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.

Switch: CMLDMDCMEMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
223-337 A Needmore PA 547E ONVOY, LLC - PA 240      
227-226 A Frederick MD 876D ONVOY, LLC - MD 240   2024-03-30   
227-242 A Middletown MD 876D ONVOY, LLC - MD 240   2024-07-27   
227-247 A Thurmont MD 876D ONVOY, LLC - MD 240   2024-08-15   
227-253 A Frederick MD 876D ONVOY, LLC - MD 240   2024-11-17   
240-202 A Highfield MD 876D ONVOY, LLC - MD 240      
240-226 A Oakland MD 876D ONVOY, LLC - MD 240      
240-301 A Clear Spring MD 876D ONVOY, LLC - MD 240      
240-451 A Thurmont MD 876D ONVOY, LLC - MD 240      
240-655 A Kitzmiller MD 876D ONVOY, LLC - MD 240      
240-809 A Smithsburg MD 876D ONVOY, LLC - MD 240      
240-819 A Williamsport MD 876D ONVOY, LLC - MD 240      
240-822 A New Market MD 876D ONVOY, LLC - MD 240      
240-824 A Frostburg MD 876D ONVOY, LLC - MD 240      
240-827 A Lonaconing MD 876D ONVOY, LLC - MD 240      
240-831 A Frederick MD 876D ONVOY, LLC - MD 240      
240-834 A Kitzmiller MD 876D ONVOY, LLC - MD 240      
240-836 A Mount Savage MD 876D ONVOY, LLC - MD 240      
240-851 A McCoole MD 876D ONVOY, LLC - MD 240      
240-862 A Mount Savage MD 876D ONVOY, LLC - MD 240      
240-870 A Middletown MD 876D ONVOY, LLC - MD 240      
240-873 A Buckeystown MD 876D ONVOY, LLC - MD 240      
240-874 A Thurmont MD 876D ONVOY, LLC - MD 240      
240-875 A Mount Airy MD 876D ONVOY, LLC - MD 240      
240-877 A Frederick MD 876D ONVOY, LLC - MD 240      
240-908 A Walkersville MD 876D ONVOY, LLC - MD 240      
240-910 A Frederick MD 876D ONVOY, LLC - MD 240      
240-913 A Damascus (Hagerstown LATA) MD 876D ONVOY, LLC - MD 240      
240-942 A Bittinger MD 876D ONVOY, LLC - MD 240      
240-944 A Westernport MD 876D ONVOY, LLC - MD 240      
240-995 A Flintstone MD 876D ONVOY, LLC - MD 240      
681-240 A Shepherdstown WV 449F ONVOY, LLC - WV 240      
681-246 A Inwood WV 449F ONVOY, LLC - WV 240      
681-248 A Martinsburg WV 449F ONVOY, LLC - WV 240      
681-290 A Elk Garden WV 449F ONVOY, LLC - WV 240      
681-293 A Ridgeley WV 449F ONVOY, LLC - WV 240      
681-371 A Piedmont (Mineral) WV 449F ONVOY, LLC - WV 240      
681-513 A Martinsburg WV 449F ONVOY, LLC - WV 240      
681-531 A Gormania WV 449F ONVOY, LLC - WV 240   2024-06-23   
681-677 A Charles Town WV 449F ONVOY, LLC - WV 240      
681-900 A Hedgesville WV 449F ONVOY, LLC - WV 240      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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