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: CLMAMDSRRS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
410-312 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-872 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-953 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-953 0 Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-953 1 Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-953 2 Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-953 3 Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-953 4 Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-953 5 Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-953 6 Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-953 7 Columbia MD 9212 VERIZON MARYLAND, INC. 238      
410-953 8 Columbia MD 9212 VERIZON MARYLAND, INC. 238      
443-285 A Columbia MD 9212 VERIZON MARYLAND, INC. 238      
443-285 0 Columbia MD 9212 VERIZON MARYLAND, INC. 238      
443-285 4 Columbia MD 9212 VERIZON MARYLAND, INC. 238      
443-285 5 Columbia MD 9212 VERIZON MARYLAND, INC. 238      
443-285 7 Columbia MD 9212 VERIZON MARYLAND, INC. 238      
443-285 8 Columbia MD 9212 VERIZON MARYLAND, INC. 238      
443-542 4 Columbia MD 9212 VERIZON MARYLAND, INC. 238   2004-12-20   
443-542 6 Columbia MD 9212 VERIZON MARYLAND, INC. 238   2004-12-20   

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.