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: 737 [Rate centres in NPA 737] [Dial plan for NPA 737]

NXX: 425

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
737-425 A Georgetown TX   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 558   2025-10-24   
737-425 0 Georgetown TX   903C ONVOY, LLC - TX 558   2025-10-27   
737-425 9 Georgetown TX   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 558   2025-10-24   

Last updated: Tue, 07 Oct 2025 16:47:53 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.