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: 335

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
361-335 A Port Lavaca TX PTLVTXXAOMD  506J TWILIO INTERNATIONAL, INC. 564   2024-12-27   
361-335 0 Port Lavaca TX PTLVTXXAOMD  506J TWILIO INTERNATIONAL, INC. 564   2024-12-27   
361-335 3 Port Lavaca TX   5562 METROPCS, INC. 564   2026-07-11   

Last updated: Tue, 16 Jun 2026 00:09:45 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.