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: 313

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
320-313 A Granite Falls MN STCDMNTOX3X  184D ONVOY, LLC - MN 626      
320-313 0 Granite Falls MN   184D ONVOY, LLC - MN 626      
320-313 1 Granite Falls MN   184D ONVOY, LLC - MN 626      
320-313 2 Granite Falls MN   980E BANDWIDTH.COM CLEC, LLC - MN 626   2015-06-15   
320-313 3 Granite Falls MN   184D ONVOY, LLC - MN 626      
320-313 4 Granite Falls MN   184D ONVOY, LLC - MN 626      
320-313 5 Granite Falls MN   184D ONVOY, LLC - MN 626   2019-05-17   
320-313 6 Granite Falls MN   184D ONVOY, LLC - MN 626      
320-313 7 Granite Falls MN   184D ONVOY, LLC - MN 626   2022-08-13   
320-313 8 Granite Falls MN   184D ONVOY, LLC - MN 626   2019-02-25   
320-313 9 Granite Falls MN   184D ONVOY, LLC - MN 626   2019-02-25   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.