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.

NPA: 320 [Rate centres in NPA 320] [Dial plan for NPA 320]

NXX: 233

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
320-233 A Finlayson MN FNSNMNXFRS0  1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 628      
320-233 0 Finlayson MN FNSNMNXFRS0  1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 628      
320-233 1 Finlayson MN FNSNMNXFRS0  1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 628      
320-233 2 Finlayson MN MPLSMNCDDSC  184D ONVOY, LLC - MN 628   2016-12-16   
320-233 3 Finlayson MN MPLSMNCDDSC  184D ONVOY, LLC - MN 628   2015-06-19   
320-233 4 Finlayson MN MPLSMNCDZMD  073H TELNYX LLC 628   2021-08-04   
320-233 5 Finlayson MN MPLSMNCDDSC  184D ONVOY, LLC - MN 628   2020-08-17   
320-233 6 Finlayson MN FNSNMNXFRS0  1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 628      
320-233 7 Finlayson MN FNSNMNXFRS0  1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 628      
320-233 8 Finlayson MN MPLSMNCDZMD  073H TELNYX LLC 628   2020-07-16   
320-233 9 Finlayson MN MPLSMNCDDSC  184D ONVOY, LLC - MN 628   2020-11-07   

Last updated: Fri, 25 Jul 2025 03:21:23 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.