Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Frederick, MD

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
301-748 8   5562 METROPCS, INC. 240      
301-748 9   5562 METROPCS, INC. 240      
301-788 A FRDRMDFRXSX  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 240      
301-815 A FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-835 A HGTWMD534MD  197D VONAGE AMERICA LLC 240      
301-835 0   197D VONAGE AMERICA LLC 240   2019-01-18   
301-835 1   876D ONVOY, LLC - MD 240   2020-11-07   
301-835 2   876D ONVOY, LLC - MD 240   2020-11-07   
301-835 3   5562 METROPCS, INC. 240   2019-11-29   
301-835 4   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 240   2019-10-16   
301-835 5   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 240   2019-03-13   
301-835 6   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 240   2019-04-11   
301-835 7   318J COMCAST IP PHONE, LLC 240   2019-03-20   
301-835 8   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 240   2019-01-19   
301-835 9   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 240   2019-10-01   
301-846 A FRDRMDFRDS1  9212 VERIZON MARYLAND, INC. 240      
301-846 0   9212 VERIZON MARYLAND, INC. 240      
301-846 1   9212 VERIZON MARYLAND, INC. 240      
301-846 2   9212 VERIZON MARYLAND, INC. 240      
301-846 3   9212 VERIZON MARYLAND, INC. 240      
301-846 4   9212 VERIZON MARYLAND, INC. 240      
301-846 5   9212 VERIZON MARYLAND, INC. 240      
301-846 6   9212 VERIZON MARYLAND, INC. 240      
301-846 7   9212 VERIZON MARYLAND, INC. 240      
301-846 8   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 240   2015-10-01   
301-846 9   9212 VERIZON MARYLAND, INC. 240      
301-898 A WLVLMDWLDS0  9212 VERIZON MARYLAND, INC. 240      
301-898 0   9212 VERIZON MARYLAND, INC. 240      
301-898 1   9212 VERIZON MARYLAND, INC. 240      
301-898 2   318J COMCAST IP PHONE, LLC 240   2008-08-20   
301-898 3   9212 VERIZON MARYLAND, INC. 240      
301-898 4   9212 VERIZON MARYLAND, INC. 240      
301-898 5   9212 VERIZON MARYLAND, INC. 240      
301-898 6   5562 METROPCS, INC. 240   2015-12-27   
301-898 7   9212 VERIZON MARYLAND, INC. 240      
301-898 8   9212 VERIZON MARYLAND, INC. 240      
301-898 9   9212 VERIZON MARYLAND, INC. 240      

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Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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