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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Richmond, MN

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
320-206 A CLSPMNAL0MD  429A MIDCONTINENT COMMUNICATIONS - MN 626      
320-206 0 CLSPMNAL0MD  429A MIDCONTINENT COMMUNICATIONS - MN 626   2011-11-26   
320-206 7   5256 LEVEL 3 COMMUNICATIONS, LLC - MN 626   2025-02-16   
320-353 A CLSPMNAL0MD  429A MIDCONTINENT COMMUNICATIONS - MN 626      
320-597 A RCMDMNXRRS7  1430 MELROSE TEL. CO. 626      

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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