Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 240 [Rate centres in NPA 240] [Dial plan for NPA 240]

NXX: 660

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
240-660 A Washington Zone 10 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
240-660 0 Washington Zone 10 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2015-05-30   
240-660 1 Washington Zone 10 MD WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2015-10-01   
240-660 2 Washington Zone 10 MD ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2015-10-05   
240-660 3 Washington Zone 10 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-04-28   
240-660 4 Washington Zone 10 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-03-14   
240-660 5 Washington Zone 10 MD VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-03-14   
240-660 6 Washington Zone 10 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2016-02-06   
240-660 7 Washington Zone 10 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2016-02-06   
240-660 8 Washington Zone 10 MD BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2016-02-06   
240-660 9 Washington Zone 10 MD VINNVACB1MD  361H ATLANTECH ONLINE, INC. - MD 236   2015-12-26   

Last updated: Sat, 21 Mar 2026 23:53:39 UTC

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