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.

Argyle, MN

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
218-437 A ARGYMNXBRS0  1123 CITIZENS TELECOM CO MN-FRONTIER CITIZENS COM-MN 636      
218-438 A ARGYMN02RS0  914F WIKSTROM TELEPHONE COMPANY, INC. - MN 636      
218-438 0   184D ONVOY, LLC - MN 636   2017-05-29   
218-438 1   073H TELNYX LLC 636   2020-06-29   
218-438 2   914F WIKSTROM TELEPHONE COMPANY, INC. - MN 636      
218-438 3   184D ONVOY, LLC - MN 636   2020-03-06   
218-438 4   184D ONVOY, LLC - MN 636   2019-09-12   
218-438 5   184D ONVOY, LLC - MN 636   2023-08-20   
218-438 6   508J CENTURYLINK COMMUNICATIONS, LLC 636   2017-05-30   
218-438 7   184D ONVOY, LLC - MN 636   2014-11-06   
218-438 8   184D ONVOY, LLC - MN 636   2021-03-11   
218-438 9   624H ONVOY SPECTRUM, LLC 636   2021-07-17   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.