City IA   6266 UNITED STATES CELLULAR - IA 632      

Last updated: Sat, 21 Mar 2026 23:53:39 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.