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      
937-312 0 Dayton OH 9321 OHIO BELL TEL CO 328      
937-312 1 Dayton OH 9321 OHIO BELL TEL CO 328      
937-312 2 Dayton OH 9321 OHIO BELL TEL CO 328      
937-312 3 Dayton OH 9321 OHIO BELL TEL CO 328      
937-312 6 Dayton OH 9321 OHIO BELL TEL CO 328      
937-312 8 Dayton OH 9321 OHIO BELL TEL CO 328      
937-312 9 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      
937-432 0 Dayton OH 9321 OHIO BELL TEL CO 328      
937-432 1 Dayton OH 9321 OHIO BELL TEL CO 328      
937-432 2 Dayton OH 9321 OHIO BELL TEL CO 328      
937-432 3 Dayton OH 9321 OHIO BELL TEL CO 328      
937-432 4 Dayton OH 9321 OHIO BELL TEL CO 328      
937-432 6 Dayton OH 9321 OHIO BELL TEL CO 328      
937-432 9 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: Wed, 04 Mar 2026 03:00:52 UTC

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