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: DYTNOH27DS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
937-274 A Dayton OH 9321 OHIO BELL TEL CO 328      
937-275 A Dayton OH 9321 OHIO BELL TEL CO 328      
937-276 A Dayton OH 9321 OHIO BELL TEL CO 328      
937-277 A Dayton OH 9321 OHIO BELL TEL CO 328      
937-278 A Dayton OH 9321 OHIO BELL TEL CO 328      
937-279 A Dayton OH 9321 OHIO BELL TEL CO 328      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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