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: MTLKMNXMDS1

Remotes:

Switch Switch name Switch type
BTFDMNXBRS0  BUTTERFIELD  1RC 
CMFRMNXCRS0  COMFREY  1RC 
DLFTMNXDRS0  DELFT  1RC 
ODINMNXORS0  ODIN  RLC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
507-427 A Mountain Lake MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 620      
507-427 0 Mountain Lake MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 620      
507-427 1 Mountain Lake MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 620      
507-427 2 Mountain Lake MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 620      
507-427 3 Mountain Lake MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 620      
507-427 4 Mountain Lake MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 620      
507-427 5 Mountain Lake MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 620      
507-427 8 Mountain Lake MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 620      
507-427 9 Mountain Lake MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 620      

Last updated: Wed, 04 Mar 2026 03:00:52 UTC

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