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: 605 [Rate centres in NPA 605] [Dial plan for NPA 605]

NXX: 640

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
605-640 A McIntosh SD SXFLSDPSDS1  580H AIRUS, INC. - SD 640      
605-640 0 McIntosh SD SXFLSDCOTMD  162G ONVOY, LLC - SD 640   2021-07-08   
605-640 1 McIntosh SD SXFLSDPSDS1  580H AIRUS, INC. - SD 640   2019-12-02   
605-640 2 McIntosh SD SXFLSDCOTMD  162G ONVOY, LLC - SD 640   2021-02-12   
605-640 3 McIntosh SD SXFLSDCOTMD  162G ONVOY, LLC - SD 640   2021-02-12   
605-640 4 McIntosh SD SXFLSDCOTMD  162G ONVOY, LLC - SD 640   2020-10-23   
605-640 5 McIntosh SD SXFLSDCOTMD  162G ONVOY, LLC - SD 640   2020-08-21   
605-640 6 McIntosh SD SXFLSDCOTMD  162G ONVOY, LLC - SD 640   2020-08-21   
605-640 7 McIntosh SD SXFLSDCORMD  5180 LEVEL 3 COMMUNICATIONS, LLC - SD 640   2023-01-07   
605-640 8 McIntosh SD SXFLSDCOX0X  624H ONVOY SPECTRUM, LLC 640   2024-12-20   
605-640 9 McIntosh SD SXFLSDPS0MD  073H TELNYX LLC 640   2019-12-03   

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.