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

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
248-336 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-398 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-399 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-414 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-541 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-542 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-543 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-544 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-545 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-546 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-547 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-548 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-582 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-584 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-586 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-591 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-691 A Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
313-564 A Detroit Zone 3 MI 9323 MICHIGAN BELL TEL CO 340      

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

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