Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
240-223 3 Washington Zone 2 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-223 4 Washington Zone 2 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-223 5 Washington Zone 2 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-223 6 Washington Zone 2 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-223 8 Washington Zone 2 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-223 9 Washington Zone 2 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-241 5 Washington Zone 13 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2007-07-09   
240-241 6 Washington Zone 13 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2007-07-09   
240-243 A Gaithersburg MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-243 0 Gaithersburg MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-243 1 Gaithersburg MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-243 2 Gaithersburg MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-243 4 Gaithersburg MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-243 9 Gaithersburg MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-247 A Washington Zone 3 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-247 0 Washington Zone 3 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-247 1 Washington Zone 3 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-247 2 Washington Zone 3 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-247 4 Washington Zone 3 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-247 5 Washington Zone 3 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-247 6 Washington Zone 3 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-247 8 Washington Zone 3 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-247 9 Washington Zone 3 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-254 0 Hughesville MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2005-08-15   
240-254 3 Hughesville MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2005-08-15   
240-256 8 Leonardtown MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2005-08-15   
240-260 A Washington Zone 14 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-260 0 Washington Zone 14 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-260 1 Washington Zone 14 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-260 2 Washington Zone 14 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-260 4 Washington Zone 14 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-264 5 Laurel MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2006-10-27   
240-268 A Washington Zone 10 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 0 Washington Zone 10 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 1 Washington Zone 10 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 2 Washington Zone 10 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 3 Washington Zone 10 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 5 Washington Zone 10 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 6 Washington Zone 10 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 7 Washington Zone 10 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-268 8 Washington Zone 10 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-280 0 Laurel MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2004-09-15   
240-280 3 Laurel MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2008-10-01   
240-290 A Washington Zone 11 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-290 0 Washington Zone 11 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-290 1 Washington Zone 11 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-290 2 Washington Zone 11 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-290 3 Washington Zone 11 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-290 9 Washington Zone 11 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-292 7 Washington Zone 11 MD 7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2007-07-29   

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Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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