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.

Switch: MDSTCA52RS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
209-558 A Modesto CA 9740 PACIFIC BELL 738      
209-558 0 Modesto CA 9740 PACIFIC BELL 738      
209-558 1 Modesto CA 9740 PACIFIC BELL 738      
209-558 2 Modesto CA 9740 PACIFIC BELL 738      
209-558 3 Modesto CA 9740 PACIFIC BELL 738      
209-558 4 Modesto CA 9740 PACIFIC BELL 738      
209-558 5 Modesto CA 9740 PACIFIC BELL 738      
209-558 6 Modesto CA 9740 PACIFIC BELL 738      
209-558 7 Modesto CA 9740 PACIFIC BELL 738      
209-558 8 Modesto CA 9740 PACIFIC BELL 738      
209-558 9 Modesto CA 9740 PACIFIC BELL 738      

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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