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.
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Switch: SFLDMIOKDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
248-331 A Southfield MI 9323 MICHIGAN BELL TEL CO 340      
248-395 A Southfield MI 9323 MICHIGAN BELL TEL CO 340      
248-423 A Southfield MI 9323 MICHIGAN BELL TEL CO 340      
248-424 A Southfield MI 9323 MICHIGAN BELL TEL CO 340      
248-443 A Southfield MI 9323 MICHIGAN BELL TEL CO 340      
248-483 A Southfield MI 9323 MICHIGAN BELL TEL CO 340      
248-552 A Southfield MI 9323 MICHIGAN BELL TEL CO 340      
248-557 A Southfield MI 9323 MICHIGAN BELL TEL CO 340      
248-559 A Southfield MI 9323 MICHIGAN BELL TEL CO 340      
248-569 A Southfield MI 9323 MICHIGAN BELL TEL CO 340      
248-849 A Southfield MI 9323 MICHIGAN BELL TEL CO 340      
248-905 A Southfield MI 9323 MICHIGAN BELL TEL CO 340      
248-967 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-968 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
313-249 A Detroit Zone 5 MI 9323 MICHIGAN BELL TEL CO 340      
313-275 A Detroit Zone 5 MI 9323 MICHIGAN BELL TEL CO 340      
313-302 A Detroit Zone 5 MI 9323 MICHIGAN BELL TEL CO 340      
313-560 A Detroit Zone 5 MI 9323 MICHIGAN BELL TEL CO 340      
313-599 A Detroit Zone 5 MI 9323 MICHIGAN BELL TEL CO 340      
313-602 A Detroit Zone 5 MI 9323 MICHIGAN BELL TEL CO 340      
313-780 A Detroit Zone 5 MI 9323 MICHIGAN BELL TEL CO 340      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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