Local Calling Guide

Area code/prefix search

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NPA: 447 [Rate centres in NPA 447] [Dial plan for NPA 447]

NXX: 283

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
447-283 A Springfield IL SPFDILGI4MD  475J CALLWORKS CORPORATION 374   2024-02-08   
447-283 1 Springfield IL SPFDILGI4MD  475J CALLWORKS CORPORATION 374   2024-02-08   

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

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