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.
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Switch: COLOIAXORS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
641-377 A Colo IA 1134 COLO TEL. CO. 632      
641-377 0 Colo IA 1134 COLO TEL. CO. 632      
641-377 1 Colo IA 1134 COLO TEL. CO. 632      
641-377 2 Colo IA 1134 COLO TEL. CO. 632      
641-377 3 Colo IA 1134 COLO TEL. CO. 632      
641-377 4 Colo IA 1134 COLO TEL. CO. 632      
641-377 5 Colo IA 1134 COLO TEL. CO. 632      
641-377 7 Colo IA 1134 COLO TEL. CO. 632      
641-377 8 Colo IA 1134 COLO TEL. CO. 632      
641-377 9 Colo IA 1134 COLO TEL. CO. 632      

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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