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: 434

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
520-434 A Tucson AZ TCSNAZSODS0  9636 QWEST CORPORATION 668      
520-434 0 Tucson AZ   9636 QWEST CORPORATION 668      
520-434 2 Tucson AZ   9636 QWEST CORPORATION 668      
520-434 3 Tucson AZ   9636 QWEST CORPORATION 668      
520-434 4 Tucson AZ   9636 QWEST CORPORATION 668      
520-434 5 Tucson AZ   9636 QWEST CORPORATION 668      
520-434 6 Tucson AZ   9636 QWEST CORPORATION 668      
520-434 7 Tucson AZ   9636 QWEST CORPORATION 668      
520-434 8 Tucson AZ   9636 QWEST CORPORATION 668      
520-434 9 Tucson AZ   9636 QWEST CORPORATION 668      

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

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