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: 257

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
641-257 A Charles City IA CHCYIATCRS2  9631 QWEST CORPORATION 632      
641-257 0 Charles City IA   9631 QWEST CORPORATION 632      
641-257 1 Charles City IA   9631 QWEST CORPORATION 632      
641-257 2 Charles City IA   9631 QWEST CORPORATION 632      
641-257 3 Charles City IA   9631 QWEST CORPORATION 632      
641-257 4 Charles City IA   9631 QWEST CORPORATION 632      
641-257 5 Charles City IA   9631 QWEST CORPORATION 632      
641-257 6 Charles City IA   9631 QWEST CORPORATION 632      
641-257 7 Charles City IA   6266 UNITED STATES CELLULAR - IA 632   2004-10-02   
641-257 8 Charles City IA   6266 UNITED STATES CELLULAR - IA 632   2003-12-27   
641-257 9 Charles City IA   6266 UNITED STATES CELLULAR - IA 632   2003-12-27   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.