Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 816 [Rate centres in NPA 816] [Dial plan for NPA 816]

NXX: 644

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
816-644 A Cosby MO KSCYMO55XXX  093F ONVOY, LLC - MO 524      
816-644 2 Cosby MO   093F ONVOY, LLC - MO 524   2021-03-06   
816-644 4 Cosby MO   4932 LEVEL 3 COMMUNICATIONS, LLC - MO 524   2017-03-20   
816-644 6 Cosby MO   093F ONVOY, LLC - MO 524   2018-11-26   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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