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: BLTMMDCHDS3

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-223 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-230 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-234 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-332 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-347 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-385 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-468 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-470 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-470 0 Baltimore MD 9212 VERIZON MARYLAND, INC. 238   2005-08-19   
410-470 1 Baltimore MD 9212 VERIZON MARYLAND, INC. 238   2005-08-19   
410-470 2 Baltimore MD 9212 VERIZON MARYLAND, INC. 238   2005-08-19   
410-470 3 Baltimore MD 9212 VERIZON MARYLAND, INC. 238   2005-08-19   
410-470 4 Baltimore MD 9212 VERIZON MARYLAND, INC. 238   2005-08-19   
410-470 5 Baltimore MD 9212 VERIZON MARYLAND, INC. 238   2005-08-19   
410-470 6 Baltimore MD 9212 VERIZON MARYLAND, INC. 238   2005-08-19   
410-470 7 Baltimore MD 9212 VERIZON MARYLAND, INC. 238   2005-08-19   
410-470 8 Baltimore MD 9212 VERIZON MARYLAND, INC. 238   2005-08-19   
410-470 9 Baltimore MD 9212 VERIZON MARYLAND, INC. 238   2005-08-19   
410-539 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-547 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-576 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-625 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-659 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-727 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-752 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-783 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-837 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-895 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-986 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
443-263 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
443-423 8 Baltimore MD 9212 VERIZON MARYLAND, INC. 238   2004-06-04   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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