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: CRWLMNXCRS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
218-644 A Cromwell MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 624      
218-644 0 Cromwell MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 624      
218-644 1 Cromwell MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 624      
218-644 3 Cromwell MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 624      
218-644 5 Cromwell MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 624      
218-644 8 Cromwell MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 624      
218-644 9 Cromwell MN 1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 624      

Last updated: Sat, 21 Mar 2026 23:53:39 UTC

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