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: 636 [Rate centres in NPA 636] [Dial plan for NPA 636]

NXX: 408

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
636-408 A High Ridge MO STLSMOWQDS2  093F ONVOY, LLC - MO 520   2024-05-21   
636-408 0 High Ridge MO STLSMOWQDS2  093F ONVOY, LLC - MO 520   2024-05-21   
636-408 1 High Ridge MO STLSMOWQDS2  093F ONVOY, LLC - MO 520   2024-05-21   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.