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: 603 [Rate centres in NPA 603] [Dial plan for NPA 603]

NXX: 685

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
603-685 A Salem NH   829J PAETEC ITEL, LLC 122   2025-04-30   
603-685 0 Salem NH   829J PAETEC ITEL, LLC 122   2003-03-13   
603-685 1 Salem NH DOVRNHTHGMD  624H ONVOY SPECTRUM, LLC 122   2020-07-03   
603-685 2 Salem NH   829J PAETEC ITEL, LLC 122   2002-08-21   
603-685 3 Salem NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2005-04-03   
603-685 4 Salem NH MNCHNHCOX8Z  4017 LEVEL 3 COMMUNICATIONS, LLC - NH 122   2005-04-03   
603-685 5 Salem NH DOVRNHTHGMD  624H ONVOY SPECTRUM, LLC 122   2020-07-03   
603-685 6 Salem NH   829J PAETEC ITEL, LLC 122      
603-685 7 Salem NH DOVRNHTHGMD  624H ONVOY SPECTRUM, LLC 122   2020-07-03   
603-685 8 Salem NH MNCHNHIE6MD  318J COMCAST IP PHONE, LLC 122   2019-03-20   
603-685 9 Salem NH DOVRNHTHGMD  624H ONVOY SPECTRUM, LLC 122   2022-01-07   

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.