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.

NPA: 313 [Rate centres in NPA 313] [Dial plan for NPA 313]

NXX:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
313-373 A Detroit Zone 1 MI DTRTMIBHDS1  9323 AMERITECH MICHIGAN 340   2009-10-26   
313-373 0 Detroit Zone 1 MI   9323 AMERITECH MICHIGAN 340   2009-10-26   
313-373 1 Detroit Zone 1 MI   9323 AMERITECH MICHIGAN 340   2009-10-26   
313-373 2 Detroit Zone 1 MI   9323 AMERITECH MICHIGAN 340   2009-10-26   
313-373 3 Detroit Zone 1 MI   9323 AMERITECH MICHIGAN 340   2009-10-26   
313-373 4 Detroit Zone 1 MI   9323 AMERITECH MICHIGAN 340   2009-10-26   
313-373 5 Detroit Zone 1 MI   9323 AMERITECH MICHIGAN 340   2009-10-26   
313-373 6 Detroit Zone 1 MI   9323 AMERITECH MICHIGAN 340   2009-10-26   
313-373 7 Detroit Zone 1 MI   9323 AMERITECH MICHIGAN 340   2009-10-26   
313-373 8 Detroit Zone 1 MI   9323 AMERITECH MICHIGAN 340   2009-10-26   
313-373 9 Detroit Zone 1 MI   9323 AMERITECH MICHIGAN 340   2009-10-26   

Last updated: Tue, 31 Dec 2019 02:37:20 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.