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: 220 [Rate centres in NPA 220] [Dial plan for NPA 220]

NXX: 740

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
220-740 A Lower Salem OH CMBROHXB4MD  464C ONVOY, LLC - OH 324      
220-740 0 Lower Salem OH   464C ONVOY, LLC - OH 324   2023-01-05   
220-740 1 Lower Salem OH   624H ONVOY SPECTRUM, LLC 324   2024-10-27   
220-740 7 Lower Salem OH   464C ONVOY, LLC - OH 324   2023-01-05   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.