Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 301 [Rate centres in NPA 301] [Dial plan for NPA 301]

NXX: 389

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
301-389 A Washington Zone 13 MD LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-389 0 Washington Zone 13 MD LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-389 1 Washington Zone 13 MD LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-389 2 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-08-21   
301-389 3 Washington Zone 13 MD   829J PAETEC ITEL, LLC 236   2006-06-23   
301-389 4 Washington Zone 13 MD LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-389 5 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-04-06   
301-389 6 Washington Zone 13 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-04-06   
301-389 7 Washington Zone 13 MD LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-389 8 Washington Zone 13 MD LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      
301-389 9 Washington Zone 13 MD LARLMDCC5MD  7591 LEVEL 3 TELECOM OF MARYLAND, LLC - MD 236      

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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