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: 750

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
520-750 A Tucson AZ TCSNAZCRDS0  9636 QWEST CORPORATION 668      
520-750 0 Tucson AZ TCSNAZCRDS0  9636 QWEST CORPORATION 668      
520-750 1 Tucson AZ TCSNAZCRDS0  9636 QWEST CORPORATION 668      
520-750 2 Tucson AZ TCSNAZCRDS0  9636 QWEST CORPORATION 668      
520-750 3 Tucson AZ TCSMAZCHCMD  145J TERRA NOVA TELECOM INC. 668   2022-10-18   
520-750 4 Tucson AZ TCSNAZCRDS0  9636 QWEST CORPORATION 668      
520-750 5 Tucson AZ MARNAZMARS1  9636 QWEST CORPORATION 668      
520-750 6 Tucson AZ TCSNAZCRDS0  9636 QWEST CORPORATION 668      
520-750 7 Tucson AZ TCSNAZCRDS0  9636 QWEST CORPORATION 668      
520-750 8 Tucson AZ TCSNAZCRDS0  9636 QWEST CORPORATION 668      
520-750 9 Tucson AZ TCSNAZCRDS0  9636 QWEST CORPORATION 668      

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

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