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: DTRTMIVTDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
313-270 A Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-270 1 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-270 2 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-270 3 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-270 4 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-272 A Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-273 A Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-493 A Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-493 0 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-493 1 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-493 3 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-493 4 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-493 6 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-493 7 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-493 8 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-493 9 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-653 A Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-653 0 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-653 3 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-653 4 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-659 A Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-659 0 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-659 1 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-659 2 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-659 5 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-659 7 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-659 9 Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-835 A Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-836 A Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-837 A Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      
313-838 A Detroit Zone 4 MI 9323 MICHIGAN BELL TEL CO 340      

Last updated: Tue, 01 Sep 2026 00:40:05 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.