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: BLTMMDCH1DD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-217 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-237 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-237 2 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-237 3 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-237 5 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-291 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-291 0 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-291 3 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-291 4 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-291 5 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-450 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-450 0 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-450 1 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-450 2 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-450 5 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-450 6 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-450 7 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-450 8 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-450 9 Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-481 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      
410-613 A Baltimore MD 9212 VERIZON MARYLAND, INC. 238      

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

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