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: DTRTMILXDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
313-331 A Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-331 0 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-331 1 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-331 2 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-331 3 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-331 4 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-331 7 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-331 8 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-499 A Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-499 2 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-499 4 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-821 A Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-821 0 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-821 1 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-821 2 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-821 3 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-821 5 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-821 8 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-821 9 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-822 A Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-823 A Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-823 0 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-823 1 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-823 4 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-823 6 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-823 7 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-823 8 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-823 9 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-824 A Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-824 0 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-824 2 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-824 4 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-824 5 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-824 6 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-824 9 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-926 A Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-926 4 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-926 5 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      
313-926 8 Detroit Zone 2 MI 9323 MICHIGAN BELL TEL CO 340      

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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