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.
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Switch: HNKRNHXARP0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
603-428 A Henniker NH 3320 MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 122      
603-428 0 Henniker NH 3320 MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 122      
603-428 2 Henniker NH 3320 MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 122      
603-428 3 Henniker NH 3320 MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 122      
603-428 6 Henniker NH 3320 MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 122      
603-428 7 Henniker NH 3320 MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 122      
603-428 8 Henniker NH 3320 MERRIMACK CO. TELEPHONE CO., DBA CONTOOCOOK VALLEY 122      

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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