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: 397

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
320-397 A Montevideo MN   5816 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN 626      
320-397 2 Montevideo MN STCDMNTOXNX  624H ONVOY SPECTRUM, LLC 626   2024-12-19   
320-397 8 Montevideo MN STCDMNTOX7Y  5816 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN 626   2024-10-30   

Last updated: Wed, 04 Mar 2026 03:00:52 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.