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: 296

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
660-296 A Clinton MO   093F ONVOY, LLC - MO 524   2026-09-12   
660-296 0 Clinton MO   093F ONVOY, LLC - MO 524   2026-09-12   

Last updated: Tue, 01 Sep 2026 00:40:05 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.