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: 312

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
605-312 A Sioux Falls SD SXFLSDCODS2  9631 QWEST CORPORATION 640      
605-312 0 Sioux Falls SD   9631 QWEST CORPORATION 640      
605-312 1 Sioux Falls SD   9631 QWEST CORPORATION 640      
605-312 2 Sioux Falls SD   9631 QWEST CORPORATION 640      
605-312 3 Sioux Falls SD   9631 QWEST CORPORATION 640      
605-312 4 Sioux Falls SD   9631 QWEST CORPORATION 640      
605-312 5 Sioux Falls SD   9631 QWEST CORPORATION 640      
605-312 6 Sioux Falls SD   9631 QWEST CORPORATION 640      
605-312 7 Sioux Falls SD   9631 QWEST CORPORATION 640      
605-312 8 Sioux Falls SD   9631 QWEST CORPORATION 640      
605-312 9 Sioux Falls SD   9631 QWEST CORPORATION 640      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.