Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 636 [Rate centres in NPA 636] [Dial plan for NPA 636]

NXX: 665

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
636-665 A Old Monroe MO OLMRMOXARS1  9787 BRIGHTSPEED OF MISSOURI, LLC 520      
636-665 0 Old Monroe MO   073H TELNYX LLC 520   2020-08-07   
636-665 5 Old Monroe MO   9787 BRIGHTSPEED OF MISSOURI, LLC 520      
636-665 6 Old Monroe MO   145J TERRA NOVA TELECOM INC. 520   2026-01-04   

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

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