Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 557 [Rate centres in NPA 557] [Dial plan for NPA 557]

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
557-999 8 Sappington MO STLSMOGZDS5  225F PEERLESS NETWORK OF MISSOURI, LLC - MO 520   2023-02-27   
557-999 9 Sappington MO   145J TERRA NOVA TELECOM INC. 520   2022-11-18   

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Last updated: Thu, 05 Feb 2026 23:41:55 UTC

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