Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Washington Zone 13 (Baltimore LATA), MD

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
301-307 9   876D ONVOY, LLC - MD 238   2020-11-07   

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Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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