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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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
320-270 9 Holmes City MN 624H ONVOY SPECTRUM, LLC 626   2024-12-19   
507-502 4 North Chester MN 624H ONVOY SPECTRUM, LLC 635   2021-07-17   
563-220 5 Sabula IA 624H ONVOY SPECTRUM, LLC 634   2024-12-19   
563-294 2 West Union IA 624H ONVOY SPECTRUM, LLC 635   2021-07-17   
563-294 3 West Union IA 624H ONVOY SPECTRUM, LLC 635   2021-10-29   
563-356 1 Chester IA 624H ONVOY SPECTRUM, LLC 635   2024-12-19   
563-540 A Waukon IA 624H ONVOY SPECTRUM, LLC 635      
563-540 5 Waukon IA 624H ONVOY SPECTRUM, LLC 635   2021-08-21   
563-550 A Calmar IA 624H ONVOY SPECTRUM, LLC 635      
563-550 5 Calmar IA 624H ONVOY SPECTRUM, LLC 635   2021-08-21   
563-560 A Lansing IA 624H ONVOY SPECTRUM, LLC 635      
563-560 5 Lansing IA 624H ONVOY SPECTRUM, LLC 635   2021-08-21   
563-644 6 Decorah IA 624H ONVOY SPECTRUM, LLC 635   2021-08-03   

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Last updated: Sun, 17 May 2026 03:26:51 UTC

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