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: 361 [Rate centres in NPA 361] [Dial plan for NPA 361]

NXX: 303

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
361-303 A Premont TX PTLVTXXAIMD  903C ONVOY, LLC - TX 564      
361-303 0 Premont TX   624H ONVOY SPECTRUM, LLC 564   2024-05-23   
361-303 3 Premont TX   903C ONVOY, LLC - TX 564   2021-09-04   
361-303 9 Premont TX   903C ONVOY, LLC - TX 564   2022-12-15   

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.