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: FRDRMDFRDS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
240-236 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
240-315 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
240-379 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
240-529 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
240-566 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
240-586 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
240-629 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-228 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-360 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-600 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-607 A Damascus (Hagerstown LATA) MD 9212 VERIZON MARYLAND, INC. 240      
301-619 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-620 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-624 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-631 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-644 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-662 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-663 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-668 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-682 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-694 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-695 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-696 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-698 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-815 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      
301-846 A Frederick MD 9212 VERIZON MARYLAND, INC. 240      

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

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