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: 314 [Rate centres in NPA 314] [Dial plan for NPA 314]

NXX: 228

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
314-228 A Creve Coeur MO STLSMOWQDS2  093F ONVOY, LLC - MO 520      
314-228 0 Creve Coeur MO   093F ONVOY, LLC - MO 520   2004-07-26   
314-228 1 Creve Coeur MO   093F ONVOY, LLC - MO 520   2004-07-26   
314-228 2 Creve Coeur MO   093F ONVOY, LLC - MO 520   2004-07-26   
314-228 3 Creve Coeur MO   093F ONVOY, LLC - MO 520   2004-07-26   
314-228 4 Creve Coeur MO   093F ONVOY, LLC - MO 520   2004-07-26   
314-228 5 Creve Coeur MO   093F ONVOY, LLC - MO 520   2004-07-26   
314-228 6 Creve Coeur MO   093F ONVOY, LLC - MO 520   2004-07-26   
314-228 7 Creve Coeur MO   093F ONVOY, LLC - MO 520   2004-07-26   
314-228 8 Creve Coeur MO   093F ONVOY, LLC - MO 520   2004-07-26   
314-228 9 Creve Coeur MO   093F ONVOY, LLC - MO 520   2004-07-26   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.