Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Hammon, OK

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
580-473 A HMMNOKXARS1  1965 WINDSTREAM OKLAHOMA, INC. 536      
580-801 A   624H ONVOY SPECTRUM, LLC 536   2025-03-06   
580-801 0   624H ONVOY SPECTRUM, LLC 536   2025-03-06   

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

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