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.
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NPA: 520 [Rate centres in NPA 520] [Dial plan for NPA 520]

NXX: 676

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
520-676 A Willcox AZ TCSNAZXGAMD  6572 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 668   2025-07-21   
520-676 5 Willcox AZ TCSMAZCH1MD  6010 NEW CINGULAR WIRELESS PCS, LLC 668   2026-01-09   
520-676 6 Willcox AZ   145J TERRA NOVA TELECOM INC. 668   2025-07-22   

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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