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: CLMAMDJTBMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
240-842 6 Washington Zone 14 (Baltimore LATA) MD 2589 US LEC OF MARYLAND, INC. 238      
410-291 6 Baltimore MD 2589 US LEC OF MARYLAND, INC. 238      
410-537 9 Baltimore MD 2589 US LEC OF MARYLAND, INC. 238      
443-213 7 Pikesville MD 2589 US LEC OF MARYLAND, INC. 238      
443-259 5 Columbia MD 2589 US LEC OF MARYLAND, INC. 238      
443-367 4 Columbia MD 2589 US LEC OF MARYLAND, INC. 238      
443-537 2 Columbia MD 2589 US LEC OF MARYLAND, INC. 238      
443-672 1 Parkton MD 2589 US LEC OF MARYLAND, INC. 238      
443-718 A Columbia MD 2589 US LEC OF MARYLAND, INC. 238      
443-718 2 Columbia MD 2589 US LEC OF MARYLAND, INC. 238      
443-718 3 Columbia MD 2589 US LEC OF MARYLAND, INC. 238      
443-718 4 Columbia MD 2589 US LEC OF MARYLAND, INC. 238      
443-718 5 Columbia MD 2589 US LEC OF MARYLAND, INC. 238      
443-766 A Columbia MD 2589 US LEC OF MARYLAND, INC. 238      
443-766 1 Columbia MD 2589 US LEC OF MARYLAND, INC. 238      
443-766 7 Columbia MD 2589 US LEC OF MARYLAND, INC. 238      
443-832 1 Columbia MD 2589 US LEC OF MARYLAND, INC. 238      
667-600 2 Baltimore MD 2589 US LEC OF MARYLAND, INC. 238      
667-600 3 Baltimore MD 2589 US LEC OF MARYLAND, INC. 238      
667-600 4 Baltimore MD 2589 US LEC OF MARYLAND, INC. 238      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

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