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.

Switch: LNGDNDXADS2

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
701-256 A Langdon ND 1636 UNITED TEL. MUTUAL AID CORP. 636      
701-266 A Rock Lake ND 1636 UNITED TEL. MUTUAL AID CORP. 636      
701-283 A Wales ND 1636 UNITED TEL. MUTUAL AID CORP. 636      
701-496 A Milton ND 1636 UNITED TEL. MUTUAL AID CORP. 636      
701-549 A Walhalla ND 1636 UNITED TEL. MUTUAL AID CORP. 636      
701-682 A Munich ND 1636 UNITED TEL. MUTUAL AID CORP. 636      
701-697 A Sarles ND 1636 UNITED TEL. MUTUAL AID CORP. 636      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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