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.

NPA: 660 [Rate centres in NPA 660] [Dial plan for NPA 660]

NXX: 635

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
660-635 A Trenton MO INDPMOXCGT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 524      
660-635 0 Trenton MO INDPMOXCGT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 524      
660-635 1 Trenton MO INDPMOXCGT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 524      
660-635 2 Trenton MO INDPMOXCGT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 524   2008-01-17   
660-635 5 Trenton MO KSCYMO03AMD  145J TERRA NOVA TELECOM INC. 524   2024-02-13   
660-635 6 Trenton MO   145J TERRA NOVA TELECOM INC. 524   2025-10-16   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.