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: 740 [Rate centres in NPA 740] [Dial plan for NPA 740]

NXX: 308

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
740-308 A Dexter City OH CLMDOHZI6MD  4863 LEVEL 3 COMMUNICATIONS, LLC - OH 324      
740-308 0 Dexter City OH   4863 LEVEL 3 COMMUNICATIONS, LLC - OH 324      
740-308 1 Dexter City OH   793K TWC IP ENABLED SERVICES, LLC 324   2022-05-29   
740-308 3 Dexter City OH   464C ONVOY, LLC - OH 324   2018-09-20   
740-308 5 Dexter City OH   464C ONVOY, LLC - OH 324   2021-02-01   
740-308 6 Dexter City OH   464C ONVOY, LLC - OH 324   2021-02-01   
740-308 7 Dexter City OH   464C ONVOY, LLC - OH 324   2021-02-01   
740-308 8 Dexter City OH   225H CEBRIDGE TELECOM OH, LLC DBA SUDDENLINK COMM 324   2022-10-19   
740-308 9 Dexter City OH   001F BANDWIDTH.COM CLEC, LLC - OH 324   2009-01-05   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.