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: WTTWSDCO0MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
605-405 9 Arlington SD 907D INTERSTATE TELECOMMUNICATIONS COOPERATIVE, INC. 640      
605-438 A Milbank SD 907D INTERSTATE TELECOMMUNICATIONS COOPERATIVE, INC. 640      
605-621 A Madison SD 907D INTERSTATE TELECOMMUNICATIONS COOPERATIVE, INC. 640      
605-621 9 Madison SD 907D INTERSTATE TELECOMMUNICATIONS COOPERATIVE, INC. 640      
605-954 9 Watertown SD 907D INTERSTATE TELECOMMUNICATIONS COOPERATIVE, INC. 640      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

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