Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 410 [Rate centres in NPA 410] [Dial plan for NPA 410]

NXX: 324

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
410-324 A Towson MD TWSNMDTWDS0  9212 VERIZON MARYLAND, INC. 238      
410-324 0 Towson MD   876D ONVOY, LLC - MD 238   2024-02-19   
410-324 1 Towson MD   9212 VERIZON MARYLAND, INC. 238      
410-324 2 Towson MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-22   
410-324 3 Towson MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-22   
410-324 4 Towson MD   9212 VERIZON MARYLAND, INC. 238      
410-324 5 Towson MD   9212 VERIZON MARYLAND, INC. 238      
410-324 6 Towson MD   876D ONVOY, LLC - MD 238   2016-02-29   
410-324 7 Towson MD   876D ONVOY, LLC - MD 238   2016-03-09   
410-324 8 Towson MD   9212 VERIZON MARYLAND, INC. 238      
410-324 9 Towson MD   8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238   2015-07-17   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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