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: 570 [Rate centres in NPA 570] [Dial plan for NPA 570]

NXX: 583

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
570-583 A Portland PA SRBGPASR1MD  8320 SERVICE ELECTRIC TELEPHONE COMPANY, LLC 232      
570-583 0 Portland PA   6921 LIMITLESS MOBILE, LLC 232   2018-01-03   
570-583 2 Portland PA   4007 LEVEL 3 COMMUNICATIONS, LLC - PA 232   2017-06-11   
570-583 3 Portland PA   8320 SERVICE ELECTRIC TELEPHONE COMPANY, LLC 232   2010-03-21   
570-583 5 Portland PA   145J TERRA NOVA TELECOM INC. 232   2025-08-01   
570-583 6 Portland PA   7309 TELEPORT COMMUNICATIONS AMERICA, LLC - PA 232   2016-03-21   
570-583 7 Portland PA   508J CENTURYLINK COMMUNICATIONS, LLC 232   2016-02-05   
570-583 8 Portland PA   547E ONVOY, LLC - PA 232   2019-12-18   
570-583 9 Portland PA   547E ONVOY, LLC - PA 232   2020-10-25   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.