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: DTRTMIHGDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
313-491 A Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-491 0 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-491 1 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-491 2 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-491 3 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-491 4 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-491 5 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-491 6 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-491 7 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-491 8 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-834 A Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-931 A Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-933 A Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-934 A Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-934 0 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-934 1 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-934 2 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-934 3 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-934 4 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-934 5 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-934 7 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-934 8 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-934 9 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-935 A Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-935 0 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-935 1 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-935 2 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-935 3 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-935 4 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-935 5 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-935 7 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-935 8 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-935 9 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      

Last updated: Tue, 15 Jul 2025 18:46:49 UTC

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