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.

Clarkfield, MN

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
320-381 A STCDMNTOX3X  184D ONVOY, LLC - MN 626      
320-381 0 STCDMNTOX3X  184D ONVOY, LLC - MN 626   2019-02-25   
320-381 1 STCDMNTOX3X  184D ONVOY, LLC - MN 626   2017-12-24   
320-381 2 STCDMNTOX3X  184D ONVOY, LLC - MN 626   2021-03-11   
320-381 8 STCDMNTOX3X  184D ONVOY, LLC - MN 626   2019-02-25   
320-381 9 STCDMNTOXTX  073H TELNYX LLC 626   2020-07-12   
320-669 A CLFDMNXCRS0  1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 626      
320-669 0 CLFDMNXCRS0  1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 626      
320-669 1 CLFDMNXCRS0  1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 626      
320-669 2 STCDMNTOX3X  184D ONVOY, LLC - MN 626   2016-05-05   
320-669 3 CLFDMNXCRS0  1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 626      
320-669 4 CLFDMNXCRS0  1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 626      
320-669 5 STCDMNTOX3X  184D ONVOY, LLC - MN 626   2012-08-24   
320-669 6 CLFDMNXCRS0  1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 626      
320-669 7 CLFDMNXCRS0  1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 626      
320-669 8 CLFDMNXCRS0  1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 626      
320-669 9 CLFDMNXCRS0  1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 626      

Last updated: Tue, 07 Oct 2025 16:47:53 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.