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: DTRTMIBHDS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
313-221 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-221 2 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2005-07-17   
313-224 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-225 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-226 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-227 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-234 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-234 0 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-234 1 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-234 2 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-234 4 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-234 5 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-234 6 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-234 7 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-234 8 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-234 9 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-235 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-237 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-256 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-256 0 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-256 2 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-256 3 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-256 4 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-256 5 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-256 6 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-256 7 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-256 8 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-256 9 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-335 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-335 0 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-338 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-338 0 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2011-11-10   
313-338 1 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2011-11-10   
313-338 2 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2011-11-10   
313-373 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-373 0 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2009-10-26   
313-373 1 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2009-10-26   
313-373 2 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2009-10-26   
313-373 3 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2009-10-26   
313-373 4 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2009-10-26   
313-373 5 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2009-10-26   
313-373 6 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2009-10-26   
313-373 7 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2009-10-26   
313-373 8 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2009-10-26   
313-373 9 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2009-10-26   
313-426 5 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2017-07-09   
313-426 6 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2017-07-09   
313-442 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-442 0 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-442 1 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-442 4 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-442 5 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-442 8 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-442 9 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-471 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-471 2 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-471 3 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-471 5 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-471 6 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-471 7 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-545 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-545 0 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2013-11-23   
313-545 1 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2013-11-23   
313-545 2 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2013-11-23   
313-545 3 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2013-11-23   
313-545 4 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2013-11-23   
313-545 5 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2013-11-23   
313-545 6 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2013-11-23   
313-545 7 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2013-11-23   
313-545 8 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2013-11-23   
313-545 9 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2013-11-23   
313-596 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-628 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-760 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-782 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-782 0 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2012-07-22   
313-782 7 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2012-07-22   
313-782 8 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2012-07-22   
313-782 9 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340   2012-07-22   
313-877 1 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-877 2 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-961 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-963 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-964 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-965 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-967 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-983 A Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-983 0 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-983 1 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-983 2 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-983 3 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-983 4 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-983 5 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-983 6 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-983 7 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      
313-983 8 Detroit Zone 1 MI 9323 MICHIGAN BELL TEL CO 340      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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