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: 330 [Rate centres in NPA 330] [Dial plan for NPA 330]

NXX: 278

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
330-278 A Hinckley OH HNCKOHXARS1  0666 WINDSTREAM WESTERN RESERVE, INC. 320      
330-278 0 Hinckley OH CLEVOHEKDS0  464C ONVOY, LLC - OH 320   2020-01-09   
330-278 1 Hinckley OH NRFDOHXAQMD  793K TWC IP ENABLED SERVICES, LLC 320   2007-06-06   
330-278 2 Hinckley OH HNCKOHXARS1  0666 WINDSTREAM WESTERN RESERVE, INC. 320      
330-278 3 Hinckley OH HNCKOHXARS1  0666 WINDSTREAM WESTERN RESERVE, INC. 320      
330-278 4 Hinckley OH HNCKOHXARS1  0666 WINDSTREAM WESTERN RESERVE, INC. 320      
330-278 5 Hinckley OH CLEVOH62XQZ  508J CENTURYLINK COMMUNICATIONS, LLC 320   2015-08-28   
330-278 6 Hinckley OH CLEVOHIWDS0  7443 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH 320   2013-01-31   
330-278 7 Hinckley OH HNCKOHXARP0  0666 WINDSTREAM WESTERN RESERVE, INC. 320      
330-278 8 Hinckley OH CLEVOHEKDS0  464C ONVOY, LLC - OH 320   2014-05-03   
330-278 9 Hinckley OH HNCKOHXARS1  0666 WINDSTREAM WESTERN RESERVE, INC. 320      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.