Local Calling Guide

Area code/prefix search

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Chester, SD

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
605-489 A BKNGSDXBDS0  1651 INTERSTATE TELECOM COOP, INC. - SD 640      

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

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