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.

OCN: 2338 SIERRA TEL. CO., INC.

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
209-742 A Mariposa CA MRPSCAXFRS0  728      
209-966 A Mariposa CA MRPSCAXFRS0  728      
559-641 A Coarsegold CA OKHRCAXADS0  728      
559-642 A Coarsegold CA OKHRCAXADS0  728      
559-658 A Coarsegold CA OKHRCAXADS0  728      
559-683 A Coarsegold CA OKHRCAXADS0  728      
559-689 A Raymond CA OKHRCAXADS0  728      
559-692 A Coarsegold CA OKHRCAXADS0  728      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.