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: CNTMOH43DS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
937-291 A Dayton OH 9321 OHIO BELL TEL CO 328      
937-312 A Dayton OH 9321 OHIO BELL TEL CO 328      
937-428 A Dayton OH 9321 OHIO BELL TEL CO 328      
937-432 A Dayton OH 9321 OHIO BELL TEL CO 328      
937-433 A Dayton OH 9321 OHIO BELL TEL CO 328      
937-434 A Dayton OH 9321 OHIO BELL TEL CO 328      
937-435 A Dayton OH 9321 OHIO BELL TEL CO 328      
937-436 A Dayton OH 9321 OHIO BELL TEL CO 328      
937-438 A Dayton OH 9321 OHIO BELL TEL CO 328      
937-439 A Dayton OH 9321 OHIO BELL TEL CO 328      

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

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