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: 874

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
636-874 A O'Fallon MO STLSMOGZHMD  516J TON80 COMMUNICATIONS, LLC 520      
636-874 2 O'Fallon MO STLSMOGZHMD  516J TON80 COMMUNICATIONS, LLC 520   2022-04-18   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.