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: 628 [Rate centres in NPA 628] [Dial plan for NPA 628]

NXX: 302

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
628-302 A Corte Madera CA OKLECAZV1MD  6529 T-MOBILE USA, INC. 722   2024-05-10   
628-302 0 Corte Madera CA   624H ONVOY SPECTRUM, LLC 722   2024-08-18   
628-302 5 Corte Madera CA   373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 722   2024-11-19   
628-302 7 Corte Madera CA   6529 T-MOBILE USA, INC. 722   2024-09-15   
628-302 8 Corte Madera CA   197D VONAGE AMERICA LLC 722   2024-07-18   
628-302 9 Corte Madera CA   6529 T-MOBILE USA, INC. 722   2024-05-10   

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.