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.

Switch: SXFLSDPS4MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
605-303 7 Watertown SD 197D VONAGE AMERICA LLC 640   2022-07-18   
605-606 2 Sioux Falls SD 197D VONAGE AMERICA LLC 640   2021-08-30   
605-606 8 Sioux Falls SD 197D VONAGE AMERICA LLC 640   2021-08-30   
605-961 A Sioux Falls SD 197D VONAGE AMERICA LLC 640      
605-961 0 Sioux Falls SD 197D VONAGE AMERICA LLC 640   2018-08-12   
605-982 4 Aberdeen SD 197D VONAGE AMERICA LLC 640   2022-07-18   

Last updated: Sat, 15 Nov 2025 03:38:44 UTC

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