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: TROYMIMNRPA

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
248-733 6 Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-733 7 Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-733 8 Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-733 9 Royal Oak MI 9323 MICHIGAN BELL TEL CO 340      
248-740 A Troy MI 9323 MICHIGAN BELL TEL CO 340      
248-743 A Troy MI 9323 MICHIGAN BELL TEL CO 340      
248-743 0 Troy MI 9323 MICHIGAN BELL TEL CO 340      
248-743 1 Troy MI 9323 MICHIGAN BELL TEL CO 340      
248-743 2 Troy MI 9323 MICHIGAN BELL TEL CO 340      
248-743 3 Troy MI 9323 MICHIGAN BELL TEL CO 340      
248-743 4 Troy MI 9323 MICHIGAN BELL TEL CO 340      
248-743 5 Troy MI 9323 MICHIGAN BELL TEL CO 340      
248-743 6 Troy MI 9323 MICHIGAN BELL TEL CO 340      
248-743 8 Troy MI 9323 MICHIGAN BELL TEL CO 340      
248-743 9 Troy MI 9323 MICHIGAN BELL TEL CO 340      

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Last updated: Wed, 04 Mar 2026 03:00:52 UTC

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