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.

OCN: 820C INTRADO COMMUNICATIONS, LLC

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
443-961 A Baltimore MD BLTMMDCHPMD  238      
443-961 0 Baltimore MD BLTMMDCHPMD  238   2015-02-13   
443-961 9 Baltimore MD BLTMMDCHPMD  238   2015-02-13   
667-547 4 Baltimore MD   238   2026-09-13   
667-560 0 Baltimore MD   238   2026-10-05   
667-560 1 Baltimore MD   238   2026-10-05   
667-771 0 Baltimore MD BLTMMDCHPMD  238   2016-08-20   

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.