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: 574

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
330-574 A Niles OH YNTWOH02ZMD  7421 AT&T - LOCAL 322      
330-574 0 Niles OH   7421 AT&T - LOCAL 322      
330-574 1 Niles OH   001F BANDWIDTH.COM CLEC, LLC - OH 322   2014-11-09   
330-574 2 Niles OH   001F BANDWIDTH.COM CLEC, LLC - OH 322   2015-05-29   
330-574 3 Niles OH   001F BANDWIDTH.COM CLEC, LLC - OH 322   2016-07-11   
330-574 4 Niles OH   464C ONVOY, LLC - OH 322   2017-04-27   
330-574 5 Niles OH   793K TWC IP ENABLED SERVICES, LLC 322   2018-04-16   
330-574 6 Niles OH   464C ONVOY, LLC - OH 322   2019-08-09   
330-574 7 Niles OH   464C ONVOY, LLC - OH 322   2019-08-09   
330-574 8 Niles OH   464C ONVOY, LLC - OH 322   2020-06-20   
330-574 9 Niles OH   464C ONVOY, LLC - OH 322   2020-06-20   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.