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.

Darlington, MO

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
660-666 A BTHNMOXADS0  1888 GRAND RIVER MUTUAL TEL CO 524      

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.