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.

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
248-586 4 Royal Oak MI SFLDMIMKNMD  340   2008-09-21   
248-667 0 South Lyon MI SFLDMIMKNMD  340   2009-05-28   
248-679 0 Northville MI SFLDMIMKNMD  340   2008-11-02   
248-690 0 Lake Orion MI SFLDMIMKNMD  340   2008-06-28   
248-716 2 Commerce MI SFLDMIMKNMD  340   2010-05-22   
248-805 A Rochester MI SFLDMIMKNMD  340      
248-805 0 Rochester MI SFLDMIMKNMD  340   2008-04-01   
248-876 8 Farmington MI SFLDMIMKNMD  340   2009-07-31   
269-282 3 Battle Creek MI BRSPMI09HMD  348   2009-01-02   
269-454 5 Kalamazoo MI   348   2025-10-20   
312-216 A Chicago Zone 01-Calumet IL CHCGILWUX6X  358      
312-216 1 Chicago Zone 01-Calumet IL CHCGILWUX6X  358   2012-04-13   
312-235 4 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2005-11-27   
312-235 5 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2005-11-27   
312-237 4 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2010-06-06   
312-239 2 Chicago Zone 01-Canal IL CHCGILWUX6X  358   2004-03-09   
312-242 2 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2002-07-03   
312-242 4 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2001-07-09   
312-242 6 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2001-07-09   
312-242 8 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2001-07-09   
312-242 9 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2001-07-09   
312-247 A Chicago Zone 01-Calumet IL CHCGILWUX6X  358      
312-247 0 Chicago Zone 01-Calumet IL CHCGILWUX6X  358   2004-05-28   
312-247 1 Chicago Zone 01-Calumet IL CHCGILWUX6X  358   2004-05-28   
312-247 2 Chicago Zone 01-Calumet IL CHCGILWUX6X  358   2004-05-28   
312-247 3 Chicago Zone 01-Calumet IL CHCGILWUX6X  358   2004-05-28   
312-247 4 Chicago Zone 01-Calumet IL CHCGILWUX6X  358   2004-05-28   
312-247 5 Chicago Zone 01-Calumet IL CHCGILWUX6X  358   2004-05-28   
312-247 6 Chicago Zone 01-Calumet IL CHCGILWUX6X  358   2004-05-28   
312-247 7 Chicago Zone 01-Calumet IL CHCGILWUX6X  358   2004-05-28   
312-247 8 Chicago Zone 01-Calumet IL CHCGILWUX6X  358   2004-05-28   
312-247 9 Chicago Zone 01-Calumet IL CHCGILWUX6X  358   2004-05-28   
312-256 8 Chicago Zone 01-Calumet IL CHCGILWUX6X  358   2009-01-31   
312-261 3 Chicago Zone 01-Calumet IL CHCGILWUX6X  358      
312-267 4 Chicago Zone 01-Franklin IL CHCGILWUX6X  358   2004-09-24   
312-291 2 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2010-03-01   
312-291 7 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2006-05-25   
312-319 7 Chicago Zone 01-Calumet IL CHCGILWUX6X  358   2017-06-20   
312-334 A Chicago Zone 01-Calumet IL CHCGILWUX6X  358      
312-363 6 Chicago Zone 01-Monroe IL CHCGILWUX6X  358   2004-06-06   
312-374 2 Chicago Zone 01-Lakeshore IL CHCGILWUX6X  358   2013-01-04   
312-379 3 Chicago Zone 01-Calumet IL CHCGILWUX6X  358   2005-02-24   
312-386 6 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2011-07-08   
312-386 8 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2005-08-19   
312-444 8 Chicago Zone 01-Franklin IL CHCGILWUX6X  358   2009-01-15   
312-447 2 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2006-07-11   
312-447 3 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2006-07-11   
312-447 5 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2006-07-11   
312-447 6 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2006-07-11   
312-447 7 Chicago Zone 01-Wabash IL CHCGILWUX6X  358   2006-07-11   

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

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