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: RYLOMIMNDS0

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
248-691 0 Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-691 1 Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-691 2 Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-691 3 Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-691 4 Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-691 6 Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-691 7 Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-691 8 Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-691 9 Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
313-564 A Detroit Zone 3 MI 9323 MICHIGAN BELL TEL CO 340      
313-564 2 Detroit Zone 3 MI 9323 MICHIGAN BELL TEL CO 340      
313-564 3 Detroit Zone 3 MI 9323 MICHIGAN BELL TEL CO 340      
313-564 4 Detroit Zone 3 MI 9323 MICHIGAN BELL TEL CO 340      

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Last updated: Thu, 05 Feb 2026 23:41:55 UTC

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