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: WNDMMNWI83G

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
507-831 A Windom MN 9631 QWEST CORPORATION 620      
507-831 0 Windom MN 9631 QWEST CORPORATION 620      
507-831 1 Windom MN 9631 QWEST CORPORATION 620      
507-831 2 Windom MN 9631 QWEST CORPORATION 620      
507-831 3 Windom MN 9631 QWEST CORPORATION 620      
507-831 4 Windom MN 9631 QWEST CORPORATION 620      
507-831 5 Windom MN 9631 QWEST CORPORATION 620      
507-831 6 Windom MN 9631 QWEST CORPORATION 620      
507-831 8 Windom MN 9631 QWEST CORPORATION 620      
507-831 9 Windom MN 9631 QWEST CORPORATION 620      

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

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