Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 301 [Rate centres in NPA 301] [Dial plan for NPA 301]

NXX: 533

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
301-533 A Oakland MD OKLDMDOKDS0  9212 VERIZON MARYLAND, INC. 240      
301-533 0 Oakland MD OKLDMDOKDS0  9212 VERIZON MARYLAND, INC. 240      
301-533 1 Oakland MD OKLDMDOKDS0  9212 VERIZON MARYLAND, INC. 240      
301-533 2 Oakland MD OKLDMDOKDS0  9212 VERIZON MARYLAND, INC. 240      
301-533 3 Oakland MD OKLDMDOKDS0  9212 VERIZON MARYLAND, INC. 240      
301-533 4 Oakland MD OKLDMDOKDS0  9212 VERIZON MARYLAND, INC. 240      
301-533 5 Oakland MD   2593 CORE COMMUNICATIONS, INC.- MD 240   2019-05-02   
301-533 6 Oakland MD MNRVMDMOXFX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240   2008-01-18   
301-533 7 Oakland MD FRDRMDFRXMD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 240   2008-02-13   
301-533 8 Oakland MD FRDRMDLH7MD  281E YMAX COMMUNICATIONS CORP. - MD 240   2009-03-16   
301-533 9 Oakland MD MRBGWVBUHPA  4095 FIBERNET, LLC - WV 240   2004-02-15   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.