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: PRFRMDPFRS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
301-494 A Washington Zone 15 (Baltimore LATA) MD 9212 VERIZON MARYLAND, INC. 238      
301-494 0 Washington Zone 15 (Baltimore LATA) MD 9212 VERIZON MARYLAND, INC. 238      
410-414 A Prince Frederick MD 9212 VERIZON MARYLAND, INC. 238      
410-414 0 Prince Frederick MD 9212 VERIZON MARYLAND, INC. 238      
410-414 1 Prince Frederick MD 9212 VERIZON MARYLAND, INC. 238      
410-414 2 Prince Frederick MD 9212 VERIZON MARYLAND, INC. 238      
410-414 3 Prince Frederick MD 9212 VERIZON MARYLAND, INC. 238      
410-414 4 Prince Frederick MD 9212 VERIZON MARYLAND, INC. 238      
410-414 5 Prince Frederick MD 9212 VERIZON MARYLAND, INC. 238      
410-414 7 Prince Frederick MD 9212 VERIZON MARYLAND, INC. 238      
410-414 8 Prince Frederick MD 9212 VERIZON MARYLAND, INC. 238      
410-414 9 Prince Frederick MD 9212 VERIZON MARYLAND, INC. 238      
410-535 A Prince Frederick MD 9212 VERIZON MARYLAND, INC. 238      
443-486 4 Prince Frederick MD 9212 VERIZON MARYLAND, INC. 238   2004-07-15   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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