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: 713 [Rate centres in NPA 713] [Dial plan for NPA 713]

Region: TX

OCN: 7421 AT&T - LOCAL

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
713-577 A Houston TX HSTNTX01DS2  560      
713-577 0 Houston TX   560      
713-577 1 Houston TX   560      
713-577 2 Houston TX   560      
713-577 3 Houston TX   560      
713-577 4 Houston TX   560      
713-577 5 Houston TX   560      
713-577 6 Houston TX   560      
713-577 7 Houston TX   560      
713-577 8 Houston TX   560      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.