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: 301 [Rate centres in NPA 301] [Dial plan for NPA 301]

NXX: 301

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
301-301 A Gaithersburg MD VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-301 0 Gaithersburg MD VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-301 1 Gaithersburg MD VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-301 2 Gaithersburg MD VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-301 3 Gaithersburg MD VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-301 4 Gaithersburg MD VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-301 5 Gaithersburg MD VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-301 6 Gaithersburg MD VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-301 7 Gaithersburg MD VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-301 8 Gaithersburg MD VINNVACBDS0  876D ONVOY, LLC - MD 236      
301-301 9 Gaithersburg MD VINNVACBDS0  876D ONVOY, LLC - MD 236      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.