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.

NPA: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

NXX: 436

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-436 A Woodlawn MD WDLWMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
443-436 0 Woodlawn MD   9212 VERIZON MARYLAND, INC. 238      
443-436 1 Woodlawn MD   9212 VERIZON MARYLAND, INC. 238      
443-436 2 Woodlawn MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-06-05   
443-436 3 Woodlawn MD   9212 VERIZON MARYLAND, INC. 238      
443-436 4 Woodlawn MD   9212 VERIZON MARYLAND, INC. 238      
443-436 5 Woodlawn MD   9212 VERIZON MARYLAND, INC. 238      
443-436 6 Woodlawn MD   9212 VERIZON MARYLAND, INC. 238      
443-436 7 Woodlawn MD   9212 VERIZON MARYLAND, INC. 238      
443-436 8 Woodlawn MD   9212 VERIZON MARYLAND, INC. 238      
443-436 9 Woodlawn MD   9212 VERIZON MARYLAND, INC. 238      

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.