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.

Alma, MO

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
660-203 A NRBRMO010MD  6155 GREEN HILLS TELECOMMUNICATIONS SERVICES 524   2025-01-24   
660-203 1 NRBRMO010MD  6155 GREEN HILLS TELECOMMUNICATIONS SERVICES 524   2025-01-24   
660-203 2 KSCYMO55X1Z  318J COMCAST IP PHONE, LLC 524   2025-12-26   
660-674 A HNVIMOXADS0  1860 ALMA COMMUNICATIONS COMPANY DBA ALMA TELEPHONE CO 524      

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.