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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OCN: 1636 UNITED TEL. MUTUAL AID CORP.

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
701-256 A Langdon ND LNGDNDXADS2  636      
701-256 1 Langdon ND LNGDNDXADS2  636      
701-256 2 Langdon ND LNGDNDXADS2  636      
701-256 3 Langdon ND LNGDNDXADS2  636      
701-256 4 Langdon ND LNGDNDXADS2  636      
701-256 5 Langdon ND LNGDNDXADS2  636      
701-256 6 Langdon ND LNGDNDXADS2  636      
701-256 7 Langdon ND LNGDNDXADS2  636      
701-256 8 Langdon ND LNGDNDXADS2  636      
701-256 9 Langdon ND LNGDNDXADS2  636      
701-266 A Rock Lake ND LNGDNDXADS2  636      
701-283 A Wales ND LNGDNDXADS2  636      
701-496 A Milton ND LNGDNDXADS2  636      
701-549 A Walhalla ND LNGDNDXADS2  636      
701-682 A Munich ND LNGDNDXADS2  636      
701-697 A Sarles ND LNGDNDXADS2  636      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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