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: DTRTMIRVDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
313-259 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-392 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-393 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-394 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-396 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-446 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-448 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-553 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-566 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-567 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-568 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-656 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-665 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-667 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-877 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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