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: 612 [Rate centres in NPA 612] [Dial plan for NPA 612]

NXX: 583

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
612-583 A Twin Cities MN   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 628   2025-08-16   
612-583 5 Twin Cities MN   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 628   2025-08-16   
612-583 6 Twin Cities MN   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 628   2025-08-16   
612-583 7 Twin Cities MN   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 628   2025-08-16   
612-583 8 Twin Cities MN   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 628   2025-08-16   
612-583 9 Twin Cities MN   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 628   2025-08-16   

Last updated: Tue, 15 Jul 2025 18:46:49 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.