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: 566

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
660-566 A Clearmont MO KSCYMO55X0Z  965H FRACTEL, LLC 524      
660-566 5 Clearmont MO   145J TERRA NOVA TELECOM INC. 524   2025-07-24   
660-566 6 Clearmont MO   965H FRACTEL, LLC 524   2020-10-30   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.